| Deformation behavior of SiC particle reinforced Al matrix composites based on EMA model |
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| 作者姓名： | 程南璞 曾苏民 于文斌 刘志义 陈志谦 |
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| 作者单位： | School of Materials Science and Engineering Central South University，School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Southwest University，Changsha 410083，China School of Materials Science and Engineering，Southwest University，Chongqing 400715，China，Changsha 410083，China School of Materials Science and Engineering，Southwest University，Chongqing 400715，China Southwest Aluminium Plant，Chongqing 401326，China，Changsha 410083，China School of Materials Science and Engineering，Southwest University，Chongqing 400715，China，Changsha 410083，China，Chongqing 400715，China |
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| 摘 要： | Effects of the matrix properties,particle size distribution and interfacial matrix failure on the elastoplastic deformationbehavior in Al matrix composites reinforced by SiC particles with an average size of 5μm and volume fraction of 12%werequantitatively calculated by using the expanded effective assumption(EMA)model.The particle size distribution naturally bringsabout the variation of matrix properties and the interfacial matrix failure due to the presence of SiC particles.The theoretical resultscoincide well with those of the experiment.The current research indicates that the load transfer between matrix and reinforcements,grain refinement in matrix,and enhanced dislocation density originated from the thermal mismatch between SiC particles and Almatrix increase the flow stress of the composites,but the interfacial matrix failure is opposite.It also proves that the load transfer,grain refinement and dislocation strengthening are the main strengthening mechanisms,and the interfacial matrix failure and ductilefracture of matrix are the dominating fracture modes in the composites.The mechanical properties of the composites strongly dependon the metal matrix.
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| 关 键 词： | 铝 碳化硅 粒度分布 EMA模型 变形行为 |
| 收稿时间： | 2006-03-28 |
| 修稿时间： | 2006-10-12 |
Deformation behavior of SiC particle reinforced Al matrix composites based on EMA model |
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| CHENG Nan-pu,ZENG Su-min,YU Wen-bin,LIU Zhi-yi,CHEN Zhi-qian.Deformation behavior of SiC particle reinforced Al matrix composites based on EMA model[J].Transactions of Nonferrous Metals Society of China,2007,17(1):51-57. |
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| Authors: | CHENG Nan-pu ZENG Su-min YU Wen-bin LIU Zhi-yi CHEN Zhi-qian |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Southwest University, Chongqing 400715, China;3. Southwest Aluminium Plant, Chongqing 401326, China |
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| Abstract: | Effects of the matrix properties, particle size distribution and interfacial matrix failure on the elastoplastic deformation behavior in Al matrix composites reinforced by SiC particles with an average size of 5 βm and volume fraction of 12% were quantitatively calculated by using the expanded effective assumption(EMA) model. The particle size distribution naturally brings about the variation of matrix properties and the interfacial matrix failure due to the presence of SiC particles. The theoretical results coincide well with those of the experiment. The current research indicates that the load transfer between matrix and reinforcements, grain refinement in matrix, and enhanced dislocation density originated from the thermal mismatch between SiC particles and Al matrix increase the flow stress of the composites, but the interfacial matrix failure is opposite. It also proves that the load transfer, grain refinement and dislocation strengthening are the main strengthening mechanisms, and the interfacial matrix failure and ductile fracture of matrix are the dominating fracture modes in the composites. The mechanical properties of the composites strongly depend on the metal matrix. |
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| Keywords: | SiCp/Al composites deformation behavior EMA model |
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