组织对医用Ti-3Zr-2Sn-3Mo-25Nb钛合金低周疲劳行为及变形机制的影响  

Effect of Microstructure on Low Cycle Fatigue Behavior and Deformation Mechanisms of Ti-25Nb-3Mo-2Sn-3Zr Alloy for Biomedical Application

作　　者：麻西群[1] 余森[1] 程军[1] 周文昊 Ma Xiqun;Yu Sen;Cheng Jun;Zhou Wenhao(Shaanxi Key Laboratory of Biomedical Metal Materials,Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院陕西省医用金属材料重点实验室,陕西西安710016

出　　处：《稀有金属材料与工程》2023年第5期1767-1773,共7页Rare Metal Materials and Engineering

基　　金：陕西省重点研发计划(2021ZDLSF03-11);西安市科技计划(2021JH-06-0110,21XJZZ0082);国家自然科学基金(51801162,51901193);国家重点研发计划(2020YFC1107202)。

摘　　要：研究了具有2种不同组织(固溶态、时效态)的Ti-3Zr-2Sn-3Mo-25Nb(TLM)合金在室温应变控制的低周疲劳循环变形行为及微观变形机制。结果表明:TLM合金的循环硬化/软化行为与应变幅和组织密切相关。固溶态合金的低周疲劳寿命更高,且弹性模量均随循环周次和总应变幅的增大,从保持不变到急剧增加,时效态的弹性模量则在循环变形过程中基本保持不变。微观组织特征表明,固溶态合金的循环变形机制主要依赖位错滑移、变形诱发的α″马氏体和独特的“Z”型β孪晶协同作用,而时效态合金则只是以位错滑移为主。Cyclic deformation behavior and micromechanisms in strain controlled low cycle fatigue of a nearβ-Ti alloy Ti-3Zr-2Sn-3Mo-25Nb(TLM)with two different microstructures,i.e.solution treatment and aging treatment conditions,were investigated at room temperature.The results show that the cyclic hardening/softening behavior of TLM alloy is significantly correlated with strain amplitude and microstructure.The low cycle fatigue life of the alloy after the solution treatment is higher,and the elastic modulus increases sharply from constant with the increase in cycle number and total strain amplitude,while the elastic modulus of the aged alloy has little change during the cycle deformation.The microstructure characteristics show that deformation mechanism of the solid solution alloy is mainly dependent on the formation and interaction of dislocation slip,deformation-inducedαmartensites and the unique“Z”typeβtwin,while the aging alloy is mainly dependent on dislocation slip.

关 键 词：近Β钛合金 低周疲劳 弹性模量 微观机制 

分 类 号：TG146.23[一般工业技术—材料科学与工程]