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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 3    No. 4    December 1993

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EFFECT OF HOMOGENIZATION PROCESSING ON MICROSTRUCTURE AND PROPERTIES OF Ti-34Al-2Mn ALLOY
Lei  Changming ; Qu  Xuanhui;  Huang  Baiyun;  Xiong  Xiang

Powder Metallurgy Research Institute; Central South University of Technology; Changsha 410083; China

Abstract:A γ-TiAl base alloy with the composition of Ti-34Al-2Mn(wt--%)was prepared by consum- able electrode arc-melting technique.The effect of homogenization processing following arc-melt- ing on its microstructure and mechanical properties was investigated.The emphases were placed on the microstructural evolution during solidification and homogenization,and the relationship be- tween microstructure and ductility.It has been determined that the samples annealed at 900℃ for 20 h exhibit the best ductility compared with those treated at other temperatures up to 1 100℃,and they have a mixed structure of equiaxed grain of γ-TiAl single phase and some prima- ry lamellar grains which include three types of interfaces,i.e.,α2/γ,/γ/γ_S,γ/γ_T,maintaining specific orientaion relationships between both sides.The ductility improvement is believed to be as- sociated with existence of suitable amount of α2-Ti3Al phase and the refinement of grains ob- tained at 900℃.

 

Key words: Ti-34Al-2Mn Alloy; homogenization; microstructure; properties

ISSN 1672-7029
CN 43-1423/U

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