张弈,李传维,李克,顾剑锋

• 1:上海交通大学上海市激光制造与材料改性重点实验室
• 2:中国航发南方工业有限公司
• 3:上海交通大学材料科学与工程学院材料改性与数值模拟研究所

摘要(Abstract)：

采用直接激光沉积(DLD)技术制备了Ti-6Al-4V合金，使用X射线衍射、扫描电镜、拉伸实验机等研究了不同能量密度(50、62.5和75 J/mm~3)对DLD成型Ti-6Al-4V合金显微组织和力学性能的影响。结果表明：随着能量密度的升高，可以得到3种典型的显微组织：α′马氏体组织、魏氏组织、层片状(α+β)组织。在能量密度为75 J/mm~3时，DLD成型Ti-6Al-4V合金具有较好的强塑性匹配：屈服强度达到1199 MPa,抗拉强度达到1220 MPa,断裂伸长率为11.6%。该合金强度和塑性提升的原因可能与层片状(α+β)组织中的纳米孪晶有关。

关键词(KeyWords)： Ti-6Al-4V合金;直接激光沉积;能量密度;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(52171042)

作者(Author): 张弈,李传维,李克,顾剑锋

DOI: 10.13289/j.issn.1009-6264.2022-0575

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