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Microstructure, Phase Transformation and Mechanical Property of NiMnGa/Sn Composites
Liu, Jinyang Xiao, Shifa Artem, Chernov Tong, Yunxiang Li, Li Tian, Bing
Liu, Jinyang
Xiao, Shifa
Artem, Chernov
Tong, Yunxiang
Li, Li
Tian, Bing
Date
2024-11
Advisor
Type
Article
Degree
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Chapter 6.pdf
Adobe PDF, 1.6 MB
Description
Abstract
This paper proposes to prepare NiMnGa/Sn composites by compositing NiMnGa particles and Sn powder. The microstructure, martensitic transformation and mechanical properties of the bulk alloy, ball-milled powders and composites were systematically investigated. The results show that the milled NiMnGa particles are mainly flaky in shape, and the alloy transforms from ordered to disordered structure after ball milling. The martensitic transformation of milled NiMnGa particles disappeared and it is recovered by post-annealing. The annealed NiMnGa particles and Sn powder were mixed and sintered to make NiMnGa particles /Sn composites. The composites exhibit a different NiMnGa particle distribution morphology for the axial direction and radial direction of the sample. The interfacial reaction between the NiMnGa particles and Sn matrix is observed. The martensitic transformation of the 30% and 40% composites has been observed, but the transformation temperatures for the composites are higher than that of the annealed NiMnGa particles, which should be related to the interfacial reaction that changes the composition of the NiMnGa particles. Most of the composites are not fractured during compressive test irrespective of the particles distribution and show a large plasticity, the mechanical strength of the composites increases with increasing the NiMnGa particle content.