A comprehensive investigation, encompassing microstructural analysis of the subsurface and bulk regions, along with tensile testing near the solidus temperature in the range of 520–580 °C and with two strain rates (10^–4 and 10^–3 s⁻¹), was conducted on two AA5182 alloy ingots (A and B) cast at casting speeds of 60 and 75 mm \(\bullet\) min⁻¹, respectively. Microstructural analysis revealed an equiaxed grain structure throughout Ingot A, whereas Ingot B transitioned from an equiaxed structure in the subsurface to a columnar grain structure in the bulk region. Regarding intermetallic phases, Ingot A showed predominant Al₆(Fe,Mn), whereas Ingot B exhibited a high amount of needle-like Al₃Fe. Consequently, Ingot A exhibited superior semisolid tensile properties compared to Ingot B at the given test temperatures. The difference between the two ingots became pronounced at the low strain rate of 10^–4 s⁻¹, with the brittle temperature range (BTR) values of Ingot B higher than those of Ingot A. An assessment of the hot-tearing susceptibility (HTS) using the BTR criterion revealed that the HTS of Ingot B was higher than that of Ingot A, confirmed by the occurrence of a large transverse macrocrack during the direct-chill casting of Ingot B.

一项全面的研究，包括地下和本体区域的微观结构分析，以及在 520-580 °C 范围内的固相线温度附近和两种应变速率（10 ^–4和 10 ^–3  s ^-1）下进行的拉伸测试。在分别以 60 和 75 mm \(\bullet\) min ⁻¹的铸造速度铸造的两个 AA5182 合金锭（A 和 B）上进行。微观结构分析显示，整个铸锭 A 具有等轴晶结构，而铸锭 B 从表面下的等轴结构转变为块体区域的柱状晶结构。关于金属间相，锭A显示出主要的Al ₆ (Fe,Mn)，而锭B显示出大量的针状Al ₃ Fe。因此，在给定的测试温度下，与锭 B 相比，锭 A 表现出优异的半固态拉伸性能。两种铸锭之间的差异在 10 ^–4  s ^-1的低应变速率下变得明显，其中铸锭 B 的脆性温度范围 (BTR) 值高于铸锭 A 的值。热撕裂敏感性 (HTS) 的评估）使用 BTR 标准表明，铸锭 B 的 HTS 高于铸锭 A，这通过铸锭 B 直冷铸造过程中出现的大的横向宏观裂纹得到证实。