Premium
Gefügemodifikation und Mechanismen sprühkompaktierter Eisen enthaltender hypereutektischer Al‐Si‐Legierungen
Author(s) -
Hou L. G.,
Cai Y. H.,
Cui H.,
Zhang J. S.
Publication year - 2010
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201000649
Subject(s) - materials science , alloy , phase (matter) , microstructure , metallurgy , spray forming , chemistry , organic chemistry
The Fe‐bearing hypereutectic Al‐Si alloys with/without Cr/(Cr+Mn) addition have been prepared by Spray Forming (SF) process. With 2 wt.% Cr addition, the short‐rod β‐Al 5 FeSi phase in spray‐formed Al‐25Si‐5Fe‐3Cu (wt.%, denoted as 3C) alloy can be substituted by particulate α‐Al(Fe,Cr)Si phase with sizes less than 5–6 μm. But small quantity of blocky β‐Al 5 (Fe,Cr)Si phase still appears in Cr‐added hypereutectic Al‐Si alloy. When (2Cr+1Mn) (wt.%) are added simultaneously into 3C alloy, almost all the short‐rod β‐Al 5 FeSi phase or blocky β‐Al 5 (Fe,Cr)Si phase disappear, instead, the α‐Al(Fe,Cr,Mn)Si phase become the only Fe‐bearing phase. During heat treatments, the other two spray‐formed hypereutectic Al‐Si alloys (besides SF‐3C alloy) are thermodynamically stable for the appearance of high thermodynamically stable particulate α‐Al(Fe,Cr)Si/α‐Al(Fe,Cr,Mn)Si phase. Also the phase transformation occurred during the heating/cooling process of the present hypereutectic Al‐Si alloys are investigated and the mechanism of microstructural formation of the spray‐formed alloys are discussed.