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在Ni_(50-x)Fe_xMn_(38)Sn_(12)x=0,3%,摩尔分数)铁磁形状记忆合金中,通过Fe元素掺杂部分替代Ni元素,对其结构、马氏体相变以及力学性能的影响进行研究。结果表明,在室温附近通过Fe替代Ni,改变了合金的微观组织以及晶体结构,同时马氏体相变温度下降了32.5 K。马氏体相变所跨越的温度区间为288.9～352.2 K。研究发现,通过掺杂Fe元素可以显著提高Ni-Mn-Sn合金的力学性能。Ni_(47)Fe_3Mn_(38)Sn_(12)合金在11%断裂应变时展现出最大的压缩强度855 MPa。另外,揭示了改善力学性能的机制。通过掺杂Fe元素改变了Ni_(50)Mn_(38)Sn_(12)合金晶粒间的断裂方式,使其从沿晶断裂转变为Ni_(47)Fe_3Mn_(38)Sn_(12)合金的穿晶解理断裂。
In Ni_ (50-x) Fe_xMn_ (38) Sn_ (12) x = 0,3%, the molar fraction) ferromagnetic shape memory alloy, Change and mechanical properties of the impact of research. The results show that the substitution of Fe for Ni at room temperature changes the microstructure and crystal structure of the alloy, and the martensitic transformation temperature decreases by 32.5K. Martensite phase transition across the temperature range of 288.9 ~ 352.2 K. The results show that the mechanical properties of Ni-Mn-Sn alloy can be significantly improved by doping Fe. The Ni_ (47) Fe_3Mn_ (38) Sn_ (12) alloy exhibits the maximum compressive strength of 855 MPa at 11% fracture strain. In addition, mechanisms to improve mechanical properties are revealed. The intergranular fracture mode of Ni_ (50) Mn_ (38) Sn_ (12) alloy was changed by doping Fe element, and the intergranular fracture was changed into Ni_ (47) Fe_3Mn_ (38) Sn_ (12) Crystal cleavage fracture.