AA7050 is an aluminum alloy with superior mechanical properties; however, it is prone to hot tearing (HT) during its production via direct-chill casting. This study focuses on extracting constitutive parameters of the alloy thermomechanical behavior in semi-solid state as well as gaining insight in its failure behavior. Tensile tests were performed using an Instron 5944 at solid fractions between 0.85 (550 °C) and 1.0 (465 °C), at deformation rates of 0.2 and 2 mm/min. The results showed that there are three mechanical behavior regimes in this solid fraction range: ductile at 1.0 (T = 465 °C) ≤ f_s < 0.97 (T = 473 °C), brittle at 0.97 (T = 473 °C) ≤ f_s ≤ 0.9 (T = 485 °C) and then ductile again (at 0.9 (T = 485 °C) < f_s ≤ 0.85 (T = 550 °C)). Fracture surface analysis revealed that the fracture mode was mostly intergranular with fracture propagating through solid bridges as well. Semi-solid constitutive parameters were obtained by making a simple thermal model and numerical tensile tests in ALSIM software package and comparing the simulation results with experimental mechanical tests. The extracted constitutive parameters and available information from the literature support the fact that AA7050 is more susceptible to HT than AA5182 and Al-2 wt pct Cu alloys. The obtained parameters can further enhance the predictive capability of computer simulations of direct-chill casting.

AA7050是具有卓越机械性能的铝合金；但是，在生产过程中通过直接冷硬铸造容易产生热撕裂。这项研究的重点是提取半固态合金热力学行为的本构参数，以及深入了解其失效行为。使用Instron 5944在0.85（550°C）和1.0（465°C）之间的固体分数下以0.2和2 mm / min的变形速率进行拉伸测试。结果表明，有在该固体分数范围三个机械行为制度：延性在1.0（Ť = 465℃）≤ ˚F_小号<0.97（Ť = 473℃），脆0.97（Ť = 473℃）≤ ˚F_小号≤0.9（Ť= 485℃），然后再次延性（在0.9（Ť = 485℃）< ˚F_小号≤0.85（Ť = 550℃））。断裂表面分析表明，断裂模式主要是粒间的，并且断裂也通过实心桥传播。通过在ALSIM软件包中建立简单的热模型和数值拉伸试验，并将模拟结果与实验力学试验进行比较，可以获得半固体的本构参数。提取的本构参数和来自文献的可用信息支持以下事实，即AA7050比AA5182和Al-2 wt pct Cu合金对HT更敏感。所获得的参数可以进一步增强直接冷铸计算机仿真的预测能力。