摘要: |
利用金相、X射线衍射、透射电镜及万能拉伸试验机等测试手段,研究了TC11钛合金热旋压成形的组织、物相、微观结构和力学性能。结果表明,热旋压变形后,TC11钛合金的洛氏硬度提高了27%,强度达到了1200MPa;热旋后TC11钛合金组织呈纤维状,α-Ti相晶粒折优取向由(101)晶面向(002)晶面转变,β相被次生α相隔断,呈不连续形貌,β转组织有小长宽比的α柱条,次生α相及颗粒物弥散分布在TC11钛合金的基体组织中。热旋压变形后的这种微观组织结构,使TC11钛合金在宏观上表现出强度和塑性良好的综合力学性能。 |
关键词: 热旋压;TC11钛合金;显微组织;力学性能 |
基金项目: |
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Study on Microstructure and Mechanical Properties of Hot-spinning TC11 Titanium Alloy |
Sun Haiquan Ni Linyu Zhu Xiaobing Xiao Xiaoqing Wang Xuefeng
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Shanghai Space Propulsion Technology Research Institute, Shanghai 201109
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Abstract: |
The microstructure and mechanical properties of TC11 titanium alloy after hot-spinning are investigated by optical microscope, X-Ray diffraction, transmission electronic microscope and tensile testing machine. The results show that the hardness of TC11 titanium alloy increases 27%, the strength reaches 1200MPa, the grains are stretched with the axial feed direction and are staved along with the radial direction, and the optimal orientation of α-Ti organization transfers from (101) crystal indices to (002) after hot-spinning deformation. SEM and TEM observed that β-Ti is separated by secondary α-Ti, showing a discontinuous morphology, and small length-width ratio α-Ti column existed in β-Ti shift organization. The secondary α-Ti and particles are dispersed in the TC11 titanium alloy matrix organization, and the microstructure makes the strength and plasticity of TC11 titanium alloy a good comprehensive performance in macroscopic. |
Key words: hot-spinning deformation;TC11 titanium alloy;microstructure;mechanical properties |