Atomistic study on shape memory properties of Ni-Al alloys

被引：1

作者：

Chang, I-Ling ^{[1
]}

Hsu, Chin-Chen ^{[1
]}

Chao, Ta-Hsiung ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 70101, Taiwan

来源：

JOURNAL OF MATERIALS RESEARCH | 2019年 / 34卷 / 15期

关键词：

shape memory alloy; martensite; austenite; phase transformation temperature; MOLECULAR-DYNAMICS SIMULATION; PHASE-TRANSFORMATION; MARTENSITIC TRANSFORMATIONS; TRANSITION-METALS; 2D MODEL; DEFORMATION; POTENTIALS; BEHAVIOR;

D O I：

10.1557/jmr.2019.109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The shape memory properties of Ni-Al alloy are investigated using molecular dynamics simulation. The phase transformation behaviors for various Ni composition ratios are studied under quasistatic cooling and heating process. Various loadings, i. e., uniaxial, shear, and biaxial, are applied on a 68% Ni-Al alloy till plasticity takes place. The atomic configurations are inspected and analyzed using a common neighbor parameter. The shape recovery capability of the plastically deformed alloy is examined after heating above the phase transformation temperature. It is found that there would be shape recovery if the twinning plane reorientation or moving was the major yielding mechanism. For those loadings in which stacking faults or dislocations nucleate, the deformed model would not restore to its original shape after heating and the corresponding maximum shear stress is noticeably higher. There is no direct dependence between the yield strain and the shape recovery capability. Our findings could provide a possible explanation for the functional fatigue of the polycrystalline shape memory alloy.

引用

页码：2727 / 2735

页数：9

共 29 条

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