Abstract

The effect of multidirectional forging on the grain structure and parameters of secondary-phase particles in the Al–4.8Mg–1.2Mn–0.1Cr alloy has been investigated using the methods of the scanning and transmission electron microscopy. The multidirectional forging performed at a temperature of 350°C to a cumulative strain of 10.5 has resulted in a 1.5 decrease in average particle sizes of the manganese-bearing phases of crystallization origin and dispersoids and in the formation of a structure with a mean grain size of 1.7 µm. Multidirectional forging included in a sheet processing, in contrast to hot rolling, forms an equiaxed grain structure with a grain size of about 6 µm in recrystallized sheets and with enhanced strength characteristics.

中文翻译：

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多向锻造对Al–Mg–Mn–Cr合金组织和力学性能的影响

摘要

使用扫描和透射电子显微镜方法研究了多方向锻造对Al–4.8Mg–1.2Mn–0.1Cr合金中的第二相颗粒的晶粒结构和参数的影响。在350°C的温度下进行多向锻造，使其累积应变为10.5，导致结晶起点和弥散相的含锰相的平均粒径减小1.5，并形成平均晶粒度的组织1.7微米。与热轧相比，片材加工中包括的多方向锻造形成等轴晶组织，在重结晶片材中晶粒尺寸约为6 µm，强度特性得到增强。