Accumulative roll bonding of aluminum alloys 2219/5086 laminates: Microstructural evolution and tensile properties
Accumulative roll bonding of aluminum alloys 2219/5086 laminates: Microstructural evolution and tensile properties
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DOI：
10.1016/j.matdes.2011.11.015
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发表时间：
2012-04-01
影响因子：
8.4
通讯作者：
Chattopadhyay, K.
中科院分区：
文献类型：
--
作者：
Roy, Shibayan;Nataraj, B. R.;Chattopadhyay, K.
研究了AA 2219和AA 5086异种铝合金累积叠轧复合过程中的组织演变过程。将两种合金夹在中间作为交替层，并在300摄氏度下轧制多达8道次，每道次降低50%的高度。在ARB的8次通过之后，实现了连续层之间的强结合，伴随着显著的晶粒细化（类似于200-300 nm）。该工艺方案成功地将两种合金之间的等应变条件维持了6个循环。之后，AA 5086层的断裂和破碎主导了组织演变。通过沿着轧制方向的室温拉伸试验，与两种起始合金板相比，评价8道次ARB处理的材料的机械性能。8道次ARB处理的材料的强度介于两种起始合金的强度之间，而塑性在ARB之后比两种组成起始合金的塑性降低。这些机械性能的差异归因于各个层的微观结构方面和破碎过程。(C)2011爱思唯尔有限公司保留所有权利。
The present study describes the course of microstructure evolution during accumulative roll bonding (ARB) of dissimilar aluminum alloys AA2219 and AA5086. The two alloys were sandwiched as alternate layers and rolled at 300 degrees C up to 8 passes with 50% height reduction per pass. A strong bonding between successive layers accompanied by substantial grain refinement (similar to 200-300 nm) is achieved after 8 passes of ARB. The processing schedule has successfully maintained the iso-strain condition up to 6 cycles between the two alloys. Afterwards, the fracture and fragmentation of AA5086 layers dominate the microstructure evolution. Mechanical properties of the 8 pass ARB processed material were evaluated in comparison to the two starting alloy sheets via room temperature tensile tests along the rolling direction. The strength of the 8 pass ARB processed material lies between that of the two starting alloys while the ductility decreases after ARB than that of the two constituent starting alloys. These differences in mechanical behavior have been attributed to the microstructural aspects of the individual layer and the fragmentation process. (C) 2011 Elsevier Ltd. All rights reserved.