Abstract: Aluminum matrix composites have shown great potential as a new generation of engineering materials. Reinforcing particles have higher mechanical properties than the matrix aluminum alloy, acting as load bearing agents under stress, while the matrix maintains a good ductility. However, ex-situ particles form weak bonding with the matrix easily, leading to premature failure. To overcome the problem, in-situ particles have been introduced for a clean matrix/reinforcement interface and strong matrix/reinforcement interfacial bonding and therefore superior properties of the composites. The formation of in-situ TiB2, Al3Ti, and TiC is discussed, focusing on their thermal dynamic stabilities and interfacial bonding with the aluminum matrix. Their reinforcing effects is also discussed in relation to the microstructures of the composites.
Authors: Siming Ma, Corey Vian, Aoke Jiang, and Xiaoming Wang
Keywords: Aluminum matrix composites, in-situ fabrication, mechanical properties