Chemical Forums

Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: Woopy on October 11, 2013, 12:54:24 PM

Title: Grain Size Increase
Post by: Woopy 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?

Title: Re: Grain Size Increase
Post by: Enthalpy 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.

Title: Re: Grain Size Increase
Post by: Woopy on October 11, 2013, 06:14:24 PM

Yes, but why does the heat increase the grain growth?

Title: Re: Grain Size Increase
Post by: Enthalpy on October 12, 2013, 11:22:30 AM

Heat hastens rearrangements - and changes in general.