Abstract
The influence of composition and mechanically grinding (MG) on the heat characteristic and the quasicrystalline size in rapidly solidified Al-Cr-Si alloy is investigated. The size of quasicrystal is quantitatively measured with Atomic Force Microscope (AFM). Al74Cr20Si6, Al77Cr13Si10 and Al90Cr6Si4 alloy ribbons are prepared by single roll quenching. Al74Cr20Si6 alloy consists of quasicrystalline single phase, and others consist of Al phase and quasicrystalline phase. The crystallization temperature of the quasicrystal becomes lower with increasing Al content in alloy. The size of quasicrystal in Al74Cr20Si6 ribbon is larger than 500nm, and the average sizes of quasicrystal in Al77Cr13Si10 ribbon and Al90Cr6Si4 ribbon are 177 and 89nm, respectively. The reduction in the crystallization temperature relates to the size of quasicrystal. By mechanically grinding the crystallization temperature and the size of quasicrystal become lower and smaller. The average size of quasicrystal in mechanically ground Al90Cr6Si4 for 1800s is 76nm. The crystallization temperature decreases because of breaking the quasicrystal in MG.
