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Will grain size affect the roughness of surface?

Not usually, unless some chemical or mechanical effect affects the grain boundaries differently than the bulk. Plating or dissolution tend to produce facets, which are larger for larger crystals, while intergranular fracture (due to bad heat treatment) exposes internal facets. Also, some wear processes are affected indirectly by grain size. --Joel 21:21, 6 September 2005 (UTC)

Proposed merge from grains[edit]

The grains article is start on the same topic as this article. It seems like a no-brainer to merge the two. --Wizard191 (talk) 02:29, 7 October 2008 (UTC)

Seemingly conflicting information re. grains vs. crystallites[edit]

Metallurgists often refer to crystallites as "grains".

and then later

the grains are larger than crystallites and are formed by several of them. --Ott0 (talk) 13:36, 12 August 2010 (UTC)
I removed the second statement, because I couldn't find any reliable sources that stated the two are different. I did find lots of references that said they are the same though. Wizard191 (talk) 17:28, 12 August 2010 (UTC)

I see the same problem elsewhere: Crystal size (or grain size) is usually measured from X-ray diffraction patterns and grain size by other experimental techniques like transmission electron microscopy. So what is the difference between "crystal size" and "grain size" that leads to them being measured differently? Is the "or" in "crystal size (or grain size)" really an "and" or is it the kind of pedagogical appositive "or" that serves as a definition of the second term? Not myself knowing the difference between a crystal and a grain (despite having given a lecture on "grains" 2 days ago at a conference), I hesitate to correct this from its current muddiness into crystal-clear wrongness. (talk) 12:06, 12 July 2014 (UTC)

a particle can be an aglomerate of several grains, and grains can be polycristalline and so formed by several crystallite. read it on for instance (the second answer is way better than the top one) That's strange such a basic and common misunderstanding is still on Wikipedia! (talk) 13:48, 25 August 2014 (UTC)

Merge from Polycrystal[edit]

Polycrystal should be merged into Crystallite because 'polycrystal' is defined from 'crystallite' but not the other way around. Blackbombchu (talk) 00:29, 26 October 2014 (UTC)

I merged the two articles. Copy-editing still needed. Also, lead should compare to amorphous and single-crystalline structures. -- Rfassbind (talk) 16:03, 27 October 2014 (UTC)

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