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ductile is not really a material property but rather related to the fracture of the correct mechanics. steel will have a ductile fracture if heated enough. enough frozen gold will have brittle fracture mechanics. have you ever tried to put a rose in a bath of liquid nitrogen and then drop on the floor?
bedrupsbaneman What do you mean by ductility?
17:02, 18 October 2005 (UTC)
Gold is the most ductile metal, what is the least ductile metal?
Surely platinum is more ductile?
I am pretty sure that Indium is softer than gold. (Mohs hardness and Brinell hardness are lower). So I guess it is more ductile. The malleability is more complicated because I guess this has to do with shear hardening, but it might even be more malleable. —Preceding unsigned comment added by 84.75.180.70 ( talk) 22:23, 15 February 2011 (UTC)
--— robbiemuffin page talk 11:56, 14 April 2011 (UTC)The following list ranks metals from the greatest ductility to least: gold, silver, platinum, iron, nickel, copper, aluminium, zinc, tin, and lead.[1]
http://www.technology.matthey.com/resources/view-questions-answers/platinum-ductile-gold/
What is the difference between plasticity? If there is no difference, should these pages merge? — BenFrantzDale 21:03, 8 December 2005 (UTC)
Plasticity is also a more general term. Ductility is specifically about deformation without rupture under TENSION. Ductility is something for which you can specify a test, pick a unit, make a measurement, and get a number for. Ductility doesn't seem to have a precise universally agreed upon definition, so, at present, you do have to specify the test procedure, but usage universally recognizes that the response to TENSILE deformation is the essence, whereas plasticity is a more generic concept, not really subject to measurement.
Is there a standard system to measure ductillity?
Article seems to regard malleability as how thin a sheet can be beaten or rolled. If this accepted, can we have a table of such thicknesses ? Zinc, bismuth and arsenic apparently are "not malleable". - Rod57 ( talk) 17:18, 30 November 2019 (UTC)
This article was automatically assessed because at least one WikiProject had rated the article as stub, and the rating on other projects was brought up to Stub class. BetacommandBot 09:48, 10 November 2007 (UTC)
The image of the gold sheet shows malleability not ductility. Does anyone have an image showing ductility? Stephen B Streater ( talk) 07:38, 16 May 2008 (UTC)
Seeing as ductility and malleability are easily confused as it is, merging the articles may make be even more confusing. Stephen B Streater ( talk) 18:55, 17 May 2008 (UTC)
Not necessarily. Ductility and malleability are so closely related that they could easily be written up as though they were two aspects of one phenomenon, the ductility of metals. The the article could discuss the reasons: low slip forces, mobile dislocations etc, as well as talking about applications. Peterlewis ( talk) 19:39, 17 May 2008 (UTC)
Just to point out that this article is not just about metals. In structural geology the term ductile is used to describe any deformation of rocks to large strains that occurs without significant fracturing and brittle faulting, regardless of the deformation geometry. By all means merge the articles, just don't make the definition for ductile too narrow. Mikenorton ( talk) 20:53, 24 May 2008 (UTC)
