Effect of Heat Treatment on the Microstructure and Property of TiAl Alloys Prepared by Gas Atomization Powders
Powder metallurgical TiAl alloy was fabricated by gas atomization powders,and the effect of heat treatment temperature on the microstructure evolution and room tensile properties of PM TiAl alloy was investigated.The uniform fine duplex microstructure was formed in PM TiAl based alloy after being heat treated at 1250℃/2h followed by furnace cooling(FC)+ 900℃/6h(FC).When the first step heat treatment temperature was improved to 1360℃/1h,the near lamellar microstructure was achieved.The ductility of the alloy after heat treatment improved markedly to 1.2% and 0.6%,but the tensile strength decreased to 570MPa and 600MPa compared to 655MPa of as-HIP TiAl alloy.Post heat treatment at the higher temperature in the alpha plus gamma field would regenerate thermally induced porosity (TIP).
Powder metallurgy TiAl alloy Heat treatment Microstructure Mechanical property
Na Liu Zhou Li Guoqing Zhang Hua Yuan Wenyong Xu Zhengjiang Gao
Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials, Beijing 100095, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
497-501
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）