Oxidation Behavior of TiAl Based Alloys Prepared by Spark Plasma Sintering

Hua Chen; Jing Chao Zhang; X.Y Lu

doi:10.4028/www.scientific.net/AMR.152-153.940

Paper Titles

Optically Active Films Fabricated from Poly(Allylamine Hydrochloride) and R-(+)-1-Phenylethylamine Derivatives of Poly(Ethylene-Alt-Maleic Acid) with Different Degrees of Substitution
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Thermal Property, Morphology, Mechanical and Rheological Properties of a Modified Bio-Polymers Prepared by Blending Poly(3-Hydrobutyrate-Co-4-Hydrobutyrate) with Chain Extenders
p.924

An Ab Initio Study on Negative Differential Resistance in Pyrrole Trimer Molecular Device
p.931

Preparation and Characterization of Modified Activated Carbon and its Influencing Factors of Cd²⁺ Adsorption
p.935

Oxidation Behavior of TiAl Based Alloys Prepared by Spark Plasma Sintering
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Behavior of Phosphorus Adsorption from Aqueous Solutions on Modified Activated Alumina
p.945

A Novel Structure Design of Conductive and Magnetic Electromagnetic Shielding Composites
p.950

Research on Optimization Design of the Lateral Stiffness Satio about the Frame-Supported Multi-Ribbed Structure
p.954

Protection Capability of Different Confinement Plates for Rubber Composite Armours against Shaped Charges
p.959

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Oxidation Behavior of TiAl Based Alloys Prepared by Spark Plasma Sintering

Abstract:

The spark plasma sintering (SPS) microstructure and high temperature oxidation behavior of TiH2-45Al-0.2Si-5Nb(at.%) alloy were investigated.Emphasis was placed on the effect of SPS microstructures, obtained by blend powder and mechanical alloying powder. The mass gain due to oxidation was measured using an electro balance. The oxide layers as well as its micro-structure were examined by SEM and EDS, and XRD. The results show that sintered microstructure of blend powder is composed of fully lamellar TiAl/ Ti3Al phase, and that of the mechanical alloying powder is composed of finer granular TiAl/Ti3Al phase. The latter oxidation rate is lower, and forms continuous mixed oxide layer of Al2O3 and TiO2. Both SPS microstructure of blend powder and mechanical alloying powder are superior in oxidation behavior to ordinary vacuum sintering.