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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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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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