Effects of Melt Holding and Ultrasonic Vibration on the Micro structure and Mechanical Properties of Al-Cu-Mn Alloy
Alloys with specific Cu/Mn ratios are capable of forming a stable icosahedral quasicrystal phase(I-Al65Cu20Mn15),but under conventional solidification conditions,it is difficult to form a large number of quasicrystal grainswith coarse sizes.This work focused on the study of Al-Cu-Mn quasicrystal alloy,investigating the quasicrystal formation rules through melt holding and ultrasonic vibration in the temperature range of quasicrystal I-phase.The results indicated that with the extension of the melt holding time,the size of the quasicrystal I-phase showed a trend of first decreasing and then increasing,especially when the melt holding time was 20 min,the quasicrystal particles exhibited a fine petal-like shape.Applying 600 W power ultrasonic vibration to the alloy melt after 20 min of meltholding refined the quasicrystal size,but increasing the power further caused coarsening of the I-phase.
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