Grain growth behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy during isothermal β heat treatments  

作　　者：De-Lai Ouyang Hai-Ming Du Xia Cui Shi-Qiang Lu Xian-Juan Dong 

机构地区：[1]School of Materials Science and Engineering, Nanchang Hangkong University [2]Department of Environmental Art Design,Jiangxi Normal University [3]School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University

出　　处：《Rare Metals》2019年第3期233-237,共5页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 51261020);the Aeronautical Science Foundation of China(No. 2014ZE56015);the Educational Committee of Jiangxi Province of China(No. GJJ14505)

摘　　要：Isothermal β heat treatments of Ti-6.5 Al-3.5 Mo-1.5 Zr-0.3 Si alloy were performed at the temperature of1040-1240 ℃ to examine the influence of heating conditions on grain growth of the alloy. The results show that the grain size increases with heating temperature and holding time increasing. Rapid β grain growth of the alloy takes place at the temperature of over 1140 ℃. The grain growth kinetics for the alloy follows the classical isothermal grain growth law.The growth time exponent(n) of 0.5651 and activation energy(Q) of 129.6 kJ mol-1 are determined. Finally, in order to determine the grain size under different heating conditions,the grain growth model of the alloy was established.Isothermal β heat treatments of Ti-6.5 Al-3.5 Mo-1.5 Zr-0.3 Si alloy were performed at the temperature of1040-1240 ℃ to examine the influence of heating conditions on grain growth of the alloy. The results show that the grain size increases with heating temperature and holding time increasing. Rapid β grain growth of the alloy takes place at the temperature of over 1140 ℃. The grain growth kinetics for the alloy follows the classical isothermal grain growth law.The growth time exponent(n) of 0.5651 and activation energy(Q) of 129.6 kJ mol-1 are determined. Finally, in order to determine the grain size under different heating conditions,the grain growth model of the alloy was established.

关 键 词：ISOTHERMAL heating Ti-6.5Al-3.5Mo-1.5Zr-0.3Si ALLOY GRAIN growth Model 

分 类 号：V261.3[航空宇航科学与技术—航空宇航制造工程] V252[一般工业技术—材料科学与工程]