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Isn't this the same thing as invar? I think it should be merged with that article, in any case. Uranographer (talk) 04:06, 14 October 2011 (UTC)[reply]
No. Invar has a very low coefficient of thermal expansion, its length stays very constant with temperature changes. Elinvar has a very low temperature coefficient of elasticity; its elasticity (springiness) stays very constant with temperature changes. The two metals are closely related; both are nickel-iron alloys discovered by Gillaume around the turn of the century, but they are used for different purposes. I have no objection to the proposed merger. --ChetvornoTALK 06:36, 14 October 2011 (UTC)[reply]
Although this material was available commercially very early in the 20th century, it's not clear how it was being made. Nickel, iron, and chromium all have very high melting points, and it's not clear how this alloy was being made at that time. Vernuill? EAF? VIM? How about a "History of production" section?
