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首页> 外文期刊>Materials Science and Engineering >Investigation on microstructure and mechanical properties of Al/Al-Zn- Mg-Cu laminated composite fabricated by accumulative roll bonding (ARB) process
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Investigation on microstructure and mechanical properties of Al/Al-Zn- Mg-Cu laminated composite fabricated by accumulative roll bonding (ARB) process

机译：累积辊压结合法制备Al / Al-Zn-Mg-Cu叠层复合材料的组织和力学性能

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摘要

In this study, an Al/Al-Zn-Mg-Cu laminated composite was successfully produced for the first time by using Al 1050 and a super high strength 7xxx aluminum alloy sheets through accumulative roll bonding (ARB) process at an elevated temperature. In this process after sandwich preparation, in per cycle applied 50% reduction in total thickness. The microstructural investigations after different ARB cycles showed that ARB process led to a fine distribution of the secondary phases and also a relatively remarkable decrease in their particle size in the Al-Zn-Mg-Cu (AZMC) layer. Furthermore, it was observed that all the layers of the ARBed sheets remained relatively straight without any necking or fracture during the plastic deformation in the first two cycles. Also, the macrostructure showed elongated and ultra-fine grains after the fourth cycle in the AZMC and pure Al (PA) layers, respectively. In addition, computer simulation demonstrated strain and stress gradients in the ARBed sheet. The mechanical examinations displayed a significant improvement of elongation and ultimate tensile strength (UTS) values and also microhardness values of the AZMC layer with increasing the ARB cycles. However, the microhardness variations were so slight (< 4%) in the PA layer during the ARB process. Fractographic observations revealed that the fractured surfaces of the PA layers consist of necking as well as dimples and that of the AZMC ones include dimples and partly shear regions after ARB process.
机译：在这项研究中，通过使用Al 1050和超高强度7xxx铝合金薄板，在高温下通过累积辊压粘合（ARB）工艺，首次成功地生产了Al / Al-Zn-Mg-Cu层压复合材料。在此过程中，准备三明治之后，每个周期中总厚度减少50％。在不同的ARB循环后进行的微观结构研究表明，ARB过程导致次生相的精细分布，并且在Al-Zn-Mg-Cu（AZMC）层中其相对较小的粒径减小。此外，观察到在前两个循环的塑性变形过程中，ARB板材的所有层都保持相对平直，没有任何颈缩或断裂。同样，在第四次循环后，分别在AZMC和纯Al（PA）层中，宏观结构显示出细长和超细晶粒。此外，计算机仿真表明ARBed板材中的应变和应力梯度。机械检查显示，随着ARB周期的增加，AZMC层的伸长率和极限抗拉强度（UTS）值以及显微硬度值均得到了显着改善。但是，在ARB过程中，PA层的显微硬度变化非常小（<4％）。断口观察表明，PA层的断裂表面由颈缩和凹坑组成，而AZMC的断裂表面包括凹坑和ARB处理后的部分剪切区域。

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