低Nb含量NiTiNb形状记忆合金相变及力学性能研究  

Phase Transformation Hysteresis and Mechanical Properties of NiTiNb Shape Memory Alloys with Low Nb Contents

作　　者：张子涵 李博[1] 李斗 冯振宇[1] 朱嘉锡 陈怡星 杨鲁岩 钟宏[1] 李双明[1] ZHANG Zihan;LI Bo;LI Dou;FENG Zhenyu;ZHU Jiaxi;CHEN Yixing;YANG Luyan;ZHONG Hong;LI Shuangming(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Beijing Key Laboratory of Microstructure and Property of Advanced Materials,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]西北工业大学凝固技术全国重点实验室,陕西西安710072 [2]北京工业大学材料科学与工程学院固体微结构与性能北京市重点实验室,北京100124

出　　处：《铸造技术》2025年第3期256-263,共8页Foundry Technology

基　　金：凝固技术国家重点实验室开放课题(SKLSP202404);凝固技术国家重点实验室自主研究课题(2024-TS-05)。

摘　　要：NiTiNb合金因其宽相变温度滞后特性,在管道连接件中具有重要的应用价值。基于传统高铌含量(Nb≥9%,原子分数)NiTiNb合金性能,开发低铌含量(≤3%)NiTiNb合金,在降低成本的同时维持与高铌合金相当水平的超弹性和形状记忆效应。探讨了低铌含量合金(Ni_(51)Ti_(49))_(100-x)Nb_(x)(x=0,0.5,1.5,3.0)微观组织、马氏体相变行为及力学性能。结果表明,随着合金中Nb含量增加到3.0%,马氏体相变开始温度和相变温度滞后均逐渐增加,伸长率增大,临界应力和临界应变降低。低铌合金(Ni_(51)Ti_(49))_(97)Nb_(3)表现出99.9%的应变恢复率,接近高铌合金水平,其相变温度滞后达到38.7 K,抗压强度高达1912 MPa,超过了目前所报道的多数高铌NiTiNb合金,表现出较好的应用潜力。The large phase transformation hysteresis of NiTiNb alloys renders them valuable for pipe connections.On the basis of the properties of traditional NiTiNb alloys with high Nb contents(Nb≥9 at.%),NiTiNb alloys with low Nb contents(≤3 at.%)offer a cost-effective alternative with low cost,superior superelasticity and shape memory effects.An investigation of the effects of low Nb content on the microstructure,martensitic transformation behavior and compressive mechanical properties of(Ni_(51)Ti_(49))_(100-x)Nb_(x)(x=0,0.5,1.5,3.0)alloys was carried out.The experimental results indicate that increasing the Nb content to 3.0 at.%leads to higher martensitic transformation start temperatures and phase transformation hysteresis.Additionally,the addition of Nb increases the elongation of the alloys,and a gradual decrease in both the critical stress and critical strain is observed with increasing Nb content.Moreover,the(Ni_(51)Ti_(49))_(97)Nb_(3)alloy has a high strain recovery ratio of 99.9%,which is comparable to that of NiTiNb alloys with high Nb contents.Furthermore,the(Ni_(51)Ti_(49))_(97)Nb_(3)alloy exhibits optimal compressive properties,demonstrating the highest phase transformation hysteresis of 38.7 K and a significant compressive strength of 1912 MPa,surpassing most of the previously reported NiTiNb alloys with high Nb contents and demonstrating good application potential.

关 键 词：形状记忆合金 NiTiNb合金 相变温度滞后 微观组织 力学性能 

分 类 号：TG139.6[一般工业技术—材料科学与工程]