Effects of Sn Content on Damping and Mechanical Properties of Al-10Si-1.5Mg-x Sn Alloy
The mechanical properties,damping properties,and microstructure characteristics of Al-10Si-1.5Mg-x Sn(x=0～6.0%)alloy was investigated,and the variation law of damping and mechanical properties with different Sn content were analyzed.The results indicate that microstructure of the α-Al phase in the alloy is refined with Sn addi-tion,which reacts with Mg to generate Mg2Sn phase,resulting in the reduction of Mg2Si phases.With Sn content of 4.0%,α-Al remains the fined feature,while β-Sn and Mg2Sn are abundant and uniformly distributed.When Sn con-tent further increasing to 6.0%,α-Al、β-Sn and Mg2Sn are coarsened obviously.With Sn content increasing from 0 to 6.0%,the tensile strength of alloy is gradually decreased from 206 MPa to 169 MPa,and the elongation maintains 2.0%.With the increase of Sn content,the damping properties of alloy are increased firstly and then decreased,reach-ing a peak at 4.0%Sn.The damping loss factor tanh at 25℃/1 Hz,200℃/1 Hz and 25℃/40 Hz is 0.038,0.058 and 0.069,respectively.
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