The present work was carried out on Al–Si-Cu-Mg-354 alloy to investigate the role of transition metals addition (mainly Zr, Ni and Mn) as well as heat treatment on its performance at ambient/room temperature (25 °C). Mechanical properties were studied using tensile and impact testing, whereas the microstructure was investigated using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (STEM). The fracture surfaces of selected samples prepared from impact-tested bars were examined applying FESEM. The results show that the proposed additions enhanced the alloy tensile and impact properties. The T6-tempered alloys revealed higher tensile strength than T5-tempered alloys. The impact properties of the alloys are highly influenced by the Al₂Cu phase particles rather than the eutectic silicon particles. Thus, the impact properties show no significant variations with respect to the condition studied, i.e., the total energies absorbed by the five alloys in the as-cast condition are close in their values, as is the case for the T5- and T6-treated conditions. Due to the precipitation of a fairly large amount of insoluble intermetallics, all fractures were brittle in nature.

本工作在Al-Si-Cu-Mg-354合金上进行，以研究过渡金属添加物（主要是Zr，Ni和Mn）的作用以及热处理对其在环境/室温（25°C）下的性能的影响。 ）。使用拉伸和冲击测试研究了机械性能，而使用场发射扫描电子显微镜（FESEM）和透射电子显微镜（STEM）研究了微观结构。使用FESEM检查了由冲击测试棒制备的选定样品的断裂表面。结果表明，所提出的添加剂增强了合金的拉伸和冲击性能。T6回火合金比T5回火合金具有更高的拉伸强度。合金的冲击性能受到Al _2的强烈影响Cu相颗粒而不是低共熔硅颗粒。因此，冲击性能相对于所研究的条件没有显着变化，即在铸造状态下五种合金吸收的总能量值接近，如T5和T6处理的情况条件。由于大量不溶性金属间化合物的沉淀，所有裂缝本质上都是脆性的。