An icosahedral (I) single phase with magnetization at room temperature (RT) has been found to form in a sheet with a thickness of 0.5 mm for an Al64Pd15Mn15B6 alloy prepared by casting its molten alloy into a copper mold and then annealing for 360 ks at 650 K. The as-cast alloy consists of an I-phase containing a small amount of the cubic AlPd (β) phase and the subsequent annealing at 650 K causes the formation of the single I-phase and the disappearance of the β phase. The further increase in annealing temperature results in the transition to equilibrium crystalline phases accompanying the disappearance of the magnetization. The magnetization in a field of 1.59 MA/m at RT is 1.00×10-5 Wb·m/kg in the as-cast state. It increases gradually with increasing annealing temperature, shows a maximum of 1.26×10-5 Wb·m/kg at 650 K and then disappears by the exhaust of B from the I-phase saturated with B before the completion to equilibrium crystalline phases. The finding that the magnetic I-phase is obtained in the bulky Al-Pd-Mn-B alloy by the simple process of casting and annealing is important in the subsequent development of ferromagnetic I-alloys.
|ジャーナル||materials transactions, jim|
|出版ステータス||Published - 1994 2月|
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