2010•The Chinese Journal of Nonferrous MetalsRequires access
Effect of heat treatment on microstructure and tensile properties of cast Ti-23Al-17Nb alloy
Shiqiong Li
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Abstract
The cast alloy was insulated at 1 000 and 1 020℃for 3 h and then air-cooled.The effect of heat treatment temperature on the microstructure and tensile properties of cast Ti-23Al-17Nb(mole fraction,%) alloy were investigated. The results show that the macrostructure of the cast alloy is equiaxed grain.The lathα_2 phase precipitated in the alloy exhibits a fine basket weave Widmanstatten microstructure.After heat treatment,theα_2 phase precipitates more than the cast alloy,and theα_2 phase in boundary is disconnected.With the increase of temperature,the quantity of theα_2 phase decreases,but its width increases.Heat treatment can improve the tensile strength and elongation of the alloy.After heat treatment at 1 020℃for 3 h,AC,the elongation of sample reaches 4%.The tensile fracture consists of intergranular fracture and cleavage fracture.