稀土Y对Ti-Ni-Cu记忆合金组织与超弹性的影响  

Effect of Rare Earth Y on Microstructure and Superelasticity of Ti-Ni-Cu Memory Alloy

作　　者：赵光伟[1,2] 李达 徐国雄 方东 黄才华 叶永盛[1,2] 石增敏 ZHAO Guang-wei;LI Da;XU Guoxiong;FANG Dong;HUANG Cai-hua;YE Yong-sheng;SHI Zeng-min(Hubei Engineering Research Center for Graphite Additive Manufacturing Technology and Equipment,China Three GorgesUniversity,Yichang 443002,Hubei,China;College of Me-chanical and Power Engineering,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学石墨增材制造技术与装备湖北省工程研究中心,湖北宜昌443002 [2]三峡大学机械与动力学院,湖北宜昌443002

出　　处：《铸造》2022年第8期956-961,共6页Foundry

基　　金：湖北省教育厅科学技术研究计划项目(B2020024);石墨增材制造技术与装备湖北省工程研究中心(三峡大学)开放基金项目(HRCGAM202104)。

摘　　要：采用真空电弧熔炼制备了Ti-Ni-Cu-Y铸态记忆合金,通过SEM、循环压缩等测试研究了稀土Y的含量对Ti-44Ni-6Cu记忆合金组织与性能的影响。结果表明,随着Y元素的增加,合金组织中的Y-Cu与富Y化合物相逐渐增多且晶粒尺寸变大。在一定成分范围内,Y元素的添加增强了Ti-44Ni-6Cu合金的力学性能,其中0.6Y合金的压缩强度达到3223 MPa,1.0Y合金的断裂应变达到46.5%,2.0Y合金的屈服强度提高34%。稀土Y的添加改善了Ti-44Ni-6Cu合金的可回复与超弹性应变,其中2.0Y合金可回复与超弹性应变分别达到4.95%、2.75%,与0Y合金相比分别提高了1.87倍和459倍。在经过20次预应变为7%的循环压缩后,2.0Y合金几乎完全回复,超弹性及其记忆性能趋向于稳定。Ti-Ni-Cu-Y as cast memory alloys were prepared by vacuum arc melting. The effects of rare earth Y on the microstructure and properties of the Ti-44Ni-6Cu memory alloy were investigated by SEM and cyclic compression. The results showed that Y-Cu and Y-rich compounds gradually increased and the grain size became larger with the increase of the Y element. In a certain composition range, the addition of the Y element enhanced the mechanical properties of the Ti-44Ni-6Cu alloy. The compression strength of the 0.6Y alloy reached 3 223 MPa, the fracture strain of the 1.0Y alloy reached 46.5%, and the martensitic yield strength of the 2.0Y alloy increased by 34%. The addition of the Y element also improved the recoverable strain and superelasticity of the Ti-44Ni-6Cu alloy. The recoverable strain and superelasticity strain of the 2.0Y alloy reached 4.95% and 2.75%, respectively, which were 1.87 and 4.59 times higher than those of the 0Y alloy.After 20 times cyclic compression with 7% pre-strain, the 2.0Y alloy almost completely recovered, the superelasticity and shape memory properties tended to be stable.

关 键 词：形状记忆合金 超弹性 Ti-Ni-Cu-Y 循环压缩 

分 类 号：TG146.2[一般工业技术—材料科学与工程]