Dislocation Boundary Structure from Low to Medium Strain of Cold Rolling AA3104 Aluminum Alloy
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RODUCTION
DEFORMATION-INDUCED dislocation boundaries have been the subject of research for several decades. In general, grains in fcc metals with a medium to high stacking fault energy deformed to low and medium strains are subdivided into cell blocks containing ordinary dislocation cells. The cell blocks are defined by extended planar boundaries referred to as geometrically necessary boundaries (GNBs). The dislocation cells inside the cell blocks are defined by boundaries referred to as incidental dislocation boundaries (IDBs).[1,2] Large numbers of studies[3–12] on the evolution of dislocation boundary structure have been carried out, although most of these studies have focused on pure metals. In many of these studies,[6–12] it has been found that there is a good correlation between the grain orientation and the microstructure characteristics. However, few studies on the evolution of the dislocation boundary structure of particle-containing alloys during cold rolling have been reported, although a few studies on aluminum alloys exist.[13,14] ZONGYONG YAO, Ph.D. Student, and ANDREW GODFREY and WEI LIU, Professors, are with the Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Room 2703#, Yifu Building, Beijing 100084, People’s Republic of China. GUANGJIE HUANG, Professor, is with the College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China. QING LIU, Professor, formerly with the Department of Materials Science and Engineering, Tsinghua University, is with the College of Materials Science and Engineering, Chongqing University. Contact e-mail: [email protected] Manuscript submitted May 14, 2008. Article published online April 14, 2009 METALLURGICAL AND MATERIALS TRANSACTIONS A
Due to its good strength, corrosion, and deep draw ability, the aluminum alloy AA3104, which contains many nondeformable second-phase particles, is widely used as a can stock material. It is, therefore, of fundamental importance to investigate the microstructure evolution during cold rolling of this industrially important alloy. In many previous studies of deformation microstructure evolution, samples have been characterized predominantly using the transmission electron microscope (TEM). In the present investigation, we use a combination of electron channeling contrast (ECC) and electron backscattered diffraction (EBSD) techniques to investigate the deformation microstructure in this deformed sample. This combination of techniques has the advantage of allowing orientation measurements to be made over larger areas than in the TEM; thus, quantitative statistics results can be obtained.
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EXPERIMENT
The material used in this investigation is an AA3104 aluminum alloy provided by Southwest Aluminum (Group) Co., Ltd. (Chongqing, China). Starting from the cast ingot, the plates were homogenized and then industrially hot rolled on a reversing mill to a sheet 3.25 mm thick. The hot-rolled plates were then cold rolled to 10, 30, and 50 pct re
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