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Functionally Graded Materials produced with High Power Lasers

Published online by Cambridge University Press:  17 March 2011

Jeff Th. De Hosson  and
Yutao Pei
Jeff Th. De Hosson
Affiliation:
Department of Applied Physics, Materials Science Center and Netherlands Institute of Metals Research, University of Groningen Nijenborgh4, 9747 AG Groningen, The Netherlands.
Yutao Pei
Affiliation:
Department of Applied Physics, Materials Science Center and Netherlands Institute of Metals Research, University of Groningen Nijenborgh4, 9747 AG Groningen, The Netherlands.
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Abstract

With a well-controlled laser melt injection (LMI) process, for the first time the feasibility is demonstrated to produce SiC particles (SiCp) reinforced Ti6Al4V functionally graded materials (FGMs). SiCp are injected just behind the laser beam into the extended part of the laser melt pool that is formed at relatively high beam scanning velocities. The process allows for the minimization of the decomposition reaction between SiCp and Ti6Al4V melt, and also leads to FGMs of SiCp/Ti6Al4V instead of a homogeneous composite layer on Ti6Al4V substrates. An injection model is designed based on the temperature/viscosity field of the laser pool for a deeper understanding the mechanism of formation of the FGMs with LMI. The model is based on finite element calculations of the temperature field in the melt pool, physical considerations of the LMI process and it is supported by experimental observations. Three types of reaction layers are observed around SiCp, namely a thin monocrystalline TiC layer, a cellular polycrystalline TiC layer and a thick mixed layer of TiC with Ti5Si3. Among them, only the monocrystalline TiC layer exhibits particular orientation relationships to the SiCp lattice, i.e. (111)TiC//(0001)SiC and <110>TiC//<1100>SiC or (111)TiC // (1012)SiC and <110>TiC//<1210>SiC. These two kinds of TiC reaction layers act as a barrier against the interfacial reaction and its swift formation during rapid cooling hinders the dissolution of SiCp in the Ti-melt.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 697: Symposium P – Surface Engineering 2001--Fundamentals and Applications , January 2001 , P4.3
Copyright
Copyright © Materials Research Society 2002

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References

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