Ni_(48)Co_(1)Mn_(37)In_(14-x)Al_(x)磁性记忆合金马氏体相变、力学性能和耐腐蚀性能  

Martensitic Transformation,Mechanical Properties and Corrosion Resistance of Ni_(48)Co_(1)Mn_(37)In_(14-x)Al_(x) Magnetic Shape Memory Alloys

作　　者：高丽[1] 辛向阳 刘紫莉 胡少辉 廖华玉 徐阳睿 Gao Li;Xin Xiangyang;Liu Zili;Hu Shaohui;Liao Huayu;Xu Yangrui(College of Engineering Science and Technology,Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]上海海洋大学工程学院,上海201306

出　　处：《稀有金属材料与工程》2023年第12期4021-4028,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51401122,51671126)。

摘　　要：采用电弧熔炼的材料制备方法,研究了微量的主族元素Al掺杂对Ni_(48)Co_(1)Mn_(37)In_(14-x)Al_(x)(0≤x≤2)磁性形状记忆合金显微组织、晶体结构、马氏体相变、力学性能和耐腐蚀性能的影响。结果表明:用Al替代部分In,合金的晶粒尺寸明显减小,掺杂2at%的Al元素,平均晶粒尺寸缩小到10μm左右,大约为未掺杂样品的三十五分之一;当Al掺杂量在0.25at%~2at%时,金属Al完全固溶到基体中,而且Al在合金中的固溶度随掺杂量的增加有所提升,当Al掺杂量为2at%时,Al在基体中的固溶度接近2at%;随着Al对In的取代,室温下合金由L21立方奥氏体与单斜6M马氏体的两相结构转变为单一的6M调制马氏体相结构,晶胞体积逐渐减小,马氏体相变温度呈现上升趋势;合金抗压强度不断增大,Ni_(48)Co_(1)Mn_(37)In_(12)Al_(2)的抗压缩断裂强度与Ni_(48)Co_(1)Mn_(37)In_(14)相比提高了160%,压缩应变也由5.46%增加到6.36%;适量的Al替代In后,合金在人工海水中的耐腐蚀性能总体呈现不断增强的趋势,Ni_(48)Co_(1)Mn_(37)In_(12)Al_(2)合金的耐腐蚀性能明显高于Ni_(48)Co_(1)Mn_(37)In^(14)合金,且其耐腐蚀性接近于304不锈钢。The effect of Al doping on microstructure,crystal structure,martensitic transformation,mechanical properties and corrosion resistance of Ni_(48)Co_(1)Mn_(37)In_(14-x)Al_(x)(0≤x≤2)magnetic shape memory alloys was studied by the material preparation method of arc melting.The results show that the grain size of the alloy is reduced by replacing part of In with Al,and the average grain size is reduced to about 10μm when 2at%Al element is doped,which is about 1/35 of that of the undoped sample.When the doping amount of Al is 0.25at%‒2at%,the metal Al is completely dissolved into the matrix,and the solid solubility of Al in the alloy increases with the increase in the doping amount;when the doping amount is 2at%,the solid solubility of Al in the matrix is close to 2at%.With the substitution of Al for In,the alloy changes from the two-phase structure of L21 cubic austenite and monoclinic 6M martensite to a single 6M at room temperature,the unit cell volume gradually decreases,and the martensitic transformation temperature shows an upward trend.The compressive strength of the alloy continues to increase,and compared with that of Ni_(48)Co_(1)Mn_(37)In14,the compressive fracture strength of Ni_(48)Co_(1)Mn_(37)In_(12)A_(l2) is increased by 160%,and the compressive strain also increases from 5.46%to 6.36%.After an appropriate amount of Al replacing In,the corrosion resistance of the alloy in artificial seawater generally shows an increasing trend.The corrosion resistance of Ni_(48)Co_(1)Mn_(37)In_(12)Al_(2) alloy is significantly higher than that of Ni_(48)Co_(1)Mn_(37)In_(14) alloy,and its corrosion resistance is close to that of 304 stainless steel.

关 键 词：磁性形状记忆合金 金属Al掺杂 马氏体相变 力学性能 耐腐蚀性能 

分 类 号：TG139.6[一般工业技术—材料科学与工程]