PHASE FIELD SIMULATION OF GROWTH KINETICS OF COHERENT Ni4Ti3 PRECIPITATE IN NiTi SHAPE MEMORY ALLOY

Acta Metall Sin

2010, Vol. 46

Issue (1): 84-90 DOI:

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PHASE FIELD SIMULATION OF GROWTH KINETICS OF COHERENT Ni₄Ti₃ PRECIPITATE IN NiTi SHAPE MEMORY ALLOY

KE Changbo; MA Xiao; ZHANG Xinping

School of Materials Science and Engineering; South China University of Technology; Guangzhou 510640

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KE Changbo MA Xiao ZHANG Xinping. PHASE FIELD SIMULATION OF GROWTH KINETICS OF COHERENT Ni₄Ti₃ PRECIPITATE IN NiTi SHAPE MEMORY ALLOY. Acta Metall Sin, 2010, 46(1): 84-90.

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Abstract

The precipitation of metastable Ni₄Ti₃ particles and their distribution feature in Ni-rich NiTi shape memory alloys have significant influence on the subsequent martensitic transformation behavior and shape memory effect as well as superelasticity. The Ni₄Ti₃ particles with the space group R3 precipitate coherently along four {111} planes of the B2 matrix and form four pairs of conjugate variants. The diffusion-interface phase field model was used to simulate the nucleation and growth of the Ni₄Ti₃ precipitate in NiTi shape memory alloy, and its morphological evolution was characterized by solving Ginzburg-Landau equation for non-conserved field variables and Cahn-Hilliard diffusion equation for conserved field variables. More accurate crystallographic parameters and improved mathematical model were used in simulating the formations of 3D plate-shaped or 2D lenticular-shaped Ni₄Ti₃ variants. The time dependences of length, width and area fraction of Ni₄Ti₃ precipitate obey a power law, a linear and a logarithmic equation, respectively. The length-to-width ratio of the precipitate is not a constant value, but increases rapidly in the early stage of precipitation and slows down in later stage, which is corresponding to the plate- or lenticular-shaped morphologies and coincident with the experimental observations reported.

Key words: NiTi shape memory alloy coherent precipitate growth kinetics phase field method morphology evolution

Received: 11 June 2009

ZTFLH:

TG142

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Supported by National Natural Science Foundation of China (Nos.50671037 and 50871039) and the Chinese Government Graduate Student Overseas Study Program (No.2008615024)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2010/V46/I1/84

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