발간논문

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Vol.37, No.3, 288 ~ 295, 1999
Title
Research Paper / Mechanical Behavior : A Model on the Embrittlement of Partially Crystallized Amorphous Al alloys
이종현Jong Hyeon Lee, 정병선Byung Sun Chung, 김형섭Hyoung Seop Kim, 홍순익Sun Ig Hong
Abstract
The strength of partially crystalline Al-Ni-Y alloys was found to exhibit the maximum when the size of Al particle is 10㎚. Partially crystallized Al-Ni-Y alloys were also found to be brittle when the size and the volume fraction of the Al particles exceeded the optimum values. On the assumption that the diffusivity of Y is so low that Y atoms rejected from FCC-Al particles are limited near interface region and the diffusivity of rejected Ni atoms are so high that the perfectly mixed solution is readily attained in the matrix, the reaction in three regions, Al particles, Y accumulated interlayers and amorphous matrix, are derived by balancing the quantity of each element. Al-Y-Ni alloys were assumed to become brittle when the solute content of interface layers reached the critical value (20%). The predictions based on the Y accumulation model are in good agreement with the published data available.
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