In science class I was taught that ductility is the ability of a material to be stretched into wires, whereas malleability is the ability of a material to be shaped. The currently given definition of "a mechanical property used to describe the extent to which materials can be deformed plastically without fracture." seems to fit better with malleability. I think that the "stretched into wires" part is key for the definition. 24.83.148.131 ( talk) 15:02, 1 September 2008 (UTC)BeeCier
I checked out the source for the claim that gold is the most ductile metal, and the book clearly is ranking metals used in sculpture, NOT all metals. http://books.google.com/books?id=hW13qhOFa7gC&pg=RA1-PA129&vq=most+malleable&source=gbs_search_r&cad=1_1 How is it that gold is more malleable and ductile than any of the alkali metals? I think if this "fact" remains in the article, it should be clarified. If there is no disagreement about this, I will make the necessary change. Brittlandk ( talk) 19:15, 14 February 2009 (UTC)
There appears to be a contradiction between the statement early in the article that " lead is only malleable [not ductile]" and the placement, one screen later, of lead in the list of ten "most ductile metals" (albeit at the end). Maybe that is the complete list of metals from that source and lead, being at the end, is supposed to have zero ductility. But in that case the phrasing "most ductile metals" should be changed. Derek1G ( talk) 06:21, 2 March 2009 (UTC)
I disagree completely with the statement that lead is only malleable and not ductile. When loaded in tension, lead stretches (and necks down) prior to rupture. This is ductility. A stress strain curve for pure lead is shown here: http://books.google.ca/books?id=up5KS9fd_pkC&pg=PT804&lpg=PT804&dq=lead+stress+strain+curve&source=bl&ots=exgSmMEibw&sig=Vk5R-b6NbgU0CyZDxPE0wNofJ6I&hl=en&ei=RkrpStWQMZa9jAeFqoHHAg&sa=X&oi=book_result&ct=result&resnum=6&ved=0CCUQ6AEwBQ#v=onepage&q=lead%20stress%20strain%20curve&f=false
I recommend this statement be removed. Lead is both ductile and malleable. Quoting a reference on sculpting when the article is about materials science is not appropriate, either. —Preceding unsigned comment added by 195.220.252.125 ( talk) 08:20, 29 October 2009 (UTC)
Please, fix interwiki list. The list contains double link on the same wikis, for examle, double link to pl, de, and simple -- Dnikitin ( talk) 06:28, 13 September 2009 (UTC)
simple:Ductility
simple:Malleability
As seen in the "in other languages" box on the left. Which will it be?
77.249.229.249 (
talk) 20:10, 12 January 2010 (UTC)
What about Mercury? Is it infinitly ductile or does it come under a different sort of system because it is a liquid metal @ STP? —Preceding unsigned comment added by Cybergothiche ( talk • contribs) 15:03, 24 July 2010 (UTC)
The reference used in the wikipedia article to claim that iron is more malleable than platinum or copper is a book ("The Materials and Methods of Sculpture", description on http://books.google.fr/books?id=hW13qhOFa7gC&hl=fr , written by an ARTIST who compiles data and interprets them accordingly to his background . It is not worth much. When reading materials handbooks destined to be used by design engineers working in the industry, books such as "Materials Handbook" by McGraw-Hill, 15th edition, 2002, are much more valuable http://www.mhprofessional.com/product.php?isbn=007136076X . In the entry "platinum" for example, it is explained that platinum is more ductile than gold (hence platinum is the most ductile metal) and in the "gold" entry, it is explained that gold is the most malleable of metals.
I erased the paragraph comprising "lists" that were posted in the article, they were not reliable and contradict all the data available in engineering books. Other engineering data books would be of better use for future reference instead of "art" books.
