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采用Instron万能材料试验机研究了Sr(0%或0.12%)、Cr(0%、0.2%、0.4%、0.6%和0.8%)对含铁1.2%的A356合金力学性能的影响。结果表明:无论是单独加入Cr或复合加入Sr、Cr,随Cr含量增加,含铁1.2%的A356合金试样的抗拉强度、伸长率均呈先升后降的趋势。Sr、Cr复合加入比单独加入Cr能明显提高合金的力学性能。经T6热处理(固溶540℃,8 h+时效145℃,8 h)后,该合金的抗拉强度和伸长率得到较大提高。
The effects of Sr (0% or 0.12%), Cr (0%, 0.2%, 0.4%, 0.6% and 0.8%) on the mechanical properties of A356 alloy containing 1.2% Fe were investigated by using Instron universal testing machine. The results show that the tensile strength and elongation of A356 alloy with 1.2% Fe content both increase and then decrease with the addition of Cr or with the addition of Sr and Cr. The addition of Sr and Cr can obviously improve the mechanical properties of the alloy compared with adding Cr alone. T6 heat treatment (solution 540 ℃, 8 h + aging 145 ℃, 8 h), the tensile strength and elongation of the alloy has been greatly improved.