Microstructure and mechanical properties of (TiB+La_2O_3)/Ti composites heat treated at different temperatures  

热处理温度对(TiB+La_2O_3)/Ti复合材料的显微组织和力学性能的影响(英文)

作　　者：郭相龙[1] 王立强[1] 覃继宁[1] 吕维洁[1] 张获[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第6期1737-1743,共7页中国有色金属学报（英文版）

基　　金：Project (2012CB619600) supported by the National Basic Research Program of China;Project (51371114) supported by the National Natural Science Foundation of China;Project (12XD1402800) supported by Excellent Academic Leaders Program of Shanghai,China

摘　　要：Near-α titanium matrix composites reinforced with TiB and La2O3 were synthesized by common casting and hot-working technology.The effects of β heat treatment temperature on the microstructure and the tensile properties of the in situ synthesized（TiB＋La2O3）/Ti were studied.Microstructure was studied by OM and TEM,and tensile tests were carried out at room temperature and 923 K,respectively.Results show that with the increase of β heat treatment temperature,prior β phase grain size increases and αcolony size decreases.Room temperature tensile strength increases with the increase of β heat treatment temperature,which can be attributed to the decrease of α colony size with the increase of β heat treatment temperature.However,high-temperature tensile strength decreases with the increase of β heat treatment temperature and the decrease of the high-temperature tensile strength is due to the increase of the prior β phase grain size.采用熔铸法制备TiB短纤维和La_2O_3颗粒混杂增强的近a型钛基复合材料,并采用合适的热加工工艺将.其加工成板材。研究β热处理温度对原位自生(TiB+La_2O_3)/Ti复合材料的微观组织和力学性能的影响规律。采用OM和TEM研究钛基复合材料的微观组织,同时测试钛基复合材料的室温以及高温(923 K)拉伸性能。结果表明:随着β热处理温度的升高,原始β晶粒尺寸增大但是α集束的尺寸变小;室温拉伸强度随着β热处理温度的升高而提高,这主要是因为α集束尺寸随着β热处理温度的升高而降低;而高温拉伸强度则随着β热处理温度的升高而降低,这主要是由于原始β晶粒随着β热处理温度的升高而增大。

关 键 词：titanium matrix composites microstructure mechanical properties 

分 类 号：TB333[一般工业技术—材料科学与工程]