Author(s)

V. Ocelík, S. Nijman, R. van Ingen, U. Oliveira & J.Th.M. De Hosson

Abstract

Laser melt injection of hard ceramic particles into A1 and Ti alloys - processing, microstructure and mechanical behaviour V. Ocelik, S. Nijman, R. van Ingen, U. Oliveira & J.Th.M. De Hosson Department of Applied Physics, Materials Science Center and Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands Abstract The conditions for a successful Laser Melt Injection (LMI) of Sic and WC particles into the melt pool of Al8Si and Ti6Al4V alloys were studied experimentally and theoretically by FEM calculations. The laser employed is a high power Ncl:YAG . The formation of a relatively thick aluminium oxide layer on the A1 melt surface was confirmed during in-situ melting in an Environmental Scanning Electron Microscope (ESEM) at temperatures above 900 "C. This oxide layer acts as a barrier for particle penetration but it can be dissolved in the melt at temperatures above 1250 "C and consequently it opens a "window" for particle inject

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