Failure Of WCpITi-6A1-4V Layer Prepared By Laser Melt Injection.
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V. Ocelik, J.A. Vreeling & J.T.M. De Hosson
Failure of WCp/Ti-6Al-4V layer prepared by laser melt injection V. Ocelik, J. A. Vreeling & J.Th.M. De Hosson Department of Applied Physics, Materials Science Center and Netherlands Institute for Metals Research, University of Groningen, The Netherlands. Abstract Metal Matrix Composite layers consisting of WC particles (~ 80 |im diameter) incorporated into a Ti-alloy matrix by the so-called Laser Melt Injection process were mechanically tested. Standard tensile tests as well as in-situ scanning electron microscope observations of tensile stressed surfaces were performed. Crack initiation and crack propagation processes were observed at initial and final stages of failure. Cracks initiate always in the ceramic particles. Intergranular brittle fracture of the central part of the WC particles or brittle decohesion along the WC/WzC interface form the initial failure. The crack propagates further inside the Ti matrix through brittle fracture of individual TiC dendr