| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 91 === This work is to investigate the effects of the forms of reinforcement, particle size, contents and process parameters of Al alloy 6061 composites on mechanical properties and wear resistance performance. The microstructure and the micrographs of wear surface of specimens are observed and analyzed by OM, SEM and EDS.
This experimental results show that there is an optimal content of fine particle reinforcement in powder sintering 6061 aluminium alloy composites. As the optimal content of reinforcement is reached, it could effectively accommodate in the porosities between the particles of matrix, causing the hardness and wear resistance performance of specimens reach the optimal status. During the wear process, the fine particle reinforcement would be removed due to the plastic deformation of matrix if overload；it would be pulled out or brittle fracture and detach form the matrix due to the coarse particle reinforcement. Moreover, the wear resistance performance of coarse particle reinforcement is superior to that of fine particle reinforcement when B4C is used as the reinforcement in the Al alloy 6061 composites.
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