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Sn对Al-Si-Mg系合金的时效过程产生明显的影响,合金中加入Sn,若不进行时效处理,Sn作为夹杂降低合金的力学性能;若合金进行时效处理,Sn抑制Mg2Si沉淀相的聚集、长大,使其弥散分布,因而合金的力学性能有较大幅度的提高。运用Pashley时效动力学模型解释了Al-Si-Mg系合金的时效行为。用Lomer公式,通过计算,Al-Si-Mg系合金中加入微量元素Sn后,合金中的过剩空位浓度约为基体中过剩空位浓度的1/200,正是Sn与空位的较高结合能,抑制了Mg2Si沉淀相的粗大。
Sn has a significant effect on the aging process of Al-Si-Mg alloys. When Sn is added to the alloy, Sn acts as inclusions to reduce the mechanical properties of the alloys without aging treatment. If the alloy is aged, Sn inhibits the aggregation of precipitated Mg2Si phase , Grow up, make it diffusely distributed, so the mechanical properties of the alloy have a more substantial increase. The aging behavior of Al-Si-Mg alloys was explained by Pashley’s aging kinetics model. By means of Lomer formula, the excess vacancy concentration in Al-Si-Mg alloy is about 1/200 of the excess vacancy concentration in Al-Si-Mg alloy, which is the higher binding energy of Sn and vacancies. Inhibit the Mg2Si precipitated phase coarse.