Molecular dynamics study of phase transformations in NiTi shape memory alloy embedded with precipitates

被引：16

作者：

Chen, Jiayi ^{[1
]}

Huo, Dehong ^{[1
]}

Yeddu, Hemantha Kumar ^{[1
]}

机构：

[1] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

来源：

MATERIALS RESEARCH EXPRESS | 2021年 / 8卷 / 10期

关键词：

NiTi alloy; phase transformation; molecular dynamics; MARTENSITIC-TRANSFORMATION; R-PHASE; AGING TREATMENT; SIMULATION; BEHAVIOR; SUPERELASTICITY; DEFORMATION; ELASTICITY; TRANSITION;

D O I：

10.1088/2053-1591/ac2b57

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study utilizes molecular dynamics simulations to study the athermal and stress-induced martensitic transformation of B2 to B19 ' phase in a Ni-Ti alloy and the effect of precipitates on the phase transformation. The simulations demonstrate the existence of an intermediate B19 phase between martensite and austenite phases. The Nickel-Titanium shape memory alloy with precipitates is studied by introducing Ni3Ti, NiTi2 and Ni4Ti3 precipitates individually using atomistic simulations. The results show that the phase transition temperature decreases in the presence of a large volume fraction of precipitates. A blended precipitates model with Ni3Ti and NiTi2 is simulated to study the phase transformation in equiatomic NiTi alloy. The results indicate that the precipitates would initiate the emergence of the B19 phase and reduce the transition temperature. In addition, the variation of Nickel content by embedded precipitates would lead to a change in the microstructural phenomena.

引用

页数：13

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