phase transformation

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Mohamed Aymen Ben Hassen

Mohamed Aymen Ben Hassen

December 17, 2012 3:24pm UTC

phase transformation

hi everyone,
I'm looking to modelize a phase transformation in the Titanium alloy ti-6AL-4V during the course of the beta-phase to alpha-phase. I'm not sure if Comsol can do that or not. If the response is yes, how many module should I use ? and is it difficult to make this example in Comsol ? and, the most inportant question, witch version of comsol should I use ?
Thx in advance

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Ivar Kjelberg

Ivar Kjelberg

December 17, 2012 3:57pm UTC in response to Mohamed Aymen Ben Hassen

Re: phase transformation

Hi

I would say yes it's possible if you tweak a little the system., as by default you have only one phase, check the boiling water examples and the level set or phase set methods

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Good luck
Ivar

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Mohamed Aymen Ben Hassen

Mohamed Aymen Ben Hassen

December 17, 2012 4:15pm UTC in response to Ivar Kjelberg

Re: phase transformation

Thank you Ivar,

Yes, by default Ihave only one phase 'beta', but during cooling a new phase 'alpha' appears at the grain boundary within the metastable 'beta-phase' and this followed by the growth of this nucleus into the surrounding matrix. In another words, an interface is created during the nucleation stage and then migrates inti the surrounding parent phase 'beta' during the growth stage by the transfer of atoms across the interface.

Can you please explein to me what should I do exactly ? I'think I need to use the second Fix's low, no ?

thx in advance.

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Ivar Kjelberg

Ivar Kjelberg

December 18, 2012 8:12am UTC in response to Mohamed Aymen Ben Hassen

Re: phase transformation

Hi

this is not something I have done myself, so I have only non-verified ideas (I'm fighting partly with some similar issues on SMA (shape memory alloy simulation) for SMA under vibration load with phase transformation.

you need a variable that drives the phase change, for my case I use T the temperature and define a heat capacity with "bumps" to integrate the latent heat over a few degrees, and use this T value to drive material properties as conductance, (electric and heat) stiffness, expansion coefficient etc.

But from what I hear you have not only T temperature but probably also "t" time to look after, hysteresis issues are tricky, and there I do not really have any good ideas ;)

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Good luck
Ivar

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Yevgeniy Davletshin

Yevgeniy Davletshin

January 8, 2013 7:19pm UTC in response to Ivar Kjelberg

Re: phase transformation

Would it work if you couple Phase Change and Boiling Water models?

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