Materials Reports 2019, Vol. 33 Issue (z1): 348-352 |
METALS AND METAL MATRIX COMPOSITES |
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Multi-pass Compression Behavior and Microstructure Evolution of AA2195 Aluminum Lithium Alloy |
LEI Lin, YANG Qingbo, ZHANG Zhiqing, FAN Xiangze, LI Xu, YANG Mou, DENG Zanhui
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School of Materials Science and Engineering, Chongqing University, Chongqing 400044 |
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Abstract The hot deformation tests of AA2195 aluminum alloy were conducted on the thermal simulation equipment Gleeble-3500 by multi-pass under cylinder uniaxial compression in the temperature range of 400—450 ℃ ,strain rate of 0.01—0.1 s-1 and a total deformation of 80%. In the multi-pass compression process, the flow behavior and evolution of microstructure were studied by optical microscopy (OM) and electron backscatter diffraction (EBSD) microstructural characterization methods. The results showed that the flow stress of the alloy shows a static softening “peak valley” between the passes, and the softening rate increases with the increase of the compression pass and the temperature. The microstructure evolution among various passes of multi-pass under different deformation conditions show similar law: at the first pass, many substructures are formed; at the second pass, the transformation process of the small angle grain boundary to the large angle grain boundary is predominant, and small equiaxial dynamic recrystallization grains appear at the original grain boundary and the triple junctions; at the third pass, the continuous dynamic crystallization phenomenon is more obvious, the recrystallized grains also grow to varying degrees. At the same time, the high deformation temperature is more conducive to the formation of dynamic recrystallization, and softening effect of the alloy is also better.
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Published: 05 July 2019
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About author:: Science and Engineering of Chongqing University from Sep.2017 to till now. He is currently a professor and doctoral supervisor. He performed collaborative research in Mar.2011—July.2011 in University of Michigan/Ford Motor Company, and in 2012—2013 in RISO National Laboratory, Denmark. He has published more than 10 journal papers, applied 7 national invention patents. His team’s research interests are metal plastic deformation and microstructure characterization; electromagnetic casting; aluminum alloy heat treatment and strengthening; aluminum alloy superplasticity. He is responsible for more than 10 scientific research projects, including the National “863” Projects(“Industrial Preparation and Application of New Lightweight High Performance Aluminum-Lithium Alloys”)and participated in more than 10 research projects. Professor Zhang has trained 4 doctors, more than 10 masters, and dozens of undergraduates.Lin Lei studying for a master’s degree in Chongqing University and under the guidance of Professor Zhang, is mainly engaged in the deformation of the aluminum alloy and the characterization of the microtexture. |
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