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Vol.34, No.6, 696 ~ 703, 1996

Title

Research Paper - Mechanical Behavior - : Mechanical Properties of Al - TM - RE ( or TM ) Amorphous Alloys with Al Nanoparticles

윤광민Gwang Min Yoon, 김영환Yeong Hwan Kim, 정병호Byong Ho Jung, 김인배In Bae Kim

Abstract

The mechanical properties and thermal stability of amorphous Al_(88)Ni_9(Fe,Zr)₃and Al_(88)Ni_(10)(Y,Ce)₂ alloys produced by single roller melt-spinning method were investigated. Amorphous alloys containing nanoscale Al particles which are obtained by aging treatment in the temperature range above the crystallization temperature(T_x) exhibited σ₁ and H_v higher than those of amorphous single phase alloys with the same composition. T_x in the mixed phase alloys increased significantly with rising aging temperature. This indicates that the precipitation of the Al nanoparticles thermally stabilizes the remained amorphous matrix. The H_v for the mixed alloys increased monotonically with increasing the precipitation amount(V_f) of the Al phase. The σ₁and ε₁ showed a maximum value in an optimum V₁ value. This is probably thought because the Al nanoparticles which have higher mechanical strength compared with the amorphous matrix with the same composition act as an effective resistance to shear deformation of the amorphous matrix. The amorphous Al_(88)Ni_9Fe₃ exhibited combined effect of the dispersion strengthening and a large elongation resulted from the precipitation of the Al nanoparticles at elevated temperature.

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