Effect of compound field on microstructure and properties of SiCp/AZ91D magnesium matrix composites
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摘要: 在常规条件、电磁模拟微重力场、脉冲电流场和“电磁模拟微重力+脉冲电流”复合场四种外场条件下制备出SiCp含量5wt%的SiCp/AZ91D镁基复合材料，分析测试结果表明：在常规条件下，样品晶粒粗大，β-Mg17Al12相呈现出无规律的网格状结构，新生相Mg2Si以颗粒状的初生相和树枝状的共晶相存在；在电磁模拟微重力场条件下，β-Mg17Al12相细化为零散分布的短棒状和颗粒状，Mg2Si全部转化为花纹状的共晶相；在脉冲电流场条件下，β-Mg17Al12相呈现出规律分布的矩形网格状，Mg2Si以方向性明显的树枝状共晶相存在；“电磁模拟微重力+脉冲电流”复合场则兼具前述两种外场的优点，样品中的晶粒明显细化，β-Mg17Al12相呈现为颗粒状、短棒状和矩形网格状，Mg2Si转变为花纹状和树枝状的共晶组织贯穿组织晶粒，相比常规条件下的样品，其显微硬度提高了25.1%，摩擦性能提高了31%。
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关键词:
- 镁基复合材料 /
- SiCp/AZ91D /
- 微重力 /
- 脉冲电流 /
- 显微组织
Abstract: SiCp/AZ91D magnesium matrix composites were prepared under four kinds of external field conditions: normal condition, electromagnetic simulated microgravity field condition, pulse current field condition and "electromagnetic simulated microgravity + pulse current" condition. The test results indicate that: In the normal condition, the grain size of the sample is coarse, the β-Mg17Al12 phase shows an irregular grid structure, and Mg2Si exists in the granular primary phase and dendritic eutectic phase. In the electromagnetic simulation microgravity field condition, the β-Mg17Al12 phase transforms into short rods and granules, and Mg2Si is transformed into patterned eutectic phase. In the pulse current field condition, the β-Mg17Al12 phase transforms into regular distribution of rectangular grid, and Mg2Si exists in dendritic eutectic phase with obvious directivity. The "electromagnetic simulated microgravity + pulse current" condition combines the advantages of the first two kinds of external field conditions, the grain size of the sample is obviously refined, the β-Mg17Al12 phase presents granular, short rod and rectangular grid structures and the Mg2Si is transformed into the pattern and dendritic eutectic structure throughout the grain. Compared with the sample under normal condition, the microhardness is improved by 25.1% and the friction property is improved by 31%.-
Key words:
- magnesium matrix composites /
- SiCp/AZ91D /
- microgravity /
- pulse current /
- microstructure
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图 1 真空感应加热搅拌炉原理图
Figure 1. Schematic diagram of vacuum induction stirring furnace equipment
图 2 “电磁模拟微重力+电脉冲”复合场熔炼设备原理图
Figure 2. Schematic diagram of "electromagnetic simulation microgravity + electric pulse" complex field melting equipment
图 5 在不同外场条件下制备的铸态SiCp/AZ91D镁基复合材料的低倍SEM图像
Figure 5. Low magnification SEM images of the as-cast SiCp/AZ91D composites under different field conditions ((a) Normal solidification condition; (b) Electromagnetic simulation of microgravity field condition; (c) Pulsed current field condition; (d) Compound field condition)
图 6 在不同外场条件下铸态SiCp/AZ91D镁基复合材料的高倍SEM图像
Figure 6. High magnification SEM images of the as-cast SiCp/AZ91D composites under different field conditions ((a) Normal solidification condition; (b) Electromagnetic simulation of microgravity field condition; (c) Pulsed current field condition; (d) Compound field condition)
图 7 铸态SiCp/AZ91D镁基复合材料的EDS能谱图
Figure 7. EDS spectra of the as-cast SiCp/AZ91D composites
图 8 铸态SiCp/AZ91D镁基复合材料的XRD图谱
Figure 8. XRD spectra of the as-cast SiCp/AZ91D composites
图 9 SiCp/AZ91D镁基复合材料固溶处理后的金相照片
Figure 9. Metallographic photos of the SiCp/AZ91D composites after solid solution treatment((a) Normal condition; (b) Microgravity field condition; (c) Pulsed current field condition; (d) Compound field condition)
图 10 铸态SiCp/AZ91D镁基复合材料的显微硬度和摩擦性能
Figure 10. Friction coefficient and microhardness of the as-cast SiCp/AZ91D composites
图 11 铸态SiCp/AZ91D镁基复合材料的显微硬度压痕
Figure 11. Microhardness indentation of the as-cast SiCp/AZ91D composites under compound field((a) α-Mg in SiCp/AZ91D composites prepared under normal condition; (b) Mg2Si in SiCp/AZ91D composites prepared under compound field)
图 12 铸态SiCp/AZ91D镁基复合材料摩擦曲线
Figure 12. Friction curves of the as-cast SiCp/AZ91D magnesium matrix composites
表 1 AZ91D镁合金的主要成分
Table 1. Chemical composition of AZ91D alloy
Element Al Zn Mn Si Cu Mg Content/wt% 9 0.67 0.25 0.05 0.015 Balance 
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