Microstructure and martensitic transformation in quaternary NiTiHfV alloy  

四元NiTiHfV合金的显微组织与马氏体相变

作　　者：Aleksandr V.SHUITCEV Yi REN Ze-zhong ZHANG Roman N.VASIN Bin SUN Li LI Yun-xiang TONG Aleksandr V.SHUITCEV;任艺;张泽中;Roman N.VASIN;孙斌;李莉;佟运祥(哈尔滨工程大学材料科学与化学工程学院黑龙江省先进纳米材料联合实验室(国际合作),哈尔滨150001;Frank Laboratory of Neutron Physics,Joint Institute for Nuclear Research,141980,Dubna,Russia;哈尔滨工程大学材料科学与化学工程学院分析测试中心,哈尔滨150001)

机构地区：[1]International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China [2]Frank Laboratory of Neutron Physics,Joint Institute for Nuclear Research,141980,Dubna,Russia [3]Center of Testing and Analysis,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第10期3282-3294,共13页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52201207,52271169)。

摘　　要：The effect of age hardening on the microstructure,martensitic transformation behavior,and shape memory properties of the(Ni_(50)Ti_(30)Hf_(20))_(95)V_(5)alloy was investigated by scanning electron microscopy,transmission electron microscopy,X-ray diffraction,differential scanning calorimetry,microhardness,and bending tests.The results demonstrate a significant influence of V addition on the microstructure of the alloy.V addition leads to the formation of a(Ni,V)_(2)(Ti,Hf)-type Laves phase,which coexists with B19'martensite at room temperature.Aging at 550℃results in precipitation hardening due to the formation of nano-scale orthorhombic H-phase,with the peak hardness observed after 3 h of aging.The alloy at peak hardness state exhibits higher transformation strain and lower unrecovered strain compared to the solution-treated sample.The aged sample achieves a maximum transformation strain of 1.56%under 500 MPa.利用扫描电子显微观察、透射电子显微观察、X射线衍射分析、差示扫描量热分析、硬度测试和弯曲测试研究了(Ni_(50)Ti_(30)Hf_(20))_(95)V_(5)合金的显微组织、马氏体相变行为与形状记忆性能。结果表明,添加V可显著影响合金的显微组织。添加V会导致合金中形成室温下与B19′马氏体相共存的(Ni,V)_(2)(Ti,Hf)型Laves相。经550℃时效处理的合金表现出析出强化行为,这主要是因为合金中形成纳米尺寸的正交结构的H相。当时效时间为3 h时,合金表现出峰值硬度。与固溶态合金相比,时效态合金表现出较大的相变应变和较小的不可恢复应变,当外加应力为500 MPa时,合金达到最大相变应变,为1.56%。

关 键 词：shape memory alloys NiTiHfV H-phase Laves phase martensitic transformation 

分 类 号：TG139.6[一般工业技术—材料科学与工程]