Talk:Invar

This article is just begging for a fluent Dutch/English speaker to translate the Dutch article at nl:Invar over to English. Anyone up to it? Alex.tan 17:23, 27 Apr 2005 (UTC)

No. The Dutch version is a rather dilute article, with lots of (unnecessary) details. It also lacks clear referencing, thus even picking up interesting facts from there is not straightforward.NIMSoffice (talk) 06:45, 26 April 2009 (UTC)[reply]

Isn't there something called Super-Invar also ? I wonder what that is ?

See the ext. links in the article, What is Invar? --Chetvorno^TALK 18:49, 2 December 2007 (UTC)[reply]

Super-Invar is certainly worth mentioning. It is a Ni-Fe alloy containing ~5% Co, and has a lower coefficient of expansion (0.6ppm/degC) which is maintained over a much wider range than is the case with plain Invar 36 (36%NI, ~0.5% Co).

http://www.hightempmetals.com/techdata/hitempSuperInvardata.php http://www.futurealloys.co.uk/Downloads/SUPER%20INVAR.pdf

G4OEP — Preceding unsigned comment added by 77.96.60.31 (talk) 17:44, 27 May 2014 (UTC)[reply]

The graph needs a caption --Chetvorno 14:59, 10 August 2007 (UTC)[reply]

What are "valves in motors"?Jim1138 (talk) 00:25, 16 June 2009 (UTC)[reply]

Merger Proposal[edit]

The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.

The result of this discussion was to leave the articles separate following clarification by User:Chetvorno. Haruth (talk) 20:34, 1 December 2012 (UTC)[reply]

My understanding is that Elinvar is merely a variant of Invar. Haruth (talk) 17:37, 1 December 2012 (UTC)[reply]

That's a common misconception, but they are different. Invar has a low temperature coefficient of expansion. Elinvar (has a low temperature coefficient of elasticity. Increases in temperature, in addition to causing metals to expand (get longer), increase their elasticity (flexibility). This was a problem around the turn of the century in precision chronometers, because temperature increases would cause the hairspring, which made the balance wheel oscillate back and forth, to gain elasticity, so the balance would oscillate slower and the chronometer would lose time. Guillaume invented Elinvar to solve this problem. A hairspring of Elinvar had a constant elasticity regardless of temperature. Invar and Elinvar are both nickel-iron alloys, but they have different properties --Chetvorno^TALK 19:45, 1 December 2012 (UTC)[reply]

Thanks for the clarification Chetvorno. I'll remove the merger proposal from both pages. Haruth (talk) 20:34, 1 December 2012 (UTC)[reply]

The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

External links modified (January 2018)[edit]

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Sorry, I am new to the editing process, but did Guillame invent Invar or discover it? I assume he discovered the 36% composition point and as a result invented Invar. Can someone clarify? — Preceding unsigned comment added by Yamanoor (talk • contribs) 13:11, 6 April 2019 (UTC)[reply]

Figure source[edit]

Does anyone know where the data for the CTE vs Ni% curve came from? Would love to have the numerical data for the purposes of a project. Jwjeffr (talk) 21:00, 12 June 2023 (UTC)[reply]

Recent Research[edit]

The mechanism is described in https://www.nature.com/articles/s41567-023-02142-z 152.117.104.209 (talk) 16:21, 31 July 2023 (UTC)[reply]