Ni3Si 系金属間化合物の機械的性質に及ぼす成分組成並びにMA条件の影響

概要

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Ni3Si intermetallic compounds have an excellent corrosion resistance in sulphuricacid solution. However, production of these compounds was difficult because of poor ductility caused by formation of a very brittle phase. In order to suppress formation of the brittle phase, process conditions involving a mechanical alloying(MA) method have been investigated for the production of Ni3Si intermetallic compounds. First, fine Ni-Si composite powders prepared by the MA method were hot extruded. Then Ni3Si intermetallic compounds were obtained by a particular heat treatment. Influence of the constituents and the MA conditions on mechanical properties of the Ni3Si intermetallic compounds were investigated. As a result, in 13.1 mass%Si- 86.9 mass%Ni materials, tensile strength improved as MA time became longer, although the material had poor ductility. When the Si content was reduced below 13.1 mass%, the tensile strength improved and ductility increased. The critical Si content for achieving of ductility was 12.2 mass%Si.
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