The thermal characteristic and the structure of rapidly solidified Al-Cr-Si ribbons by single roll melt spinning were examined and ability of sintering by pulsed current sintering was investigated. A single phase of quasicrystal is produced in Al
74Cr
20Si
6, and a mixed phase of Al and quasicrystal was produced in Al
77Cr
13Si
10. The mixed phase of Al and quasicrystal was produced in Al
90Cr
xSi
(10-x) (x=3,6,8,10), also. The quasicrystal in Al
90Cr
xSi
(10-x) x=3, 6, 8) ternary system was different thermal stability from the quasicrystal in Al
90Cr
10 binary system because of with a different quasicrystalline structure. The transform temperature of the quasicrystal to a stable phase in Al-Cr-Si ternary system was 100 degree higher than Al-Cr binary alloy. The porosity of a sintered material decreased with increasing Al phase in the rapidly solidified powder from the result of sintered Al
74Cr
20Si
6, Al
77Cr
13Si
10 and Al
90Cr
6Si
4, and Al
90Cr
6Si
4 was the highest density. The effect of sintering temperature and applied pressure on sintering density was investigated in Al
90Cr
6Si
4. The sintering density at 513K in 500MPa was above 99%. Then, the sintering density at 613K in 250MPa was 99% or more, and the applied pressure could be decreased in half.
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