Effect of Y on Solidification Structure and Mechanical Properties of C611 Alloy
In this paper,the effect of Y addition on the solidification structure and mechanical properties of C611 aluminum alloy was studied.The results showed that with the increase of Y content,the secondary dendrite arm spacing and eutectic Si of α-Al structure in C611 alloy were gradually refined and modified,and the size of needle-like Al4(Fe,Mn)Si2 phase separated from the matrix was gradually reduced.When the Y content was 0.10%,the average length of Al4(Fe,Mn)Si2 phase decreases from 48.65 μm to 28.20 μm,and some Fe was precipitated in the form of granular Al15(Fe,Mn)4Si2 phase and dispersed in the eutectic silicon,which played a certain role in strengthening the matrix.At this time,the tensile strength and elongation of the aluminum alloy were 166 MPa and 6.2%,which were 7.1%and 29.2%higher than those of the matrix alloy without Y addition.
C611 aluminum alloyrare earth element Ysolidification structuretensile strength
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