Study On Microstructure And Wear Resistance Of TiC_p/AZ91 Magnesium Matrix Composites

Magnesium alloys were one of preferred materials for widespread use in transportation, communication and aerospace industries, due to its light weight, high efficiency, saving energy and environmental protection. Although magnesium alloys have many excellent and unique properties, such as high specific strength and modulus, high heat and electrical conductivity, good damping and shock absorption and excellent electromagnetic shielding capability, it is difficult for magnesium alloys to meet the work condition requiring high strength at elevated temperatures, high elastic modulus, good corrosion resistance and good wear resistance. Therefore, the exploiture and development of particulate reinforced magnesium matrix composites with excellent properties is of great theory significance and practicality.According to the morphological feature of reinforcement, magnesium MMCs can be grouped under two heads, i.e. fiber (long and short fiber, whisker) and particulate reinforced magnesium matrix composites. Although the properties of fiber reinforced magnesium MMCs is higher than those of particulate reinforced composites, their great application is limited, owing to the limitation in the complexity and high cost of fabrication processing, and directional properties. On the contrary, particulate reinforced magnesium matrix composites have been receiving considerable attention because of low cost of the reinforcement, uniform microstructure, isotropic properties and processing using the traditional metal processing techniques. The reinforcing particulates are introduced by ex situ and in situ methods. Although good properties are achieved in the magnesium matrix...