A study on the microstructural evolution of Al-25 at. pct V-12.5 at. pct M (M = Cu,Ni, Mn) powders by planetary ball milling |
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Authors: | Keun Young Chang Kyoung Il Moon Kyung Sub Lee |
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Affiliation: | (1) Sangsung SDI, 330-300 ChonAnsi, Korea;(2) the Division of Plasma Technology R&D Division, Korea Institute of Industrial Technology, 330-825 ChonAnSi, Korea;(3) the Division of Materials Science and Engineering, Hanyang University, 133-791 Seoul, Korea |
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Abstract: | The alloying behavior of Al-25 at. pct V-12.5 at. pct M (M = Cu, Ni, Mn) by planetary ball milling of elemental powders hours
as been investigated in this study. In Al3V binary system, an amorphous phase was produced after 6 hours and the amorphous phase was mechanically crystallized after
20 hours. The large difference in the diffusivities between Al and V atoms in Al matrix results in the formation of the amorphous
phase when the homogeneous distribution of all the elements in a powder was achieved at 6 hours. According to thermal analyses,
the amorphous phase in the binary Al3V was crystallized at 350 °C. The addition of ternary elements (Cu, Ni, Mn) increased the activation energy for the crystallization
to D022 phase by interfering with the diffusion process. Therefore, ternary element addition improved the thermal stability of the
amorphous structures. The amorphous phase in the 12.5 at. pct Ni added Al3V was crystallized to D022 phase at 540 °C. The mechanical crystallization of the amorphous phase in the ternary element-added Al-V system either occurred
later or was not observed during ball milling up to 100 hours. It is thought that the amorphous intermetallic compacts could
be produced more easily in ternary element-added alloys by using an advanced consolidation method. |
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