二元Ti-Zr合金微观结构和形状记忆效应  

Microstructures and Shape Memory Effect of Binary Ti-Zr Alloys

作　　者：李岩[1,2] 姚礼[1] 崔晓龙 崔琰[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191 [2]空天先进材料与服役教育部重点实验室,北京100191 [3]深圳市飞亚达(集团)股份有限公司,广东深圳518057

出　　处：《稀有金属》2015年第8期673-679,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51371016);航空科学基金项目(2014ZF51070);深圳市战略新兴产业发展专项资金项目(CXZZ20120831145411762)资助

摘　　要：近年来,新型钛基无镍合金以其良好的生物相容性、耐腐蚀性、低弹性模量、高相变温度等特性成为了形状记忆合金领域的研究重点。采用X射线衍射(XRD)、金相光学显微镜(OM)、透射电镜(TEM)、差示扫描量热分析(DSC)、压缩应力-应变实验等方法系统研究了TixZr100-x(x=20,30,50,70,80)合金的微观组织结构、相变特性、力学性能及形状记忆效应。结果表明:二元钛锆合金是一种典型的高温形状记忆合金,室温下为具有孪晶结构的单一hcp-α'马氏体相,晶格常数和晶胞体积都会随Zr原子含量增加而增大;合金具有从β母相到hcp-α'马氏体的可逆相变,相变温度随Zr原子含量增加先降低后增大,在Zr含量50%附近,马氏体相变开始温度最低,约为520℃;合金的屈服强度随Zr原子含量增加而增大,在Zr含量50%附近达到最大值(955 MPa),然后随Zr含量增加而下降;不同成分合金均具有形状记忆效应,其中Ti70Zr30合金的记忆效应最大,为1.7%。In recent years,many researchers have focused on the novel Ti-based alloys due to the good biocompatibility,excellent corrosion resistance,low elastic modulus,high phase transformation temperature,etc. Microstructures,phase transformations,mechanical properties and shape memory effect（ SME） of TixZr100- x（ x = 20,30,50,70,80） alloys were systematically investigated by X-ray diffraction（ XRD）,optical microscopy（ OM）,transmission electron microscopy（ TEM）,differential scanning calorimetry（ DSC） and compressive stress-train measurements. The results showed that the Ti-Zr alloy was a kind of high temperature shape memory alloy composed of a single hcp-α＇ twin martensite phase at room temperature. The lattice parameters and unit-cell volume of the TiZr alloy increased with Zr content increasing. The alloys displayed a reversible phase transformation between the hcp martensite and βparent phases. The martensitic phase transformation temperature decreased with Zr content increasing and reached the minimum of about 520 ℃ when Zr content was equal to 50%. The yield strength of Ti-Zr alloy increased with Zr content increasing,to the maximum of 955 MPa at the composition of 50% Zr,and then decreased with Zr content increasing. All of the Ti-Zr alloys showed shape memory effect and the maximum value of SME was 1. 7% as displayed in Ti70Zr30 alloy.

关 键 词：形状记忆合金 钛锆 马氏体相变 微观结构 

分 类 号：TG146.23[一般工业技术—材料科学与工程]