不同组织类型对TC21合金强-塑性的影响  

Effects of Different Microstructure Types on the Strength and Plasticity of TC21 Alloy

作　　者：邵晖[1,2] 赵永庆[2] 葛鹏[2] 周伟[2] 杨义[2] 曾卫东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2013年第4期845-848,共4页Rare Metal Materials and Engineering

基　　金：国家"973"计划(2007CB613805)

摘　　要：测试了不同冷却方式下固溶时效后3种组织类型的TC21合金室温拉伸性能,采用金相显微镜和扫描电镜对微观组织进行分析,研究了合金的室温拉伸性能与显微组织的关系。结果表明:强-塑性匹配最好(屈服强度>1000MPa)的热处理制度和组织分别为:920℃/1h,FC+550℃/4h等轴组织;920℃/1h,FC+550℃/4h网篮组织;960℃/0.5h,FC+550℃/4h片层组织。通过调整热处理工艺,控制恰当的α相体积分数、形貌、丛域尺寸及丛域内α条厚度等组织参数,可获得强-塑性匹配良好的TC21合金。The room temperature tensile properties of TC21 titanium alloy with three different microstructures were tested after solution treatment followed by different cooling. Optical microscope and scanning electron microscopy were used to observe the microstructures. Relationships between the microstructure and the tensile properties were analyzed. The result shows that the best match between the strength and the plasticity （ the yield strength1000 MPa） can be achieved when the heat treatment processes and microstructures are as following： 920 °C /1 h, FC＋550 °C/4 h equiaxed microstructure, 920 °C /1 h, FC＋550 °C /4 h basket weave microstructure, and 960 °C/0.5 h, FC＋550 °C/4 h lamellar microstructure. The better comprehensive properties could be obtained by controlling the α phase volume fraction and morphology, α phase colony size and α lamellae thickness in the colony.

关 键 词：TC21合金 Α相 丛域尺寸 强度 塑性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]