Several studies had been performed on accumulative roll bonding (ARB) for AA1050; however, most of them were conducted at room temperature. Here, the ARB process was performed on AA1050 plates through nine cycles at elevated temperature. An innovation introduced a new parameter (\(\frac{UTS\times El.}{\varepsilon }\)) to compare the strength-elongation balance between the present study and previous works. Also, as another parameter, the toughness was compared. Comparing these parameters with previous works showed that the considered samples in the present study performed 14 to 63% better than the other samples, so they were more industrially favorable in terms of mechanical behavior and performance. ARB process at elevated temperature may slightly lead to grain growth compared to room/cryogenic temperature, but creates a better elongation, which ultimately leads to a better balance of the strength-elongation parameter. The results showed that the effect of inter-cycle heating was found significant on microstructural evolution and mechanical behavior. Upon five cycles of the process, the grain size was decreased from 35 to 1.8 μm. The yield strength and ultimate strength increased up to 305% and 94%, respectively. Microhardness test showed that warm ARB reduces inhomogeneity factor in the thickness after 3 cycles. Fractography by SEM showed that the sample failed through shear ductile rupture and that the dimples became smaller, more elongated, and shallower onto the failure surface as the number of ARB cycles increased. In short, the warm process is preferred to the cold process to achieve better mechanical performance and toughness.

Graphic Abstract

中文翻译：

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热堆积胶合AA1050片材的高强度-伸长率平衡

已经对 AA1050 的累积滚压粘合 (ARB) 进行了多项研究；然而，其中大部分是在室温下进行的。在此，ARB 工艺在 AA1050 板上通过 9 个循环在升高的温度下进行。一项创新引入了一个新参数 ( \(\frac{UTS\times El.}{\varepsilon }\)) 来比较本研究和以前工作之间的强度-伸长率平衡。另外，作为另一个参数，比较了韧性。将这些参数与以前的工作进行比较表明，本研究中考虑的样品比其他样品的性能好 14% 到 63%，因此它们在机械性能和性能方面在工业上更有利。与室温/低温温度相比，高温下的 ARB 工艺可能会略微导致晶粒生长，但会产生更好的伸长率，最终导致强度-伸长率参数的更好平衡。结果表明，循环间加热对微观结构演变和机械行为的影响显着。在该过程的五个循环中，晶粒尺寸从 35 减小到 1.8 μm。屈服强度和极限强度分别提高了 305% 和 94%。显微硬度测试表明，热 ARB 在 3 次循环后降低了厚度的不均匀性因素。SEM 的断口分析表明，随着 ARB 循环次数的增加，样品通过剪切韧性断裂而失效，并且凹痕变得更小、更细长且在破坏表面上更浅。总之，温加工优于冷加工，以获得更好的机械性能和韧性。随着 ARB 循环次数的增加，破坏表面的深度变浅。总之，温加工优于冷加工，以获得更好的机械性能和韧性。随着 ARB 循环次数的增加，破坏表面的深度变浅。总之，温加工优于冷加工，以获得更好的机械性能和韧性。

图形摘要