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| 预氧化温度对纳米SiC颗粒增强镁基复合材料组织及性能的影响 |
| Effects of Pre-oxidation Temperature on Microstructure and Properties of Nano SiC Particle Reinforced Magnesium Matrix Composites |
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| DOI：10.3969/j.issn.1674-6457.2023.04.010 |
| 中文关键词: 纳米SiC颗粒 预氧化温度 SiCp/AS81复合材料 显微组织 力学性能 |
| 英文关键词: nano SiC particles pre-oxidation temperature SiCp/AS81 composite microstructure mechanical property |
| 基金项目:河南省科技厅科技攻关项目(202102310030) |
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| 中文摘要: |
| 目的 研究预氧化处理对纳米SiC颗粒增强的SiCp/AS81(Mg−8Al−Sn)复合材料显微组织和力学性能的影响，分析其作用机理，最终得到适宜的SiC预氧化温度。方法 采用粉末冶金法制备纳米SiC颗粒增强的SiCp/AS81(Mg−8Al−Sn)复合材料，采用相关仪器设备，对不同温度预氧化处理后的SiC颗粒、AS81和0.50%−SiCp/AS81复合材料物相进行分析，观察其显微组织，并对相关力学性能进行测试。结果 当对SiC颗粒进行不同温度预氧化处理后，SiC颗粒逐渐钝化，并在预氧化温度达到785 ℃及以上时，SiC外表层逐渐被SiO2包覆且在985 ℃时完成完全包覆;AS81复合材料和不同温度预氧化处理的0.5%−SiCp/AS81复合材料的物相组成都主要为Mg和Mg17Al12，785 ℃及以上温度预氧化处理后的0.5%−SiCp/AS81复合材料中的Si元素都呈均匀分布;0.5%−SiCp/AS81复合材料的硬度、屈服强度、抗拉强度和断后伸长率都高于AS81复合材料，且随着预氧化温度的升高，0.5%−SiCp/AS81复合材料的显微硬度、抗拉强度和屈服强度先增大后减小，在预氧化温度为885 ℃时取得最大值。结论 预氧化温度为885 ℃时，SiC颗粒外包覆的SiO2可以增强与AS81的界面结合力，有助于提升0.5%−SiCp/AS81复合材料的强塑性，0.5%−SiCp/AS81复合材料适宜的SiC预氧化温度为885 ℃。 |
| 英文摘要: |
| The work aims to studythe effects of pre-oxidation treatment on microstructure and mechanical properties of nano SiC particle reinforced SiCp/AS81 (Mg-8Al-Sn) composites, and to analyze its action mechanism, and finally obtain an appropriate pre-oxidation temperature for SiC. Nanometer SiC particle reinforced SiCp/AS81 (Mg-8Al-Sn) composites were prepared through the powder metallurgy method. The phases of SiC particles, AS81, and 0.50%-SiCp/AS81 composites after pre-oxidation treatment at different temperature were analyzed, their microstructures were observed, and relevant mechanical properties were tested. The results showed that the SiC particles were passivated gradually after pre-oxidation treatment at different temperature. When the pre-oxidation temperature reached 785 ℃ or above, the SiC outer layer was gradually coated by SiO2 and was completely coated at 985 ℃; The phase compositions of AS81 composites and 0.5%-SiCp/AS81 composites pretreated at different temperature were mainly Mg and Mg17Al12, and the Si elements in 0.5%-SiCp/AS81 composites pretreated at 785 ℃ or above were evenly distributed; the hardness, yield strength, tensile strength and elongation of 0.5%-SiCp/AS81 composites were higher than those of AS81 composites. With the increase of the pre-oxidation temperature, the microhardness, tensile strength and yield strength of 0.5%-SiCp/AS81 composites first increased and then decreased, and reached the maximum when the pre-oxidation temperature was 885 ℃. When the pre-oxidation temperature is 885 ℃, the interfacial adhesion with AS81 of SiO2 coated with SiC particles can be enhanced, which helps to improve the strength and plasticity of 0.5%-SiCp/AS81 composites. The appropriate pre-oxidation temperature for 0.5%-SiCp/AS81 composites is 885 ℃. |
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