| 1 | Processing,microstructure and mechanical properties of bimodal size SiCp reinforced AZ31B magnesium matrix composites显示文摘The bimodal size SiC particulates(SiCp)reinforced magnesium matrix composites with different ratios of micron SiCp and nano SiCp(M-SiCp:N-SiCp=14.5:0.5,14:1,and 13.5:1.5)were prepared by semisolid stirring assisted ultrasonic vibration method.The AZ31B alloy and all as-cast SiCp/AZ31B composites were extruded at 350℃ with the ratio of 12:1.Microstructural characterization of the extruded M14+N1(M-SiCp:N-SiCp=14:1)composite revealed the uniform distribution of bimodal size SiCp and significant grain refinement.Optical Microscopy(OM)observation showed that,compared with the M14.5+N0.5(M-SiCp:N-SiCp=14.5:0.5)composite,there are more recrystallized grains in M14+N1(M-SiCp:N-SiCp=14:1)and M13.5+N1.5(M-SiCp:N-SiCp=13.5:1.5)composites,but in comparison to the M13.5+N1.5 composite,the average grain size of the M14+N1 composite is slightly decreased.The evaluation of mechanical properties indicated that the yield strength and ultimate tensile strength of the M14+N1 composite were obviously increased compared with other composites. | M.J.Shen M.F.Zhang W.F.Ying | 2015 | Journal of Magnesium and Alloys2015，3，2： | 5 |
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