ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Ripening and rearrangements of precipitates under mechanochemical coupling

Date: 28.09.2016
Place: MSE 2016: Materials Science and Engineering Congress, Darmstadt, Germany

Reza Darvishi Kamachali
Christian Schwarze
Ingo Steinbach

The coupling between chemical and mechanical fields developing around secondary-phase particles may influence their evolution path as well as their collective features in the matrix. We study the effect of concentration dependency of stiffness as demonstrated recently [1,2] on the growth and ripening of ?’ precipitates in supersaturated aluminium-lithium alloy. Mesoscale phase-field simulations are performed to take cross-coupling of composition and stress fields into account. Kinetics and statistical analysis show that the growth generally slows down at the presence of elasticity. The mechanochemical coupling modifies the overall kinetics of the ripening. Special arrangements of precipitates and inverse ripening are observed under this effect. [1] R. Darvishi Kamachali, E. Borukhovich, N. Hatcher and I Steinbach; "DFT-supported phase-field study on the effect of mechanically driven fluxes in Ni4 Ti3 precipitation"; MSMSE 22 (2014) 034003. [2] R. Darvishi Kamachali, E. Borukhovich, O. Shchyglo and I. Steinbach; “Solutal gradients in strained equilibrium”; Phil. Mag. Let. 93 (2014) 680.

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