Effect of heat treatment on microstructure and hardness of Al2O3f/Mg-6Al-0.5Nd-0.5Gd composites

doi:10.13251/j.issn.0254-6051.2020.02.039

Abstract

Abstract:

Effects of heat treatment on the microstructure and hardness of Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd composites were investigated by means of optical microscopy, scanning electron microscope and Vivtorinox hardness tester. The results show that after T4 solution treatment, β-Mg_l7A1₁₂ phase disappears completely and dissolve in the α-Mg matrix, while the phase of rare earth compounds Al₂Nd and Al₂Gd cannot be decomposed and dissolved because of their high melting point, Al₂O_3f fibers become fine and uniform, and Mg₂Si phase shows a certain tendency of decomposition and spheroidization. After aging treatment, β-Mg₁₇Al₁₂ phase precipitates again and distributes in lamellar or dispersed granular shape, which optimizes the coarse network structure in as-cast state. At this time, the hardness of the composite reaches the maximum value, which is 47.5% higher than that in as-cast state.

Key words: Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd composites, heat treatment, β-Mg₁₇Al₁₂ phase, hardness

CLC Number:

TG156

Zhang Sha, Wang Wuxiao, Sheng Qing, Du Sheng. Effect of heat treatment on microstructure and hardness of Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd composites[J]. HTM, 2020, 45(2): 202-206.

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Effect of heat treatment on microstructure and hardness of Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd composites

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