杨西荣,王冰冰,强萌,刘晓燕,罗雷,王敬忠

• 1:西安建筑科技大学冶金工程学院

摘要(Abstract)：

为提高Ti-25Nb-3Mo-3Zr-2Sn(TLM)钛合金在模拟体液中的耐腐蚀性能，本文采用等通道转角挤压（ECAP）技术对合金进行塑性变形，利用电化学工作站、 X射线衍射仪（XRD）、扫描电镜（SEM）等研究了TLM钛合金在Hank??s模拟体液中的腐蚀行为。结果表明：ECAP变形显著提高了合金开路电位与自腐蚀电位，阻抗半径随变形道次增加而增大。利用ZimpWin软件对阻抗谱进行了等效电路拟合，表明钛合金表面钝化膜呈现典型双层结构特征。经过ECAP变形后，TLM钛合金的腐蚀坑数量明显减少，腐蚀产物以钛的氧化物为主。固溶试样主要由β相和较弱的α′相组成，ECAP变形试样出现了较多的α″相，1道次、 2道次、 4道次变形试样中的α″相体积分数分别约为37.25%, 51.27%和32.16%, α″相与β基体电位差较小，局部腐蚀倾向较低。ECAP变形后晶粒尺寸由原始的50μm细化至7.1μm(4道次变形后)，形成的高密度晶界减少了元素偏析导致的晶间腐蚀，提高了钝化膜的稳定性。生成了{332}<113>和{112}<111>孪晶和原子密度较高的（211）和（110）晶面变形织构，阻碍腐蚀扩展，促进致密钝化膜的形成。

关键词(KeyWords)： 等通道转角挤压(ECAP);Ti-25Nb-3Mo-3Zr-2Sn(TLM)钛合金;孪晶;腐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目（51474170）;; 国家基金培育专项（X20240094）;; 陕西省自然科学基金面上项目（2026JC-YBMS-0586）资助

作者(Author): 杨西荣,王冰冰,强萌,刘晓燕,罗雷,王敬忠

DOI: 10.13373/j.cnki.cjrm.XY25040019

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