Another book which confirms the non-validity of the art book cited before is the "CRC encyclopedia of materials parts and finishes,second edition by M.Schwartz, 2002" http://www.crcpress.com/product/isbn/9781566766616 . M.Schwartz isn't a nobody, he's the editor of the "Advanced Materials Journal". His book, in the entries "gold" and "platinum" confirms that: -gold is the most malleable metal -platinum is the most ductile metal 82.240.163.245 ( talk) 14:44, 25 December 2011 (UTC)
More: the ordered "list" of ductile metals in decreasing order, which is still on the wikipedia article for "ductility" , is the same as can be found in the book "Elements of Chemistry: theoretical and practical, Volume 2" by William Allen Miller. The problem is that this book is from ... 1864!!!! (link: http://books.google.fr/books?id=DBZDAAAAIAAJ&pg=PA318&dq=ductility+of+metals&hl=fr&sa=X&ei=TrAET5_0K4X-8gPF2Mi2AQ&ved=0CE0Q6AEwBTgK#v=onepage&q=ductility%20&f=false) Pure platinum wasn't available at the time and was still relatively hard due to it's impurities from the platinum group, nowadays, such "lists" have changed quite a lot. The element beryllium had been discovered only a few years before (in 1828). Time to uptade age old lists here on wikipedia, guys. Not that I would like beryllium to be mentioned or listed, it's very brittle, it's a simple remark to show that 1864 is a bit old as a references and many art books rely on mouth to ear "scientific" properties of materials,properties which are sometimes urban myths or thought to be true by the scientific community at the time (for example in this materials' properties book from 1864) but now proven wrong. 82.240.163.245 ( talk) 20:21, 4 January 2012 (UTC)
Repeating robbiemuffin's request for units of malleabilty and ductility to be included in this article. http://www.engineersedge.com/material_science/ductility.htm uses "Percentage of Elongation after fracture" and "Percentage reduction in Area at fracture". Is maleability "the ratio of max achievable surface area/volume"? Or more simply the thickness of the thinnest coherent stable sheet formable from the material using stamping or hammering. Also requesting the creating of 2 articles like http://en.wikipedia.org/wiki/List_of_thermal_conductivities so http://en.wikipedia.org/wiki/List_of_Maleabilities_of_Substances and http://en.wikipedia.org/wiki/List_of_Ductilitiesies_of_Substances 124.170.2.66 ( talk) 00:10, 12 February 2012 (UTC)
Is this picture really nodular cast iron? Cast iron is brittle, but nodular cast iron should have higher ductiliy.
-- Eio ( talk) 10:33, 9 January 2015 (UTC)
Hello fellow Wikipedians,
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The opening section of the article was a bit of a mess so I replaced it with a more general and cohesive summary on the subject of ductility. I thing some of the content previously included in this section (e.g. the formulas on percent elongation) is useful, but would be more suitably placed in different sections of the article.
BirdmanOfHorseradish ( talk) 23:43, 14 November 2020 (UTC)
This
level-5 vital article is rated Start-class on Wikipedia's
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ductile is not really a material property but rather related to the fracture of the correct mechanics. steel will have a ductile fracture if heated enough. enough frozen gold will have brittle fracture mechanics. have you ever tried to put a rose in a bath of liquid nitrogen and then drop on the floor?
bedrupsbaneman What do you mean by ductility?
17:02, 18 October 2005 (UTC)
Gold is the most ductile metal, what is the least ductile metal?
Surely platinum is more ductile?
I am pretty sure that Indium is softer than gold. (Mohs hardness and Brinell hardness are lower). So I guess it is more ductile. The malleability is more complicated because I guess this has to do with shear hardening, but it might even be more malleable. —Preceding unsigned comment added by 84.75.180.70 ( talk) 22:23, 15 February 2011 (UTC)
--— robbiemuffin page talk 11:56, 14 April 2011 (UTC)The following list ranks metals from the greatest ductility to least: gold, silver, platinum, iron, nickel, copper, aluminium, zinc, tin, and lead.[1]
http://www.technology.matthey.com/resources/view-questions-answers/platinum-ductile-gold/
What is the difference between plasticity? If there is no difference, should these pages merge? — BenFrantzDale 21:03, 8 December 2005 (UTC)
Plasticity is also a more general term. Ductility is specifically about deformation without rupture under TENSION. Ductility is something for which you can specify a test, pick a unit, make a measurement, and get a number for. Ductility doesn't seem to have a precise universally agreed upon definition, so, at present, you do have to specify the test procedure, but usage universally recognizes that the response to TENSILE deformation is the essence, whereas plasticity is a more generic concept, not really subject to measurement.
Is there a standard system to measure ductillity?
