热处理对Al2O3f/Mg-6Al-0.5Nd-0.5Gd复合材料组织及硬度的影响

doi:10.13251/j.issn.0254-6051.2020.02.039

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 202-206.DOI: 10.13251/j.issn.0254-6051.2020.02.039

热处理对Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd复合材料组织及硬度的影响

张莎¹, 王武孝², 申情², 杜胜¹

1. 陕西能源职业技术学院机电与信息工程学院, 陕西咸阳 712000;
2. 西安理工大学材料科学与工程学院, 陕西西安 710048

收稿日期:2019-07-12 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 王武孝,副教授,博士,E-mail:wangwuxiao@163.com
作者简介:张莎(1987—),女,讲师,硕士,主要从事金属材料研究,发表论文8篇,E-mail:414100271@qq.com。

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

Zhang Sha¹, Wang Wuxiao², Sheng Qing², Du Sheng¹

1. Department of Electronic Engineering and Inpormation, Shaanxi Energy Institute, Xianyang Shaanxi 712000, China;
2. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an Shaanxi 710048, China

Received:2019-07-12 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

采用金相显微镜、维氏硬度测试仪及扫描电镜等,研究热处理工艺对Al₂O_3f /Mg-6Al-0.5Nd-0.5Gd复合材料微观组织及硬度的影响。结果表明,固溶处理后β-Mg_l7A1₁₂相大部分固溶于α-Mg基体中,而稀土化合物Al₂Nd、Al₂Gd相因其高熔点,在试验温度下不能分解与固溶,Al₂O_3f纤维变得细小均匀,Mg₂Si相呈一定的分解、球化趋势。时效处理使β-Mg_l7A1₁₂相再次析出,呈层片状或弥散颗粒状分布,优化了其铸态时粗大的网状结构,此时,复合材料硬度达到最大值,比铸态时提高了47.5%。

关键词: Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd复合材料, 热处理, β-Mg₁₇Al₁₂相, 硬度

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

中图分类号:

TG156

张莎, 王武孝, 申情, 杜胜. 热处理对Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd复合材料组织及硬度的影响[J]. 金属热处理, 2020, 45(2): 202-206.

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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热处理对Al₂O_3f/Mg-6Al-0.5Nd-0.5Gd复合材料组织及硬度的影响

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

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