| 引用本文: | 孙有平,严红革,何江美,陈刚.等径角挤压道次对SiC_p/Al复合材料显微组织的影响[J].材料科学与工艺,2011,19(3):117-121.DOI:10.11951/j.issn.1005-0299.20110323. |
| SUN You-ping,YAN Hong-ge,HE Jiang-mei,CHEN Gang.Effect of pass on microstructure and mechanical properties of SiC_p/Al composite by equal chnnel angular pressing[J].Materials Science and Technology,2011,19(3):117-121.DOI:10.11951/j.issn.1005-0299.20110323. |
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| 摘要: |
| 为改善超高强度SiCp/Al复合材料的塑性,以Bc路径对喷射沉积SiCp/7090Al(SiC颗粒体积分数15%,名义尺寸10μm)复合材料进行等径角挤压变形,研究了复合材料显微组织和力学性能的演变规律.结果表明:经过4个道次变形后,获得等轴晶粒,尺寸大约为400 nm;SiC颗粒在剪切应力作用下被破碎,尺寸约2μm;破碎的SiC颗粒间的空隙逐渐被基体填充、粘合,并在一定范围内随基体流动,提高了其分布均匀性;峰值时效处理后,复合材料的抗拉强度和屈服强度分别为770.0和575.0 MPa,弹性模量为106.6 GPa,伸长率为7.4%. |
| 关键词: 喷射沉积 复合材料 等径角挤压 显微组织 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20110323 |
| 分类号:TG376 |
| 基金项目:国家高技术研究发展计划资助项目(2009AA03Z111);教育部科学技术研究重点项目(211136);广西自然科学基金创新研究团队项目(2011GXNSFF018004) |
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| Effect of pass on microstructure and mechanical properties of SiC_p/Al composite by equal chnnel angular pressing |
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SUN You-ping, YAN Hong-ge, HE Jiang-mei, CHEN Gang
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College of Materials Science and Engineering,Hunan University,Changsha 410082,China
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| Abstract: |
| To improve the elongation of ultra-high strength SiCp/Al composite,equal channel angular pressing(ECAP) of Bc route was performed on an ultra-high strength SiCp/7090Al(the volume of SiC particles is about 15%,and the size is about 10 μm) composite,and the microstructures and mechanical properties were discussed.The results show that equiaxed grains with the average grain size of about 400 nm were obtained after four passes,and hard SiC particles were broken to 2 μm by the shear stress.Many cavities between the broken SiC fragments were filled with the matrix and they flew with the matrix in a certain range,which made the distribution of SiC in the matrix alloy homogeneous.The tensile strength,the yield strength,the modulus and the elongation of the composite after peak ageing treatment were 770.0 MPa,575.0 MPa,106.6 GPa and 7.4% respectively. |
| Key words: spray deposition composite equal chnnel angular pressing microstructure mechanical properties |
