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首页> 外文期刊>Journal of Materials Research >Quasicrystalline phase formation in A1_(62)Cu_(22.5)Fe_(12.5) and Al_(55)Cu_(22.5)Fe_(12.5)Be_7 alloys
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Quasicrystalline phase formation in A1_(62)Cu_(22.5)Fe_(12.5) and Al_(55)Cu_(22.5)Fe_(12.5)Be_7 alloys

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摘要

Formation of the icosahedral quasicrystalline phase in conventionally cast A1_(62)Cu_(22.5)Fe_(12.5) and Al_(55)Cu_(25.5)Fe_(12.5)Be_7 alloys were investigated. The icosahedral phase (I-phase) forming ability was greatly improved by partial replacement of Al by 7 at. percent Be. The as-cast Al_(55)Cu_(22.5)Fe_(12.5)Be_7 alloy consisted of dendritic primary I-phase and interdendritic #tau#-phase, whereas that of an as-cast A1_(62)Cu_(22.5)Fe_(12.5) alloy consisted of various phases such as the #beta#-, I-, and #tau#-phases, together with a small amount of the #lambda#- and #eta#-phases. The kinetic barrier for transformation into single I-phase by heat treatment was greatly reduced in an Al_(55)Cu_(22.5)Fe_(12.5)Be_7 alloy. The I-phase in an Al_(55)Cu_(22.5)Fe_(12.5)Be_7 alloy has the same face centered icosahedral structure as that in an A1_(62)Cu_(22.5)Fe_(12.5) alloy and is of high quality without phason strain.

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