Effect of aging temperature on microstructure and friction properties of Ti-29Nb-13Ta-4.6Zr alloy

doi:10.13251/j.issn.0254-6051.2020.04.025

Abstract

Abstract: Ti-29Nb-13Ta-4.6Zr alloy ingot was prepared by vacuum melting. After solid solution treatment at 800 ℃ for 2 h, isothermal aging was carried out at 300-500 ℃ to study the microstructures and wear resistance of the alloy via aging hardening. The results show that, the alloy has a metastable undercooling near-β single-phase microstructure after solid solution treatment. After low temperature aging, the dispersed α phase appears inside the grains, however, at the temperature above 450 ℃ the α phase is no longer dispersively distributed but enriched at the grain boundaries. With the increase of aging temperature, the hardness of the alloy increases gradually and reaches the maximum of 253 HV0.3 at 500 ℃, and then decreases rapidly, while the friction coefficient also increases first then decreases with the increase of aging temperature. The comprehensive properties of the samples aged at 450 ℃ is the best, which has smaller friction coefficient and exhibits adhesive wear characteristics.

Key words: Ti-Nb-Ta-Zr alloy, aging treatment, microstructure, friction properties

CLC Number:

TG156

Liu Ran, Wang Chuanting, Gao Yuan, Wei Zhenghang, Fu Chao. Effect of aging temperature on microstructure and friction properties of Ti-29Nb-13Ta-4.6Zr alloy[J]. Heat Treatment of Metals, 2020, 45(4): 124-127.

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