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| 高体分SiCp /Al复合材料热变形行为及组织的研究 |
| The Research of Hot-deformation Behavior and Microstructure of SiCp/Al Composite with High Volume Fraction |
| Received:April 16, 2009 Revised:July 10, 2009 |
| DOI： |
| 中文关键词: SiCp/Al复合材料 热压缩 本构方程 组织 |
| 英文关键词: SiCp/Al composites hot deformation constitutive relation microstructure |
| 基金项目:国家高技术（863）项目（2007AA03Z544） |
| Author Name | Affiliation | | ZENG Li | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China | | REN Xue-ping | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China | | WANG Xiao-li | Beijing Jianlong Steel Holdings Co., Ltd, Beijing 100070, China | | CUI Yan | National Key Laboratory of Advanced Composites, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| 中文摘要: |
| 在应变速率为0.0005~0.01 s-1、变形温度为700~900 ℃条件下，对高体积分数SiC颗粒增强Al基复合材料进行了高温压缩实验，研究了复合材料高温压缩流变应力，观察了复合材料压缩后的组织形貌。结果表明：SiCp/Al复合材料在热压缩变形中发生了伪塑性变形，流变应力随应变速率的增加而增加，随变形温度的增加而降低；通过线性回归分析计算了复合材料的应变指数n以及变形激活能Q，获得了材料高温条件下的流变应力本构方程；高温压缩后的复合材料，颗粒尺寸、圆整度及分布均匀性明显提高。 |
| 英文摘要: |
| Hot compression on the composite was tested at strain rates range from 0.0005 s-1 to 0.01s-1, deformation temperatures from 700 ℃ to 900 ℃, the flow stress behavior was researched, microstructure and properties of composite were observed and measured. The results show that: SiCp/Al composite with high volume fraction showed Pseudo-plastic deformation during hot compression, the flow stress increased with raising strain rates, decreased with raising deformation temperatures; strain exponent n and deformation activation energy Q were calculated in term of linear regression analysis, flow stress constitutive equation was got on hot compression conditions; the size, roundness and distribution uniformity of SiC particle increased obviously after hot compression. |
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