摘要
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。
The effects of partial substitution of Fe element for Ni element on the structure,martensitic transformation and mechanicalproperties of Ni50-xFexMn38Sn12(x=0and3%,molar fraction)ferromagnetic shape memory alloys were investigated.Experimentalresults indicate that by substitution of Fe for Ni,the microstructure and crystal structure of the alloys change at room temperature.Compared with Ni50Mn38Sn12alloy,the martensitic transformation starting temperature of Ni47Fe3Mn38Sn12alloy is decreased by32.5K.It is also found that martensitic transformation occurs over a broad temperature window from288.9to352.2K.It is found that themechanical properties of Ni-Mn-Sn alloy can be significantly improved by Fe addition.The Ni47Fe3Mn38Sn12alloy achieves amaximum compressive strength of855MPa with a fracture strain of11%.Moreover,the mechanism of the mechanical propertyimprovement is clarified.Fe doping changes the fracture type from intergranular fracture of Ni50Mn38Sn12alloy to transgranularcleavage fracture of Ni47Fe3Mn38Sn12alloys.
作者
谭昌龙
冯志成
张琨
吴明阳
田晓华
郭二军
Chang-long TAN;Zhi-cheng FENG;Kun ZHANG;Ming-yang WU;Xiao-hua TIAN;Er-jun GUO(College of Applied Science, Harbin University of Science and Technology, Harbin 150080, China;School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China;Key Laboratory of National and Local United Engineering for High-Efficiency Cutting & Tools,Harbin University of Science and Technology, Harbin 150080, China)
基金
Projects(51471064,51301054)supported of the National Natural Science Foundation of China
Project(1253-NCET-009)supported by the Program for New Century Excellent Talents,China
Project(1251G022)supported by Program for Youth Academic Backbone in Heilongjiang Provincial University,China
Project(12541138)supported by Scientific Research Fund of Heilongjiang Provincial Education Department,China
