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Topic: Grain Size Increase  (Read 3710 times)

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Offline Woopy

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Grain Size Increase
« on: October 11, 2013, 12:54:24 PM »
Hello,

I was wondering, does the grain size increase with temperature because the surface energy of the grains increases with temperature, and to try and reduce the energy, the grains respond by growing to reduce surface energy?
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Offline Enthalpy

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Re: Grain Size Increase
« Reply #1 on: October 11, 2013, 04:57:50 PM »
Is that about alloys? Then:

Small grains are metastable. Heat allows the natural growth to proceed. It's strictly a dynamical question, so equilibrium thoughts won't bring the answer.
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Offline Woopy

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Re: Grain Size Increase
« Reply #2 on: October 11, 2013, 06:14:24 PM »
Yes, but why does the heat increase the grain growth?
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Offline Enthalpy

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Re: Grain Size Increase
« Reply #3 on: October 12, 2013, 11:22:30 AM »
Heat hastens rearrangements - and changes in general.
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