Effect of Processing on Oxidation of Ti5Si3

MRS Online Proceedings Library volume 288, pages1037–1042(1992)Cite this article

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.

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Acknowledgments

Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under contract number W-7405-ENG-82. This research was supported by the Office of Basic Energy Science, Materials Science Division.

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  1. Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, IA, 50011

    Andrew J. Thom, Youngman Kim & Mufit Akinc

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  1. Andrew J. Thom
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  2. Youngman Kim
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  3. Mufit Akinc
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Thom, A.J., Kim, Y. & Akinc, M. Effect of Processing on Oxidation of Ti5Si3. MRS Online Proceedings Library 288, 1037–1042 (1992). https://doi.org/10.1557/PROC-288-1037

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