Abstract No.:	4554
Title:	Microstructure and properties of Ti-Al deposit produced by cold spraying
Authors:	Hongtao Wang* / Jiangxi Engineering Research Center for Materials Surface Remanufacturing School of Mechanical and Materials Engineering Jiujiang University, Jiujiang, Jiangxi, P.R.China Xiao Chen / Jiangxi Engineering Research Center for Materials Surface Remanufacturing School of Mechanical and Materials Engineering Jiujiang University, China Hai-Long Yao/ Jiangxi Engineering Research Center for Materials Surface Remanufacturing School of Mechanical and Materials Engineering Jiujiang University, China Xiao-Bo Bai/ Jiangxi Engineering Research Center for Materials Surface Remanufacturing School of Mechanical and Materials Engineering Jiujiang University, China Gang-Chang Ji/ Jiangxi Engineering Research Center for Materials Surface Remanufacturing School of Mechanical and Materials Engineering Jiujiang University, China
Abstract:	In the present study, a Ti-Al deposit was produced by cold spraying of powder mixture of Ti-50Al (at.%) assisted with annealing treatment. The deposition behavior of Ti-Al powder mixture and microstructural characteristics of as-sprayed and annealed Ti-Al coatings are characterized. The effect of annealing temperature on the phase structure, microstructure evolution and properties such as microhardness and wear performance was also investigated. It was found that the as-deposited Ti-Al composite exhibited a dense microstructure and Al particles constituted the matrix in which the deformed Ti particles were uniformly distributed. After heat treatment at 550oC, in-situ TiAl3 and TiAl intermetallic phases were appeared in the Ti-Al deposit through solid reaction between Ti particles and Al particles. While the porosity in the as-sprayed precursor deposits was about zero, significant porosity developed during annealing treatment and the sources for this are discussed. With increasing annealing temperature, the content of Ti-Al intermetallic phases was gradually increased. As a result, the microhardness of Ti-Al deposit increased and its wear resistance gradually improved. Key words: Ti-Al deposit; Cold spraying; Annealing treatment; intermetallics; microstructure; Properties

<= go back