Microstructure Transformation Mechanism and Mechanical Properties of Ti2AlNb-Based Alloy under Different Solid Solution Times AITranslate

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Chinese Library Classification Number:TG146.416[一般工业技术]

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The forged Ti₂AlNb-based alloy was taken as the research object,and the effects of solid solution time(1.5~6 h)at 950℃on the microstructure and room temperature tensile mechanical properties of the alloy were studied.The results indicate that solid solution time does not change the phase composition of the alloy.As the solid solution time increases,the average grain size of equiaxedα₂/O phase first increases and then decreases,with a more uniform distribution.The average thickness of the Rim-O phase shows an increasing trend.Under 6 h solid solution treatment,the equiaxedα₂/O phase grain shape becomes irregu-lar,and the O phase precipitates and coarsens in the B2 grain.As the solid solution time prolongs,the me-chanical properties of the alloy show a downward trend as a whole.The alloy with the solid solution time of 1.5 h has the best room temperature mechanical properties,with tensile strength of 896 MPa,yield strength of 795 MPa and elongation at break of 8.48%.