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Fabrication of Dense Ti-Al-based Alloy by Spark Plasma Sintering

Xin Lu, He Xinbo, Xuanhui Qu, Shiqiong Li

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Abstract

Ti-Al alloys from prealloyed powder of Ti-47.5Al-2.5V-1.0Cr were prepared by spark plasma sintering(SPS).The results show that Ti-Al-based alloy with higher density and uniform microstructure is obtained by SPS at sintering temperature of 1100℃ or above.However,the microstructures of the alloy change with the sintering temperature variation.While sintered at 1100℃ and 1150℃,they consist of equiaxed(γ) and lamellar(α_(2)+γ) grains;sintered at 1200℃,they are of fully lamellar microstructure.The alloys sintered at 1100℃ with fine duplex microstructure exhibit better compressive properties at room temperature,with the compressive strength of 3321 MPa and the compression ratio of 35.2%.

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What this paper is about

Ti-Al alloys from prealloyed powder of Ti-47.5Al-2.5V-1.0Cr were prepared by spark plasma sintering(SPS).The results show that Ti-Al-based alloy with higher density and uniform microstructure is obtained by SPS at sintering temperature of 1100℃ or above.However,the microstructures of the alloy change with the sintering temperature variation.While sintered at 1100℃ and 1150℃,they consist of equiaxed(γ) and lamellar(α_(2)+γ) grains;sintered at 1200℃,they are of fully lamellar microstructure.The alloys sintered at 1100℃ with fine duplex microstructure exhibit better compressive properties at room temperature,with the compressive strength of 3321 MPa and the compression ratio of 35.2%.

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Available abstract

Ti-Al alloys from prealloyed powder of Ti-47.5Al-2.5V-1.0Cr were prepared by spark plasma sintering(SPS).The results show that Ti-Al-based alloy with higher density and uniform microstructure is obtained by SPS at sintering temperature of 1100℃ or above.However,the microstructures of the alloy change with the sintering temperature variation.While sintered at 1100℃ and 1150℃,they consist of equiaxed(γ) and lamellar(α_(2)+γ) grains;sintered at 1200℃,they are of fully lamellar microstructure.The alloys sintered at 1100℃ with fine duplex microstructure exhibit better compressive properties at room temperature,with the compressive strength of 3321 MPa and the compression ratio of 35.2%.

Key concepts: Materials science, Spark plasma sintering, Microstructure, Equiaxed crystals, Lamellar structure, Alloy, Sintering, Metallurgy

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