Microstructural evolution of a PM TiAl alloy during heat treatment in α+γ phase field
来源期刊：Rare Metals2012年第5期
论文作者：SU Meike a , ZHENG Lijing a , LANG Zebao b , YAN Jie a , and ZHANG Hu a a School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing , China; b Aerospace Research Institute of Materials & Processing Technology, Beijing , China
文章页码：424 - 429
摘 要：In this study, the effect of temperatures and cooling rates of heat treatment on the microstructure of a powder metallurgy （PM） Ti-46Al-2Cr-2Nb-（B,W） （at.%） alloy was studied. Depending on the cooling rate and temperature, the different structures were obtained from the initial near-γ （NG） microstructures by heat treatment in the α+γ field. The results show that the microstructures of samples after furnace cooling （FC） consist primarily of equiaxed γ and α 2 grains, with a few grains containing lamellae. Duplex microstructures consist mainly of γ grains and lamellar colonies were obtained in the quenching into another furnace at 900°C （QFC） samples. However, further in- creasing of the cooling rate to air cooling （AC） induces the transformation of α→α2 and results in a microstructure with equiaxed γ and α2 grains, and no lamellar colonies are found.
SU Meike a , ZHENG Lijing a , LANG Zebao b , YAN Jie a , and ZHANG Hu a a School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China; b Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
摘 要：In this study, the effect of temperatures and cooling rates of heat treatment on the microstructure of a powder metallurgy （PM） Ti-46Al-2Cr-2Nb-（B,W） （at.%） alloy was studied. Depending on the cooling rate and temperature, the different structures were obtained from the initial near-γ （NG） microstructures by heat treatment in the α+γ field. The results show that the microstructures of samples after furnace cooling （FC） consist primarily of equiaxed γ and α 2 grains, with a few grains containing lamellae. Duplex microstructures consist mainly of γ grains and lamellar colonies were obtained in the quenching into another furnace at 900°C （QFC） samples. However, further in- creasing of the cooling rate to air cooling （AC） induces the transformation of α→α2 and results in a microstructure with equiaxed γ and α2 grains, and no lamellar colonies are found.
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