shield time and shield distance

Exchange about the physics background, diffuse interface theory, etc..
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Jane
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shield time and shield distance

Post by Jane » Sun Jul 24, 2022 4:21 pm

Hi,everyone,

Can you explain the physical meaning of shielding time and shielding distance?

Thank you.

Bernd
Posts: 1438
Joined: Mon Jun 23, 2008 9:29 pm

Re: shield time and shield distance

Post by Bernd » Mon Jul 25, 2022 3:21 pm

Dear Jane,

When nucleation happens, the latent heat of phase transformation will locally heat up the material, so that for a certain time there will be no further nucleation happen up to a certain distance around this seed.

The use of a shield distance and shield time in the nucleation input is a pragmatic approach which resembles this behavior in simulations which do not explicitly include latent heat release and heat diffusion. Practically, it allows for adjusting nucleation parameter such as to realize a given density of precipitates (which may be known from experiments).

Bernd

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