Effect of annealing temperature on microstructure and properties of Al-Ti toughened CrCoNi medium-entropy alloy

doi:10.13251/j.issn.0254-6051.2024.01.022

Abstract

Abstract: By electron backscattering diffraction (EBSD) and Vickers hardness test, the microstructure evolution low and hardness change of Al-Ti toughened medium-entropy alloy annealed at different temperatures were studied. The results show that when the annealing temperature is higher (1100 ℃), the density of annealed twins is higher, the twin morphology is more straight and regular. The relationship of recrystallization and grain growth and annealing temperature is not simple linear. When the annealing temperature exceeds the critical temperature, the processes of recrystallization and grain growth are accelerated obviously. When annealed at 1100 ℃ for 1 h, the equiaxial grains with average size of 20.89 μm are obtained, and the hardness of the alloy decreases to 302.9 HV0.2 due to the stress release.

Key words: medium-entropy alloy, annealed twin, grain size, recrystallization, hardness

CLC Number:

TG156.21

Xu Shuanghui, He Guoai. Effect of annealing temperature on microstructure and properties of Al-Ti toughened CrCoNi medium-entropy alloy[J]. Heat Treatment of Metals, 2024, 49(1): 142-147.

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