Article seems to regard malleability as how thin a sheet can be beaten or rolled. If this accepted, can we have a table of such thicknesses ? Zinc, bismuth and arsenic apparently are "not malleable". - Rod57 ( talk) 17:18, 30 November 2019 (UTC)
This article was automatically assessed because at least one WikiProject had rated the article as stub, and the rating on other projects was brought up to Stub class. BetacommandBot 09:48, 10 November 2007 (UTC)
The image of the gold sheet shows malleability not ductility. Does anyone have an image showing ductility? Stephen B Streater ( talk) 07:38, 16 May 2008 (UTC)
Seeing as ductility and malleability are easily confused as it is, merging the articles may make be even more confusing. Stephen B Streater ( talk) 18:55, 17 May 2008 (UTC)
Not necessarily. Ductility and malleability are so closely related that they could easily be written up as though they were two aspects of one phenomenon, the ductility of metals. The the article could discuss the reasons: low slip forces, mobile dislocations etc, as well as talking about applications. Peterlewis ( talk) 19:39, 17 May 2008 (UTC)
Just to point out that this article is not just about metals. In structural geology the term ductile is used to describe any deformation of rocks to large strains that occurs without significant fracturing and brittle faulting, regardless of the deformation geometry. By all means merge the articles, just don't make the definition for ductile too narrow. Mikenorton ( talk) 20:53, 24 May 2008 (UTC)
In science class I was taught that ductility is the ability of a material to be stretched into wires, whereas malleability is the ability of a material to be shaped. The currently given definition of "a mechanical property used to describe the extent to which materials can be deformed plastically without fracture." seems to fit better with malleability. I think that the "stretched into wires" part is key for the definition. 24.83.148.131 ( talk) 15:02, 1 September 2008 (UTC)BeeCier
I checked out the source for the claim that gold is the most ductile metal, and the book clearly is ranking metals used in sculpture, NOT all metals. http://books.google.com/books?id=hW13qhOFa7gC&pg=RA1-PA129&vq=most+malleable&source=gbs_search_r&cad=1_1 How is it that gold is more malleable and ductile than any of the alkali metals? I think if this "fact" remains in the article, it should be clarified. If there is no disagreement about this, I will make the necessary change. Brittlandk ( talk) 19:15, 14 February 2009 (UTC)
There appears to be a contradiction between the statement early in the article that " lead is only malleable [not ductile]" and the placement, one screen later, of lead in the list of ten "most ductile metals" (albeit at the end). Maybe that is the complete list of metals from that source and lead, being at the end, is supposed to have zero ductility. But in that case the phrasing "most ductile metals" should be changed. Derek1G ( talk) 06:21, 2 March 2009 (UTC)
I disagree completely with the statement that lead is only malleable and not ductile. When loaded in tension, lead stretches (and necks down) prior to rupture. This is ductility. A stress strain curve for pure lead is shown here: http://books.google.ca/books?id=up5KS9fd_pkC&pg=PT804&lpg=PT804&dq=lead+stress+strain+curve&source=bl&ots=exgSmMEibw&sig=Vk5R-b6NbgU0CyZDxPE0wNofJ6I&hl=en&ei=RkrpStWQMZa9jAeFqoHHAg&sa=X&oi=book_result&ct=result&resnum=6&ved=0CCUQ6AEwBQ#v=onepage&q=lead%20stress%20strain%20curve&f=false
I recommend this statement be removed. Lead is both ductile and malleable. Quoting a reference on sculpting when the article is about materials science is not appropriate, either. —Preceding unsigned comment added by 195.220.252.125 ( talk) 08:20, 29 October 2009 (UTC)
Please, fix interwiki list. The list contains double link on the same wikis, for examle, double link to pl, de, and simple -- Dnikitin ( talk) 06:28, 13 September 2009 (UTC)
simple:Ductility
simple:Malleability
As seen in the "in other languages" box on the left. Which will it be?
