Mroz Sebastian, Wierzba Arkadiusz, Stefanik Andrzej, Szota Piotr
Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, Av. Armii Krajowej 19, 42-201 Czestochowa, Poland.
Metalurgia S.A., Świętej Rozalii 10/12, 97-500 Radomsko, Poland.
Materials (Basel). 2020 Nov 27;13(23):5401. doi: 10.3390/ma13235401.
This paper aimed to propose the fabrication of light, Al/Mg/Al multilayered composite. Initially prepared three-layered feedstock was subjected to deformation during four rolling cycles (passes) using the conventional and modified accumulative roll bonding (ARB) processes at 400 °C, thanks to which 24-layered composite materials were produced. The modification of the ARB process was based on the application of the rotational speed asymmetry (asymmetric accumulative roll bonding, AARB). It was adopted that the initial thickness of the composite stack amounted to 3 mm (1 mm for each composite). The rolling was done in the laboratory duo D150 rolling mill with the application of the roll rotational speed asymmetry and symmetry a = 1.0 (ARB) and a = 1.25 and 1.5 (AARB). In this manuscript, it was proved that introducing the asymmetry into the ARB process for the tested Al/Mg/Al composite has an impact on the activation of additional shear bands, which results in higher fragmentation of the structure in comparison to the symmetrical process. Due to the application of the AARB, the reduction of the grain size by 17% was obtained, in comparison to the conventional ARB. Not to mention that at the same time there was an increase in strength of the fabricated multilayered composite.
本文旨在提出轻质Al/Mg/Al多层复合材料的制备方法。最初制备的三层原料在400℃下使用传统和改进的累积叠轧（ARB）工艺在四个轧制周期（道次）中进行变形，由此制备出了24层复合材料。ARB工艺的改进基于转速不对称的应用（不对称累积叠轧，AARB）。采用的复合材料叠层初始厚度为3mm（每层复合材料1mm）。轧制在实验室双辊D150轧机上进行，应用了轧辊转速不对称和对称情况，对称时a = 1.0（ARB），不对称时a = 1.25和1.5（AARB）。在本论文中，已证明在测试的Al/Mg/Al复合材料的ARB工艺中引入不对称性会对额外剪切带的激活产生影响，这导致与对称工艺相比结构的破碎程度更高。由于应用了AARB，与传统ARB相比，晶粒尺寸减小了17%。更不用说与此同时所制备的多层复合材料的强度有所增加。
