固溶温度对铝基复合材料组织结构和力学性能影响

固溶温度对铝基复合材料组织结构和力学性能影响

丁  寻，刘宝胜，张庆云^*，徐建成

（中国航空制造技术研究院，北京100024）

摘  要  以2009/SiC/15p颗粒增强铝基复合材料锻件作为研究对象，选取不同的固溶温度进行固溶时效处理，对试样的显微组织结构及力学性能进行观察分析。结果表明：在固溶时效状态下，2009/SiC/15p复合材料主要由Al、SiC（6H，3C）相和少量的Al₂Cu、Mg₂Si、Al₇Cu₂Fe第二相构成，其中Al₂Cu能够在高温下发生溶解，而Al₇Cu₂Fe难以溶解。随着固溶温度的升高，材料的室温拉伸性能和轴向疲劳性能均明显提高，一方面高温促进Al₂Cu相中的Cu溶入基体，引起晶格畸变，形成固溶强化，提高了材料的强度；另一方面高温增加了合金元素的固溶度，提高了材料的塑性。

关键词  铝基复合材料；固溶温度；显微组织；力学性能

中图分类号：TG113；TG115.21⁺5.3   文献标识码：A   doi:10.3969/j.issn.1000-6281.2021.01.003

Effect of solution temperature on microstructure and mechanical properties of aluminum matrix composite

DING Xun，LIU Bao-sheng，ZHANG Qing-yun*，XU Jian-cheng

(AVIC Manufacturing Technology Institute, Beijing 100024, China)

Abstract  In this research, solution treatment of 2009/SiC/15p particle reinforced aluminum matrix composite forging was carried out at different solution temperaturess. Both themicrostructure and mechanical properties were compared between different samples. Results showed that in the condition of solution treatment and aging, 2009/SiC/15p composite was made up mostly of Al、SiC (6H, 3C) phase and a few second phases of Al2Cu, Mg2Si, Al7Cu2Fe. Al2Cu could dissolve at high temperature, while Al7Cu2Fe could not. With the increase of solution temperature, the tensile property and axial fatigue property were improved obviously. On the one hand, high temperature accelerated the dissolution of Cu from Al2Cu dissolve to matrix, which leaded to solid solution strengthening effect and thus which improved the strength. On the other hand, high temperature increased the solid solubility of alloying elements, which improved the plasticity of 2009/SiC/15p.

Keywords  aluminum matrix composite；solution temperature；microstructure；mechanical property

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