한국주조공학회

Effect of matrix microstructure on creep behaviors of squeeze cast magnesium matrix composites was investigated. Aluminum borate whisker was used as reinforcement and AZ31, AS52 and Sr added AS52 Mg alloys were used for matrix alloys. The reinforcement was distributed homogeneously and defect-free composite was manufactured. Creep tests were carried out at the temperature of 150oC under the applied stress of 50 and 100 MPa for Mg alloys and Mg MMCs, respectively. The creep resistance of Mg MMCs was in this order: AS52-Sr > AS52 AZ31 MMCs. Void initiation during creep mainly occurred at Mg/Mg17Al12 interface and propagation went along grain boundaries. On the other hand, Mg2Si phase was not attributed to the creep void initiation.

Squeeze casting, Mg metal matrix composite, Creep properties, Void initiation.