刘汉源.室温复合加工及热处理对Ti53Nb组织及性能的影响[J].稀有金属材料与工程,2021,50(1):43~48.[.Effects on microstructure and mechanical properties of Ti53Nb alloy prepared by room temperature compositing process and heat treatment technology[J].Rare Metal Materials and Engineering,2021,50(1):43~48.]
室温复合加工及热处理对Ti53Nb组织及性能的影响
投稿时间:2020-04-08  修订日期:2020-04-27
中文关键词:  ECAP  旋锻  Ti53Nb  固溶处理  组织与性能
基金项目:陕西省重点项目 (Grant No. 2017ZDXM-SF-039)
中文摘要:
      采用室温ECAP+冷轧+冷旋锻复合变形方法制备了Ti-53Nb 合金棒材,通过金相显微镜、扫描电子显微镜、单向拉伸实验等研究了合金室温及热处理后组织演变以及β晶粒的长大行为,并分析了加工硬化和细晶强化效应。研究结果表明:室温抗拉强度由变形前的 380MPa,提升到了变形后的 553MPa,提高了45.53%,延伸率也在 16%以上。随固溶温度升高,β晶粒长大速率加快;晶粒尺寸对合金的强化作用满足Hall-Petch 关系式。在700℃,保温60min的条件下,组织均匀呈细小等轴状,可以获得良好的强塑性匹配。
Effects on microstructure and mechanical properties of Ti53Nb alloy prepared by room temperature compositing process and heat treatment technology
英文关键词:ECAP  Rotary swaging  Ti53Nb  Solution treatment  Microstructure and performance
英文摘要:
      The bars of Ti-53Nb alloy were prepared by room temperature Equal Channel Bending Channel Deformation (ECAP) with cold rolling and rotating and followed by forging combined deformation method. The evolutions of microstructure and b-crystal growth were systematically studied by metallographic microscope (MM), scanning electron microscope(SEM) and uniaxial tensile test after preparing process. The effects of work hardening and fine grain strengthening were analyzed with dislocation strengthening theory and Hall-Petch theory. The results show that the tensile strength increases from 380MPa to 553MPa before and after deformation and heat treatment, it shows that the preparing technology enhances significant tensile strength and elongation with the increase ratio of 45.53% and 16%, respectively. The growing speed of b-crystal is accelerated with increasing solid solution temperature, and the grain size dependence of strengthen follows Hall-Petch equation. The microstructure exhibits uniform with fine iso-axial shape by annealing at 700℃for 60 mins, which can match the requirement of strong plastic characteristics for the application.
作者单位
刘汉源 西北工业大学 
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