Abstract

The influence of a degree of strain by rotary forging, as well as post-deformation annealing on the structure and mechanical properties of a clad aluminum alloy/copper bimetallic material was studied. Rotary forging of the initial bimetallic billet was carried out step by step from a diameter of 20.1 mm to a diameter of 2.4 mm. Rotary forging of the aluminum alloy/copper bimetallic material to a diameter of 5.3 mm leads to the formation of a mixed fine-grained and nanocrystalline oriented structure in an aluminum shell and to a decrease in the average grain size by 4.5 times and to an increase in the density of crystalline defects in a copper core. A reduction in the aluminum alloy/copper bimetallic material diameter to 2.4 mm (with intermediate annealing) leads to the formation of a fine-grained elongated grain-subgrain oriented structure in the aluminum shell and to the formation of a mixed cellular and subgrain structure in a copper core. Rotary forging leads to a significant increase in the strength of the aluminum alloy/copper bimetallic material and to a decrease in ductility. The optimal combination of increased strength and satisfactory ductility provides post-deformation annealing.

Graphic Abstract

中文翻译：

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旋转锻造对铝合金/铜双金属材料组织演变及力学性能的影响

摘要

研究了旋转锻造以及变形后退火对覆层铝合金/铜双金属材料的组织和力学性能的影响。从直径20.1毫米到直径2.4毫米逐步进行初始双金属坯料的旋转锻造。铝合金/铜双金属材料的旋转锻造至直径5.3 mm导致在铝壳中形成混合的细晶粒和纳米晶取向结构，并使平均晶粒尺寸减小4.5倍并增加铜芯中晶体缺陷的密度。将铝合金/铜双金属材料的直径减小到2。4 mm（中间退火）导致在铝壳中形成细晶粒的细长晶粒-亚晶粒取向结构，并在铜芯中形成混合的蜂窝状和亚晶粒结构。旋转锻造导致铝合金/铜双金属材料的强度显着增加并且延展性降低。增加强度和令人满意的延展性的最佳组合可提供变形后退火。

图形摘要