Effect of Second-Sintering Temperature on Microstructure and Mechanical Properties of Ti₂AlNb Prepared by Spark Plasma Sintering AITranslate

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Chinese Library Classification Number:TG146.416[金属学及工艺—金属材料]

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Ti₂AlNb alloy was prepared using high-energy ball milling and spark plasma sintering(SPS).The effects of second-sintering temperature on the microstructure and mechanical properties of the alloy were investigated by X-ray diffractometer(XRD),scanning electron microscope(SEM),and universal tensile testing machine.The results show that the Ti₂AlNb alloys prepared at different second-sintering temperatures consist of B2 phase,equiaxedα₂ phase,and acicular O phase.When the second-sintering temperature is within the range of 900~950℃,the acicular O phase is precipitated as the second phase inside the B2 matrix phase,and the equiaxedα₂ phase agglomerates among the B2 matrix phase.And the equiaxedα₂ phase becomes less concentrated in its distribution and gradually decreases in its number in the range of second-sintering temperature from 1000℃to 1100℃.The Ti₂AlNb alloy prepared at the second-sintering temperature of 1000℃possesses good mechanical properties,with a room-temperature tensile strength of 309 MPa and a Vickers hardness of 466.5 HV.