Unusual Microstructures and Strength Characteristics of Cu/Ti3AlC2 Cermets
Cu/Ti3AlC2 cermets prepared by pressless sintering a mixture of Ti3AlC2 and copper powders were investigated. It was found that the Cu/Ti3AlC2 possesses an unusual microstructure made up of sub-micro-sheet layered Ti3C2 and Cu-Al alloy within one Ti3AlC2 particulate. The fracture strength measured by the three-point-bending manner is increased but the deformation rate is reduced with increase in the volume content of Ti3AlC2 from 30 % to 90 %. The highest fracture strength reached to as higher as 983.9 MPa, corresponding to an extreme strain of 2.64 %. The fracture in mode was changed from brittle to ductile with reduce in the content of Ti3AlC2. The higher fracture strength can be attributed to a stronger interface bond between Ti3AlC2 and Cu-Al phase. A significant network feature formed by the Cu-Al alloy surrounding Ti3AlC2 particulates was observed from the fracture face.
Wei Pan and Jianghong Gong
H. X. Zhai, M. X. Ai, Z. Y. Huang, Y. Zhou, S. B. Li, Z. L. Zhang, "Unusual Microstructures and Strength Characteristics of Cu/Ti3AlC2 Cermets", Key Engineering Materials, Vols. 336-338, pp. 1394-1396, 2007