The present study was carried out to investigate the effects of Ni, Mn, Zr, and Sc additions, individually or in combination with other additives, on the microstructure and tensile properties of 354 casting alloy (Al—9wt%Si—1.8wt%Cu—0.5wt%Mg) at room temperature. Tensile tests were carried out in the as-cast, solution heat-treated, and aged conditions using different aging temperatures and times. Six alloys were prepared using the 354 alloy, comprising a) the base 354 alloy (G1) and five other alloys (G6 to G10) containing Ni, Mn, Sc, Zr, added individually or in combination, and comprising one experimental alloy (G7) containing no copper. Among the alloys containing transition element additions (G6 through G10), the highest tensile and yield strength values are obtained with alloy G7 (2wt% Ni and 0.25wt% Zr but no Cu) in the as-cast and solution heat-treated conditions; alloys G8 and G10 also display a significant increase in tensile strength and ductility in the as-cast and solution heat-treated conditions. Solution heat treatment significantly improves strength and quality of these alloys even if they contain higher Fe and Mg levels compared to the base alloy. Holding the tensile samples of T6-treated G1 alloy resulted in a marked increase in the density of precipitated phase in the form of fine spherical particles. Increasing the holding time prior to deformation to 100 h resulted in the change in the morphology of the Al₂Cu precipitates into thin platelets distributed in two perpendicular directions.

本研究旨在研究单独添加或与其他添加剂组合使用的镍，锰，锆和r的添加对354铸造合金（Al-9wt％Si-1.8wt％Cu的显微组织和拉伸性能）的影响。 -0.5wt％Mg）在室温下。拉伸试验在铸态，固溶热处理和时效条件下使用不同的时效温度和时间进行。使用354合金制备了六种合金，包括：a）基础354合金（G1）和五种其他合金（G6至G10），分别或组合添加，其中包含Ni，Mn，Sc，Zr，并且包括一种实验合金（G7 ）不含铜。在含有过渡元素添加物（G6至G10）的合金中，使用G7合金（Ni含量为2wt％，Ni为0）可获得最高的拉伸强度和屈服强度值。在铸态和固溶热处理条件下，Zr含量为25wt％，但不含Cu）；合金G8和G10在铸态和固溶热处理条件下的抗拉强度和延展性也显着提高。固溶热处理显着提高了这些合金的强度和质量，即使与基础合金相比，它们所含的铁和镁含量也更高。持有经T6处理的G1合金的拉伸样品会导致球形细颗粒形式的析出相密度显着增加。将变形前的保持时间增加到100 h会导致Al的形态发生变化 固溶热处理显着提高了这些合金的强度和质量，即使与基础合金相比，它们所含的铁和镁含量也更高。持有经T6处理的G1合金的拉伸样品会导致球形细颗粒形式的析出相密度显着增加。将变形前的保持时间增加到100 h会导致Al的形态发生变化 固溶热处理显着提高了这些合金的强度和质量，即使与基础合金相比，它们所含的铁和镁含量也更高。持有经T6处理的G1合金的拉伸样品会导致球形细颗粒形式的析出相密度显着增加。将变形前的保持时间增加到100 h会导致Al的形态发生变化₂ Cu沉淀成沿两个垂直方向分布的薄血小板。