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《The Chinese Journal of Nonferrous Metals》 2012-02
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Effects of high-pressure torsion pressure on microstructure and mechanical property of SiC_p-Al composites

LI Xiao,LI Ping,XUE Ke-min,WANG Cheng (School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)  
SiC particles and Al powder mixtures(SiCp-Al composites) were successfully fabricated into the metal matrix composites by high-pressure torsion(HPT).The effects of pressure on the microstructure and mechanical properties of the composites were investigated by optical telescope,microhardness-testing device,universal testing machine and scanning electronic telescope.The results show that higher pressure is more helpful to the strain accumulation during the power forming of SiCp-Al composites.In the HPT process,the higher the pressure is,the better the powerful densification is,the higher the accumulated strain is,and the more homogeneous of the SiC particles are,while the increase of microhardness is not so high.When the pressure increases from 0.5 GPa to 0.62 GPa,the yield strength increases by 32.6%,while the tensile strength and elongation decrease by 4% and 25.5%,respectively.The fracture surface of the dimples shows various sizes as the main feature.
【Fund】: 国家自然科学基金资助项目(51175138);; 高等学校博士学科点专项基金资助项目(20100111110003);; 安徽省优秀青年科技基金项目资助(10040606Y21)
【CateGory Index】: TB331
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