Martensitic transformation and mechanical properties in an aged Ni–Mn–Ga–Ti ferromagnetic shape memory alloy
Martensitic transformation and mechanical properties in an aged Ni–Mn–Ga–Ti ferromagnetic shape memory alloy
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DOI：
10.1016/j.jallcom.2009.03.105
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发表时间：
2009-07
影响因子：
6.2
通讯作者：
Z. Gao;G. Dong;W. Cai;J. Sui;Yujie Feng;Xiangcun Li
中科院分区：
文献类型：
--
作者：
Z. Gao;G. Dong;W. Cai;J. Sui;Yujie Feng;Xiangcun Li
研究了在 873K 时效不同时间的 Ti 掺杂 Ni53Mn23.5Ga18.5Ti5 合金中的马氏体转变行为和力学性能。结果表明，随着时效时间的延长，Ni3Ti相的体积分数增加，基体中Ni含量减少，导致马氏体转变温度降低。 Ni3Ti颗粒的析出强化了基体，导致断裂韧性增加。断口形貌观察表明，断裂类型从沿晶脆性断裂转变为沿晶和穿晶延性破坏的混合，是力学性能提高的原因。
The martensitic transformation behavior and mechanical properties were investigated in a Ti-doped Ni53Mn23.5Ga18.5Ti5alloy aged at 873K for different durations. It is shown that the volume fraction of the Ni3Ti phase increases and the Ni content in the matrix reduces with increasing aging time, resulting in the decrease of the martensitic transformation temperatures. The precipitation of Ni3Ti particles strengthens the matrix, resulting in the increasing in the fracture toughness. Fracture morphology observation shows the fracture type changing from intergranular brittleness fracture to a mixture of intergranular and transgranular ductile failure is responsible for the improved mechanical properties.