Thermal stability of Ag-doped Ni-Mn-Ga high-temperature shape memory alloy

被引：0
|
作者：
Li, Jun [1 ]
Sun, Kuishan [2 ]
Yang, Yaqian [2 ]
Meng, Xianglong [3 ]
Gao, Zhiyong [3 ]
Cai, Wei [3 ]
机构：
[1] Northeast Forestry Univ, Coll Mech & Elect Engn, Harbin 150001, Peoples R China
[2] Luoyang Ship Mat Res Inst, Luoyang 471039, Peoples R China
[3] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 976卷
基金：
中国国家自然科学基金;
关键词：
Ni-Mn-Ga shape memory alloys; Microstructure; Martensitic transformation; Thermal analysis; MECHANICAL-PROPERTIES; CYCLING STABILITY; TRANSFORMATION; MICROSTRUCTURE; HYSTERESIS;
D O I：
10.1016/j.jallcom.2023.173013
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present study, the microstructure features and martensitic transformation behaviour of a Ni-Mn-Ga alloy were tailored by adjusting the Ag content. In addition, the effect of Ag content on the thermal stability was also explored. The results revealed that the non-modulated martensite phase and Ag particles coexisted in the Ni-MnGa-Ag alloys. Different martensite variants were in the {112} type I twinning relationship. With increasing Ag content, not only all transformation temperatures but also the thermal hysteresis decreased continuously in a quasilinear manner. This was attributed to the introduction of small and soft Ag particles, which were applied to release the elastic energy during the martensitic transformation. The decreasing trend of elastic energy was highly nonlinear. The alloy with 4 at% Ag addition was the percolation threshold. In addition, the relationship of energy dissipation against Ag is not monotonic. While the energy dissipation of Ni48Mn25Ga19Ag8 is almost zero, the others were much higher. Furthermore, unlike others, Ni48Mn25Ga19Ag8 featured good martensitic transformation stability upon thermal cycling.
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页数：5
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