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首页> 外文会议>2006 BIMW >Accumulative Roll-Bonding (ARB) of Sheets of Aluminium and its Commercial Alloys AA8006 and AA5754 at Ambient and Elevated Temperatures
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Accumulative Roll-Bonding (ARB) of Sheets of Aluminium and its Commercial Alloys AA8006 and AA5754 at Ambient and Elevated Temperatures

机译：常温和高温下铝及其商业合金AA8006和AA5754的累积滚焊（ARB）

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Mechanical properties and microstructure of twin-roll cast (TRC) pure aluminium, Al-Fe-Mn-Si (AA8006) and Al-Mg (AA5754) alloy sheets ARB processed at ambient and elevated temperatures (200, 250, 300 and 350°C) were investigated. Processing at elevated temperatures results in better bonding but it produces smaller increases in hardness. AA8006 specimens were processed without any problems up to 7 cycles. The alloy AA5754 suffered from severe edge and notch cracking since the first cycle. The strength was evaluated from tensile test and microhardness measurements; the microstructure was examined using light microscopy, and transmission electron microscopy. The microstructure was compared to that of conventionally cold rolled (CCR) specimens with true strain ε of 0.8, 1.6, 2.4 and 3.2 corresponding to the strain induced by 1 to 4 ARB cycles. The work hardening of alloy AA8006 saturated after the 3rd cycle, whereas the hardness of alloy AA5754 increased steadily up to the 5th cycle. Very fine grain structure with large fraction of high angle boundaries was observed in both alloys after two cycles of ARB. The grains were refined to submicrometre and nanometre size (down to 90 nm in alloy AA5754). Intensive post-dynamic recovery was observed in AA8006 specimens. The recovery is less pronounced in the AA5754 alloy with high concentration of solute atoms in solid solution.
机译：双辊铸（TRC）纯铝，Al-Fe-Mn-Si（AA8006）和Al-Mg（AA5754）合金板ARB的机械性能和显微组织C）进行了调查。在高温下加工可获得更好的粘结性，但硬度增加的幅度较小。 AA8006标本经过7个循环处理，没有任何问题。自第一次循环以来，AA5754合金就出现了严重的边缘和缺口裂纹。通过拉伸试验和显微硬度测量来评估强度;使用光学显微镜和透射电子显微镜检查微观结构。将其显微组织与常规冷轧（CCR）试样进行比较，其真实应变ε为0.8、1.6、2.4和3.2，对应于1-4次ARB循环诱发的应变。在第3个循环后，AA8006合金的加工硬化达到饱和，而在第5个循环中，AA5754合金的硬度却稳定增加。经过两次ARB循环后，两种合金均观察到非常细的晶粒结构，且具有很大比例的高角度边界。将晶粒细化至亚微米和纳米尺寸（在AA5754合金中低至90 nm）。在AA8006标本中观察到了强烈的动态后恢复。在固溶体中具有高浓度溶质原子的AA5754合金中，回收率不太明显。

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