This study investigates the effect of solution treatment (at 470 °C for 0–48 h) on the microstructural evolution, tensile properties, and impact properties of an Al–5.0Mg–3.0Zn–1.0Cu (wt%) alloy prepared by permanent gravity casting. The results show that the as-cast microstructure consists of α-Al dendrites and a network-like pattern of T-Mg₃₂(AlZnCu)₄₉ phases. Most of the T-phases were dissolved within 24 h at 470 °C; and a further prolonging of solution time resulted in a rapid growth of α-Al grains. No transformation from the T-phase to the S-Al₂CuMg phase was discovered in this alloy. Both the tensile properties and impact toughness increased quickly, reached a maximum peak value, and decreased gradually as the solution treatment proceeded. The impact toughness is more closely related to the elongation, and the relationship between impact toughness and elongation appears to obey an equation: \({\text{IT}} = 8.43{\text{EL}} - 3.46\). After optimal solution treatment at 470 °C for 24 h, this alloy exhibits excellent mechanical properties with the ultimate tensile strength, yield strength, elongation and impact toughness being 431.6 MPa, 270.1 MPa, 19.4% and 154.7 kJ/m², which are comparable to that of a wrought Al–6.0Mg–0.7Mn alloy (5E06, a 5xxx aluminum alloy). Due to its excellent comprehensive combination of mechanical properties, this cast alloy has high potential for use in components which require medium strength, high ductility and high toughness.

这项研究调查了固溶处理（在470°C下持续0–48 h）对永久性制备的Al–5.0Mg–3.0Zn–1.0Cu（wt％）合金的组织演变，拉伸性能和冲击性能的影响。重力铸造。结果表明，铸态组织由α-Al枝晶和T-Mg ₃₂（AlZnCu）₄₉相的网状图案组成。大多数T相在470°C的24小时内溶解。固溶时间的进一步延长导致α-Al晶粒的快速生长。从T相到S-Al ₂没有转变在该合金中发现了CuMg相。随着固溶处理的进行，拉伸性能和冲击韧性都迅速增加，达到最大值，然后逐渐降低。冲击韧性与伸长率更紧密相关，并且冲击韧性和伸长率之间的关系似乎服从以下方程：\（{\ text {IT}} = 8.43 {\ text {EL}}-3.46 \）。经过470°C的最佳固溶处理24小时后，该合金具有优异的机械性能，其极限拉伸强度，屈服强度，伸长率和冲击韧性分别为431.6 MPa，270.1 MPa，19.4％和154.7 kJ / m ^2。，与可变形的Al–6.0Mg–0.7Mn合金（5E06，5xxx铝合金）相当。由于其优异的综合机械性能，这种铸造合金具有很高的潜力，可用于要求中等强度，高延展性和高韧性的零件。