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Effect of Processing on Oxidation of Ti5Si3

Published online by Cambridge University Press:  01 January 1992

Andrew J. Thom ,
Youngman Kim  and
Mufit Akinc
Andrew J. Thom
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering,Iowa State University, Ames, IA 50011
Youngman Kim
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering,Iowa State University, Ames, IA 50011
Mufit Akinc
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering,Iowa State University, Ames, IA 50011
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Abstract

The mechanical properties and oxidation resistance of HIPed Ti5Si3 have been measured. HIPing submicron size powder compacts produces a crack-free, fine-grained microstructure with significantly higher hardness and toughness than a coarse-grained microstructure which contains microcracks within larger grains. Oxidation resistance is influenced by the grain size. Coarse-grained material has much lower mass gain than finegrained material in an oxidizing atmosphere and exhibits parabolic oxidation kinetics. The oxidation resistance of fine-grained material was measured between 700°C and 1000°C in air. Mass gain at 120 hours was measured to be 0.07 mg/cm2 at 700°C. At 900°C cracking of the scale leads to linear oxidation kinetics and significantly higher mass gain.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1037
Copyright
Copyright © Materials Research Society 1995

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References

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