Effect of Accumulative Roll Bonding (ARB) and Subsequent Aging on Microstructure and Mechanical Properties of 2024 Al Alloy
Effect of Accumulative Roll Bonding (ARB) and Subsequent Aging on Microstructure and Mechanical Properties of 2024 Al Alloy
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DOI：
10.2320/matertrans.mh201512
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发表时间：
2016-05
影响因子：
1.2
通讯作者：
Ruixiao Zheng;T. Bhattacharjee;A. Shibata;N. Tsuji;Chao-Li Ma
中科院分区：
文献类型：
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作者：
Ruixiao Zheng;T. Bhattacharjee;A. Shibata;N. Tsuji;Chao-Li Ma
在这项研究中，块体纳米结构的2024铝合金板材具有最佳的强度和塑性，成功地制备通过一个有效的热机械处理，包括固溶处理，大变形累积轧制复合（ARB）和冷轧（CR），和随后的低温时效。在3次循环ARB和50%CR后，可以清楚地观察到平均晶粒厚度为40 nm的层状边界结构，总等效应变为3.2。ARB+CR处理样品的极限拉伸强度和断裂延伸率分别为599 MPa和1.7%。随后在100°C下低温时效20 h后，极限拉伸强度和断裂伸长率分别变为635 MPa和7%，与冷加工状态相比，同时显示出增加的强度和延展性。讨论了其上级力学性能优异的原因。[doi：10.2320/matertrans.MH201512]
In this study, bulk nanostructured 2024 Al alloy sheets with optimized strength and ductility were successfully prepared through an effective thermo-mechanical process including solution treatment, heavy deformation by accumulative roll bonding (ARB) and cold rolling (CR), and subsequent low temperature aging. A lamellar boundary structure with mean grain thickness of 40 nm could be clearly observed after 3-cycle ARB and 50% CR with total equivalent strain of 3.2. The ultimate tensile strength and elongation to failure of the ARB+CR processed sample were 599 MPa and 1.7%, respectively. After subsequent low temperature aging at 100°C for 20 h, the ultimate tensile strength and elongation to failure became 635 MPa and 7%, respectively, showing simultaneously increased strength and ductility compared to the cold-worked state. The reasons for the superior mechanical properties were discussed. [doi:10.2320/matertrans.MH201512]