| Title |
Research Paper / Mechanical Behavior : A Model on the Embrittlement of Partially Crystallized Amorphous Al alloys |
| Authors |
이종현(Jong Hyeon Lee); 정병선(Byung Sun Chung); 김형섭(Hyoung Seop Kim); 홍순익(Sun 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. |