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Vol.37, No.5, 550 ~ 556, 1999

Title

Research Paper / Solidificantion : Formation and Properties of Amorphous Phases in Liquid Quenched Al-Ni-Mm Alloys

김영환Yeong Hwan Kim, 윤광민Gwang Min Yoon, 김지훈Ji Hun Kim, 예병준Byung Joon Ye, 최갑송Gab Song Choi, 김인배In Bae Kim

Abstract

Formation range, thermal and mechanical properties of amorphous phase in liquid quenched Al_(100-(X+Y))Ni_xMm_Y ((X+Y)≤20at%) alloys were investigated. Mixed phases of (Al+comp) and (Al+Am) were obtained in the range of (Ni+Mm)≤6at% and 6at%≤(Ni+Mm)≤10at%, respectively. Amorphous single phase was formed in the range of 10at%≤(Ni+Mm)≤20at%. An onset temperature(Tx) for crystallization of amorphous phase increased with increasing (Ni+Mm) content, indicating an enhancement of the thermal stability. Glass transition phenomenon was occurred in the composition of Al((90-x))Ni_(10)Mm_x (X=5-10at%) and Al_((92-x))Ni_8Mm_x (X=6-10at%). Tensile fracture strength(σ_f) and hardness(H_v) for the mixed phase alloys of (Al+Am) showed higher values than those of other phases. In the amorphous single phase region, σ_f and H_v increased with solute (Ni+Mm) content. The strengthening was presumed to be caused by an increase of Al-Ni or Al-Mm atomic pairs with strong bonding nature in the amorphous matrix. (Received September 1, 1998)

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