Effect of Ni substitution for Ga on the polycrystalline Ni–Mn–Ga–Gd high-temperature shape memory alloys
Effect of Ni substitution for Ga on the polycrystalline Ni–Mn–Ga–Gd high-temperature shape memory alloys
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DOI：
10.1016/j.jallcom.2012.12.157
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发表时间：
2013-04
影响因子：
6.2
通讯作者：
Xin Zhang;J. Sui;Xiaohang Zheng;Zheyi Yang;X. Tian;W. Cai
中科院分区：
文献类型：
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作者：
Xin Zhang;J. Sui;Xiaohang Zheng;Zheyi Yang;X. Tian;W. Cai
Ni53 + xMn25Ga21.9 − xGd0.1（at. %）（x = 0 - 5）合金，用Ga代替Ni提高相变温度。采用XRD、SEM、TEM和DSC研究了多晶Ni53 + xMn25Ga21.9 − xGd0.1合金的显微组织和相变。结果表明，Ni53 + xMn25Ga21. 9 − xGd 0. 1合金基体为四方马氏体相，Ni58Mn25Ga16. 9Gd 0. 1合金基体形成面心立方γ相。随着Ni含量的增加，相变温度逐渐升高。当Ni含量小于57at. %时，合金的压缩断裂强度和压缩断裂应变随Gd含量的增加先增加后减小。韧性γ相的产生使Ni58Mn25Ga16.9Gd0.1合金的压缩断裂强度和应变分别提高到2327MPa和51.7%。当预应变为10%时，Ni53 + xMn25Ga21.9-xGd0.1（x = 0 - 3）合金获得完全回复。
Ni53+xMn25Ga21.9−xGd0.1(at.%) (x=0–5) alloys had been obtained by substituting Ga for Ni to increase transformation temperature. The microstructure and phase transformation of polycrystalline Ni53+xMn25Ga21.9−xGd0.1alloys had been investigated by XRD, SEM, TEM and DSC. The results showed that the matrix of Ni53+xMn25Ga21.9−xGd0.1alloys were tetragonal martensite phase, and the face-centered cubic γ phase was formed in Ni58Mn25Ga16.9Gd0.1alloy. The transformation temperatures rose gradually with the increase of Ni content. The compressive fracture strength and strain firstly increased then decreased with the increase of Gd content when Ni content was less than 57at.%. The generation of ductile γ phase improved the compressive fracture strength and strain of Ni58Mn25Ga16.9Gd0.1alloy up to 2327MPa and 51.7%, respectively. The complete recovery was obtained in Ni53+xMn25Ga21.9−xGd0.1(x=0–3) alloys when the pre-strain was 10%.