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Chemical leaching and magnetic properties of non-equilibrium Al(Co–Cu) powders produced by rod milling |
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| Authors: | Hyun-Goo Kim Wha-Nam Myung K. Sumiyama K. Suzuki |
| Affiliation: | a Department of Physics Education, Chosun University, 375 Seosuk-dong, Kwangju 501-759, South Korea b Department of Physics, Chonnam National University, Kwangju 500-757, South Korea c Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan d Institute for Advanced Materials Research in Sendai, Tokai University in Tokyo, Tokyo, Japan |
| Abstract: | We report upon the chemical leaching and magnetic properties of nanoscale crystalline Al0.6(Co25Cu75)0.4 alloy powders produced by rod milling. X-Ray diffractometry (XRD), transmission electron microscopy, differential scanning calorimetry, vibrating sample magnetometry, and superconducting quantum interference device magnetometry were used to characterize the as-milled and leached specimens. After 400 h of milling, only the b.c.c. phase of the intermetallic compound γ-Al3.892Cu6.10808 was detected by XRD. After annealing the leached specimen at 600 °C for 1 h, the nanoscale crystalline phase was transformed into the f.c.c. Cu phase, and this was accompanied by a change in the magnetic properties. The peaks of the magnetization shifted towards lower temperature with increasing external field. The temperature behavior at Tf (45 K) for direct current (d.c.) magnetic susceptibility measurements was quite different for field cooling and zero-field cooling. After cooling the leached specimen from 800 °C, magnetization increased gradually. |
| Keywords: | Transition metal alloys Nanocrystalline materials Magnetic measurements TEM X-Ray diffraction |
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