Microstructure evolution and grain growth behavior of Ti14 alloy during semi-solid isothermal process  

Ti14合金半固态等温热处理过程中组织演化规律和晶粒长大行为(英文)

作　　者：陈永楠[1] 魏建锋[2] 赵永庆[3] 郑晶[3] 

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]西安交通大学金属材料国家重点实验室,西安710049 [3]西北有色金属研究院,西安710016

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第5期1018-1022,共5页中国有色金属学报（英文版）

基　　金：Projects (2005CCA06400, 2007CB613807) supported by the National Basic Research Program of China; Project (CHD2010JC115) supported by the Special Fund for Basic Scientific Research of Central Colleges,China

摘　　要：Microstructure evolution of Ti14 （α＋Ti2Cu） alloy during semi-solid isothermal process at different temperatures was investigated. The results reveal that both the temperature and holding time have effect on the grain growth behavior. The grains grow obviously and the degree of globularity increases with the increase of holding time. According to the statistic analysis of experimental data, the grain growth indices are 0.88 and 0.97 at 1 000 ℃ and 1 050 ℃, respectively, which indicates that increasing isothermal temperature would accelerate microstructural evolution.研究在1000°C和1050°C半固态温度下Ti14合金保温不同时间时微观组织的演化过程,计算在不同半固态温度下晶粒的生长指数,并分析半固态温度和保温时间对晶界和晶粒尺寸以及形态的影响规律。结果表明:随着保温时间的延长,晶粒明显长大,晶粒形态趋于圆整,晶界处液相由不连续分布转变为连续分布,最终呈网格状;1000°C和1050°C对应的晶粒生长指数分别为0.88和0.97,表明升高温度加速了微观组织的演化。

关 键 词：titanium alloy Ti14 alloy SEMI-SOLID microstructure grain growth index 

分 类 号：TG166.5[金属学及工艺—热处理]