Precipitation behavior of as-quenched Al_(60)Si_(40) alloy

摘要

Since the high tensile strength above 1000 MPa of Albase amorphous alloys was found in 1988 [1], nonequilibrium Al-base alloys have attracted great attention [2-11]. Although in early work binary eutectic Al-Si [12] and Al-Ge [13] alloys with a structure of amorphous and crystalline phase have been made by the gun quenching technique, the structure is unstable at room temperature. Subsequently Al-Fe-Si, Al-Fe-Ge and Al-Mn-Si alloys have been utilized to manufacture amorphous alloys due to their better glass forming ability (GFA) although these materials are, as yet, not viable as engineering materials [14, 15]. It is known that (a) Al-Si binary alloys are low cost and have wide industrial application and (b) nanocrystalline crystals have an enhanced solubility in comparison with the corresponding coarse-grained crystals due to an electronic effect [16].