Abstract

Formability of Al/Mg or Al/Mg/Al laminates is essential to their further manufacture and application. However, there are few reports on their formability compared with the investigation on their microstructures and mechanical properties. In this paper, bulging deformation of Al/Mg/Al laminate was conducted at 170, 200, and 230 °C. The results show that both temperature and strain state affect the formability of laminate, and the peak dome height of 36.5 mm was obtained at 230 °C under equibiaxial tensile strain. Further texture analysis indicates that Mg layer exhibits basal texture with most grains elongated along the rolling direction, and continuous dynamic recrystallization occurs during the bulging process. Necking or fracture positions of bulging parts appear at outer rings, not at the apex with the highest deformation degree. For the same strain state and direction, the range of necking or cracking is extended and wall thickness along different directions is uniformized when temperature rises. Interfacial structure observation shows that cracking occurs in various positions in bulging, including in Al₃Mg₂, at Al/Al₃Mg₂, Mg₁₇Al₁₂/Al₃Mg₂, and Mg₁₇Al₁₂/Mg interfaces, which is almost impervious to temperature.

中文翻译：

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Al / Mg / Al层压板的膨胀能力和组织演变

摘要

Al / Mg或Al / Mg / Al层压板的可成形性对于其进一步的制造和应用至关重要。但是，与对其微观结构和机械性能的研究相比，关于其可成形性的报道很少。在本文中，Al / Mg / Al层压板的鼓胀变形是在170、200和230℃下进行的。结果表明，温度和应变状态均会影响层压板的成形性，在等双轴拉伸应变下于230°C时可获得36.5 mm的峰值拱顶高度。进一步的织构分析表明，Mg层表现出基本的织构，大多数晶粒沿轧制方向拉长，并且在鼓胀过程中发生了连续的动态重结晶。鼓起部分的颈缩或断裂位置出现在外圈，而不是在变形程度最高的顶点。对于相同的应变状态和方向，当温度升高时，颈缩或开裂的范围会扩大，并且沿不同方向的壁厚将变得均匀。界面结构的观察表明，在鼓胀的各个位置（包括铝）都发生了裂纹₃的Mg ₂，在铝/铝₃的Mg ₂，镁₁₇的Al ₁₂ /的Al ₃ Mg的₂和Mg ₁₇的Al ₁₂ / Mg的接口，这几乎是不透温度。