固溶态Ti-5Mo-5V-2Cr-3Al钛合金断口形貌与塑性关系分析  

Analysis of the Relationship Between Fracture Morphologies and Plasticity of Ti-5Mo-5V-2Cr-3Al Titanium Alloy in the Solution State

作　　者：陶海明[1] 魏衍广[1] 罗峥[1] 崔雪飞[1] 陈海珊[1] 

机构地区：[1]北京有色金属研究总院粉末冶金及特种材料研究所,北京100088

出　　处：《材料导报》2014年第16期107-110,共4页Materials Reports

基　　金：中国博士后科学基金(20080440334)

摘　　要：对Ti-5Mo-5V-2Cr-3Al钛合金Φ10mm棒材在不同固溶温度下的拉伸断口形貌进行分析,并研究了断口形貌特征与力学性能之间的关系。结果表明:按照传统的断口分析理论,该材料随着固溶温度升高,塑性下降,实际测试结果却相反,该材料随固溶温度升高,在相变点以下,塑性缓慢升高,在相变点以上,塑性迅速增大;该材料的力学性能受相组成的影响,β相含量越多,棒材的拉伸强度降低,塑性升高;当固溶温度为840℃时,该材料拉伸后的宏观断口平直光滑,微观断口出现尺寸约40μm形状规则的β晶粒,棒材塑性较好。The relationships between mechanical properties and fracture morphology were studied due to the analysis of tensile fracture morphology of Φ10 mm bars of Ti-5Mo-5V-2Cr-3Al titanium alloy at certain range solution temperature. In the traditional theory of fracture analysis, when improving the solution temperature, the plasticity de- creases, however the real test results are opposite. With increasing of solution temperature, the plasticity increases slowly at the temperature below the phase transition point and rapidly at the temperature above the phase transition point. Phase composition affects the mechanical properties of the material, for example, with the increasing of the β phase content, tensile strength decreases and the plasticity increases. When the solution temperature is 840 ℃, the macroscopic morphology of fracture is flat and smooth, and there are about 40μm regular β grains in the microscopic morphology of fracture, which contributes to the plasticity of Ti-5Mo-5V-2Cr-3Al titanium alloy.

关 键 词：Ti-5Mo-5V-2Cr-3Al 钛合金 断口分析理论 固溶温度 塑性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]