77.249.229.249 (
talk) 20:10, 12 January 2010 (UTC)
What about Mercury? Is it infinitly ductile or does it come under a different sort of system because it is a liquid metal @ STP? —Preceding unsigned comment added by Cybergothiche ( talk • contribs) 15:03, 24 July 2010 (UTC)
The reference used in the wikipedia article to claim that iron is more malleable than platinum or copper is a book ("The Materials and Methods of Sculpture", description on http://books.google.fr/books?id=hW13qhOFa7gC&hl=fr , written by an ARTIST who compiles data and interprets them accordingly to his background . It is not worth much. When reading materials handbooks destined to be used by design engineers working in the industry, books such as "Materials Handbook" by McGraw-Hill, 15th edition, 2002, are much more valuable http://www.mhprofessional.com/product.php?isbn=007136076X . In the entry "platinum" for example, it is explained that platinum is more ductile than gold (hence platinum is the most ductile metal) and in the "gold" entry, it is explained that gold is the most malleable of metals.
I erased the paragraph comprising "lists" that were posted in the article, they were not reliable and contradict all the data available in engineering books. Other engineering data books would be of better use for future reference instead of "art" books.
Another book which confirms the non-validity of the art book cited before is the "CRC encyclopedia of materials parts and finishes,second edition by M.Schwartz, 2002" http://www.crcpress.com/product/isbn/9781566766616 . M.Schwartz isn't a nobody, he's the editor of the "Advanced Materials Journal". His book, in the entries "gold" and "platinum" confirms that: -gold is the most malleable metal -platinum is the most ductile metal 82.240.163.245 ( talk) 14:44, 25 December 2011 (UTC)
More: the ordered "list" of ductile metals in decreasing order, which is still on the wikipedia article for "ductility" , is the same as can be found in the book "Elements of Chemistry: theoretical and practical, Volume 2" by William Allen Miller. The problem is that this book is from ... 1864!!!! (link: http://books.google.fr/books?id=DBZDAAAAIAAJ&pg=PA318&dq=ductility+of+metals&hl=fr&sa=X&ei=TrAET5_0K4X-8gPF2Mi2AQ&ved=0CE0Q6AEwBTgK#v=onepage&q=ductility%20&f=false) Pure platinum wasn't available at the time and was still relatively hard due to it's impurities from the platinum group, nowadays, such "lists" have changed quite a lot. The element beryllium had been discovered only a few years before (in 1828). Time to uptade age old lists here on wikipedia, guys. Not that I would like beryllium to be mentioned or listed, it's very brittle, it's a simple remark to show that 1864 is a bit old as a references and many art books rely on mouth to ear "scientific" properties of materials,properties which are sometimes urban myths or thought to be true by the scientific community at the time (for example in this materials' properties book from 1864) but now proven wrong. 82.240.163.245 ( talk) 20:21, 4 January 2012 (UTC)
Repeating robbiemuffin's request for units of malleabilty and ductility to be included in this article. http://www.engineersedge.com/material_science/ductility.htm uses "Percentage of Elongation after fracture" and "Percentage reduction in Area at fracture". Is maleability "the ratio of max achievable surface area/volume"? Or more simply the thickness of the thinnest coherent stable sheet formable from the material using stamping or hammering. Also requesting the creating of 2 articles like http://en.wikipedia.org/wiki/List_of_thermal_conductivities so http://en.wikipedia.org/wiki/List_of_Maleabilities_of_Substances and http://en.wikipedia.org/wiki/List_of_Ductilitiesies_of_Substances 124.170.2.66 ( talk) 00:10, 12 February 2012 (UTC)
Is this picture really nodular cast iron? Cast iron is brittle, but nodular cast iron should have higher ductiliy.
-- Eio ( talk) 10:33, 9 January 2015 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Ductility. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{
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).
An editor has reviewed this edit and fixed any errors that were found.
Cheers.— InternetArchiveBot ( Report bug) 11:29, 17 December 2016 (UTC)
The opening section of the article was a bit of a mess so I replaced it with a more general and cohesive summary on the subject of ductility. I thing some of the content previously included in this section (e.g. the formulas on percent elongation) is useful, but would be more suitably placed in different sections of the article.
BirdmanOfHorseradish ( talk) 23:43, 14 November 2020 (UTC)