朱凯亮，鲁雄刚，吴广新，张捷宇，李重河

( 上海大学上海市现代冶金与材料制备重点实验室，上海200072)

关键词: Cr; Mn; 低成本钛合金; 合金设计; 力学性能

中图分类号: TG146． 2 + 3 文献标识码: A

摘要: 在Ti-Al-Cr-Mn 四元系热力学优化评估的基础上［1］，利用钼当量与钛合金的力学性能的关系，设计了一种低成本α + β型钛合金Ti4． 5Al12Cr4Mn，用水冷铜坩埚成功制备．采用金相显微镜和万能试验机研究了其组织和室温力学性能，发现: Ti4． 5Al12Cr4Mn 是一种α + β型钛合金，与期望的微观组织结构一致，室温拉伸强度Ｒp0． 2 = 1196． 83 MPa，Ｒm = 1 384． 22 MPa，但塑性比较低，δs仅为5． 8%，还有待改进．

The design and preparation of the low cost α + βtype titanium alloy Ti4． 5Al12Cr4Mn

ZHU Kai-liang，LU Xiong-gang，WU Guang-xin，ZHANG Jie-yu，LI Chong-he

( Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing，Shanghai University，Shanghai 200072)

Key words: Cr; Mn; low cost titanium alloy; alloy design; mechanical properties

Abstract: The low-cost α+β type titanium alloy Ti4． 5Al12Cr4Mn，which is successfully prepared with a water-cooled copper crucible，is designed on the basis of the thermodynamic optimization of Ti-Al-Cr-Mn quaternary assessment［1］ and the relationship between molybdenum equivalent and the mechanical properties of titanium alloy． The research of its organizations and mechanical properties at room temperature using optical microscope and universal testing machine was carried out，indicating that Ti4． 5Al12Cr4Mn is an α + β-type titanium alloy，which is consistent with expectation． The room temperature tensile strength Ｒp0． 2 = 1 196． 83 MPa，Ｒm = 1 384．22 MPa，but the plastic ratio is relatively low( only 5． 8%) ，and should be improved．