Synthesis of MoSi2-TiSi2 pseudobinary alloys by reactive sintering |
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Authors: | Kiyotaka Matsuura Tatsuya Ohmi Masayuki Kudoh Tohru Hasegawa |
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Affiliation: | (1) Present address: the Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, 060-8628 Hokkaido, Japan;(2) Kawasaki Heavy Industries, Ltd., 650-8680 Hyogo, Japan |
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Abstract: | MoSi2-TiSi2 pseudobinary alloys are synthesized from mixtures of elemental powders of molybdenum, silicon, and titanium by reactive sintering under a pseudoisostatic pressure of 150 MPa. When the titanium content in the alloy increases from 0 to 33 at. pct, the density of the alloy decreases from approximately 6 to 4 g/cm3, while the relative density is more than 95 pct independent of the titanium content. Vickers hardness of the alloy is approximately 800 when the alloy consists of a monophase structure of α-MoSi2 or β-MoSi2. However, the hardness increases to approximately 950 when the alloy consists of a dual-phase structure of (α-MoSi2+β-MoSi2) or (β-MoSi2+γ-TiSi2). The oxidation resistance of the alloy at 773 K is approximately tripled when the titanium content increases from 0 to 1.7 at. pct, but the effect of the titanium content on the oxidation resistance becomes less remarkable as the titanium content increases. |
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