非晶質相の結晶化を利用して作製した高強度P/Mアルミニウム合金

概要

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Mechanical properties of crystalline Al100-x(Ni0.33Y0.54Co0.13)x (9≤x≤15at.%) compacts fabricated by the combination of the high-pressure gas atomization method and extrusion of amorphous powders have been investigated. Furthermore, mechanical properties of Al89Ni3.7Y5.9Co1.4 compacts prepared by the closed P/M processing have been investigated and compared with those prepared by the ordinary processing. Crystalline aluminum alloy compacts showing the high strength above 900MPa were obtained by the ordinary processing. The strength and elongation were furthermore improved by the closed processing. For the extrusion of low reduction area of 60% (2.5 in the extrusion ratio), high strength compacts showing the strength above 800MPa were fabricated by the closed processing. The present work demonstrates that the structural modification through the crystallization of amorphous phases in the closed P/M processing are more effective for obtaining the high strength aluminum alloy compacts rather than the ordinary rapid solidification and the ordinary P/M processing.