Design of α-type Titanium Alloys with Improved Corrosion Resistance and Tensile Properties
Newly designed α-type titanium(α-Ti)alloys were proposed based on both electron parameters(bonding time Bo,and d-orbital energy level Mdt).The newly designed α-Ti alloy Ti-5Al-4Zr-3.6Sn,modified alloy Ti-5Al-3Sn-1.9Zr,and reference alloy Ti-5Al-2.5Sn have the same Bo,value of 3.847 and different Md,values of 2.430,2.426,and 2.422,respectively.The ultimate tensile strength(σUTS),fracture strain(εf),and hot salt corrosion resistance of the three α-Ti alloys were measured.The three α-Ti alloys were produced by the cold crucible levitation melting(CCLM)technique.Results show that homogeneous microstructures can be observed in three α-Ti alloys.The α mono-phase in three α-Ti alloys has the grain size of approximately 600 pm.σUTs and εf of Ti-5Al-4Zr-3.6Sn alloy are 801 MPa and 16％,respectively;σUTS and εf of Ti-5Al-3Sn-1.9Zr alloy are 708 MPa and 15％,respectively;σUTS and εf of Ti-5Al-2.5Sn alloy are 603 MPa and 15％,respectively.After hot salt corrosion tests were conducted for 28.8 ks,the mass loss ratio of Ti-5Al-4Zr-3.6Sn,Ti-5Al-3Sn-1.9Zr,and Ti-5Al-2.5Sn alloys is 2.61％,2.83％,and 3.10％,respectively.The results of σUTS,εp and hot salt corrosion resistance indicate that the newly designed alloy Ti-5Al-4Zr-3.6Sn has great potential for practical applications.
alloy designα-type titanium alloysCCLMtensile propertieshot salt corrosion test
马喜龙、松木一弘、尚志丰、苏宏基、贾博文、聂国权
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石家庄铁道大学材料科学与工程学院,河北石家庄 050043
广岛大学工学部,日本广岛739-8527
石家庄铁道大学机械工程学院,河北石家庄 050043
合金设计 α型钛合金 冷坩埚悬浮熔炼 拉伸性能 热盐腐蚀测试
河北省自然科学基金Project of Hebei Province Department of Human Resources and Social Security of China
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