The Simulation of Stress-Induced Phase Transition of L1₀ Re-Precipitation Based on Microscopic Phase-Field Model

Abstract:

It is common that the pre-precipitation phase with kinetics advantage is found during non-equilibrium transformation. The continuously changed stress in the transformation increases the complication of precipitation process. The stress induces Ll₀ pre-precipitation phase in Ni₇₅-Al_12.5-V_12.5 alloy is studied by microscope phase-field model in this paper. It is particularly show that Ll₂ phase precipitates directly without stress. There is no Ll₀ phase to be found in the disordered matrix. Oppositely, Ll₀ phase precipitates firstly with stress, and then it turns into Ll₂ phase. When stress is less, either or both above situations are observed. While stress is stronger, a large range of Ll₀ phase precipitates firstly. Then a part of it dissolves. The rest turns into Ll₂ phase. The precipitation of pre-precipitation phase accelerates the precipitation process. The larger the stress and the more Ll₀ phase precipitation, the longer it exists and the shorter the induction period is.

• Periodical: Materials Science Forum (Volume 689)
• Pages: 226-234
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.689.226
• Online since: June 2011
• Authors: Yong Xin Wang, Yong Biao Wang, Zheng Chen, Yan Li Lu
• Keywords: Ll₀ Pre-Precipitation Phase, Microscope Phase-Field Model, Ni-Al-V Alloy, Stress Induced

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