NiTi形状记忆合金中共格Ni<sub>4</sub>Ti<sub>3</sub>沉淀相生长动力学行为的相场法模拟

金属学报

2010, Vol. 46

Issue (1): 84-90

论文

本期目录 | 过刊浏览

NiTi形状记忆合金中共格Ni₄Ti₃沉淀相生长动力学行为的相场法模拟

柯常波马骁张新平

华南理工大学材料科学与工程学院; 广州 510640

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

引用本文:

柯常波马骁张新平. NiTi形状记忆合金中共格Ni₄Ti₃沉淀相生长动力学行为的相场法模拟[J]. 金属学报, 2010, 46(1): 84-90.
, . PHASE FIELD SIMULATION OF GROWTH KINETICS OF COHERENT Ni₄Ti₃ PRECIPITATE IN NiTi SHAPE MEMORY ALLOY[J]. Acta Metall Sin, 2010, 46(1): 84-90.

全文: PDF(1038 KB)

摘要:

采用基于扩散场理论的宏观相场模型对NiTi形状记忆合金中具有菱方结构的共格Ni₄Ti₃相的析出及长大过程进行了模拟研究; 沉淀相的形貌演化通过求解非守恒参量场Ginzburg-Landau控制方程和守恒浓度场Cahn-Hilliard扩散方程获得. 与二维模型相比, 本研究采用了准确的晶体学参数及改进的数学模型, 获得了更为直观及合理的三维盘状变体及二维透镜状变体; Ni₄Ti₃沉淀相的长度、宽度和面积分数随时间的变化分别遵循指数、线性和对数关系; 且其长度与宽度的比值并非恒定值, 在生长初期该比值有较大的增速而随后逐渐减慢, 能很好地解释沉淀相盘状及透镜状形貌特征形成的原因并与相关实验结果吻合.

关键词 ： NiTi形状记忆合金, 共格沉淀相, 生长动力学, 相场法, 形貌演化

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

收稿日期: 2009-06-11

ZTFLH:

TG142

基金资助:

国家自然科学基金项目50671037和50871039以及国家建设高水平大学公派研究生项目2008615024资助

作者简介: 柯常波, 男, 1981年生, 博士生

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