Aging has something to do with a change in the properties of certain metals and alloys that occurs at ambient or moderately elevated temperatures after a

 

(1) hot-working operation or a heat-treatment - quench aging in ferrous alloys, natural or artificial aging in ferrous and nonferrous alloys; or

(2) after a cold-working operation - strain aging.

Due to a phase change or precipitation, the change in certain metal's or alloy's properties is often, but not always; but a change in the chemical composition of the metal or alloy is never involved.

-see also:
"Aging" is in the UNSPSC Code "73181304"
  Aging or stabilizing services

Ref: 120671/2006-09-23


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