Experimental and numerical analysis of mechanical and fatigue behavior of magnesium alloy AZ61 with micro-SiC particles

• Main Authors: MURUGAN SUBRAMANI, 慕如甘
• Other Authors: Song-Jeng Huang
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/bxb592

碩士 === 國立臺灣科技大學 === 機械工程系 === 106 === In the present work, the mechanical properties and fatigue behaviors of AZ61 magnesium alloy reinforced with different weight percentages (0, 1 and 2) of micro-SiCp and fabricated by gravity casting method using the stirring process were investigated. Homogenization (T4) heat treatment was conducted to increase the ductility of the materials. From the microstructure observation, it was found that adding SiCp into the magnesium matrix significantly decreased the grain size of the matrix of the composites. The presence of SiCp was used to enhance the hardness value of metal matrix composites (MMCs). Furthermore, the addition of SiCp increased the ultimate tensile strength (UTS) and yield tensile strength (YTS) of the MMCs. The uniformly distributed SiCp and its interaction with the AZ61 matrix dislocations was the major source of increased strength in MMCs. From the fatigue test results, pure AZ61 samples were having significantly high fatigue life compare to the SiCp reinforced MMCs whilst increasing SiCp content into the AZ61 matrix decreased the fatigue life of AZ61/SiCp MMCs significantly. The obtained tensile test and fatigue test experimental results were compared with finite element simulation results and it showed good correlations with the experimental results.