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From: cryforhelp
Date: Mon, 14 Oct 1996 02:11:36 -0700
Subject: Re: coaxing and strain aging

WVE~ol.com wrote:
>
> In a previous post, I quoted Prof. Dieter's definition of coaxing from his
> book Mechanical Metallurgy. The quoted paragraph said that metals that
> exhibited strain aging also were subject to coaxing. This begged the
> question "What is strain aging?" Quoting from the same book:
>
> "Strain aging is a type of behavior, usually associated with the >yield-point phenomenon, in which the strength of a metal is increased and >the ductility is decreased on heating at a relatively low temperature after >cold-working."
>
> There are two pages of text on strain aging. Steel is the only metal
> discussed in particular in the discussions of coaxing and strain aging.
> Strain aging occurs after the yield point. The yield point occurs when the
> metal, as it is stressed, begins to bend to the extent that it will not
> return to its original shape when the stress is removed.

Umm, not that I'm any expert, but it's my impression that ductility
changes and cold-working (tempering, strain-hardening) phenomena in
*steels* is the result of migration of carbon granules to the steel's
grain boundaries. There being no particulates, carbonaceous or
otherwise, to migrate in brass alloys I would be careful about applying
steels principles to brass reeds. Note also that strain aging by the
above definition only occurs beyond the yield point, that is beyond the
point where the metal "snaps back" into its original shape after being
stressed. In a reed this would be beyond its functional failure point
(certainly for playing a note in tune).

- --cryforhelp--

TFTD: "We are not sure of sorrow
and joy was never sure.
Today will die tomorrow
time stoops to no mans lure; and love
grown faint and fretful
with lips but half regretful sighs,
and with eyes forgetful weeps
that no loves endure."

--AC Swinburne, Garden of Proserpine