Abstract
Rapidly quenched powders of Al74Mn20Si6 were prepared by the ultrasonic gas atomization technique. Particles ranged from less than 40 μm to greater than 150 μm. The smaller particles were found to be primarily of the icosahedral phase. Larger powders showed an increasing proportion of the β-Al-MnSi phase. There was no evidence for the presence of α-AlMnSi commonly found in crystallized icosahedral AlMnSi alloys. Magnetic measurements showed the existence of a local Mn moment in all alloys. This moment was found to be 1.27 μB for the icosahedral phase and 0.63 μB for the β phase.
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