Abstract
Adiabatic shear localization plays an important role in the deformation and failure of ultrafine grained 6061 aluminum alloy processed by friction stir processing. To understand the effects of temperature and strain on adiabatic shear localization in the ultrafine grained 6061 aluminum alloy, it has been investigated dynamic mechanical behavior of ultrafine grained 6061 aluminum alloy under the controlled shock loading experiments. Deformation characteristics and microstructures in the shear band were performed by optical microscopy and transmission electron microscopy. The shear band in the ultrafine grained aluminum alloy is a long and straight band distinguished from the matrix. The width of the shear band decreases with increasing nominal strain. The results show that the grains in the boundary of the shear band are highly elongated along the shear direction and form the elongated cell structures (0.2 μ in width), and the core of the shear band consists of a number of recrystallized equiaxed grains 0.2-0.3 μ in diameters and the second phases distribute in both the boundary and the inner of the equiaxed new grains. The calculated temperature in the shear band is about 692 K. Rotational dynamic recrystallization mechanism is responsible for the formation of the microstructure in the shear band.
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Acknowledgments
This work was financial supported by State Key Laboratory of Powder Metallurgy, Central South University, by National Natural Science of China (No. 51771231), and by the Freedom Explore Program of Central South University (No. 2017zzts426). The authors would like to express their sincere thanks to Professor M. A. Meyers at University of California, San Diego, for good suggestions and help. The authors would like to express their sincere thanks to Professor Yang Wang and Yu Wang at University of Science and Technology of China and Professor Xiang Zan at Hefei University of Technology for dynamic testing.
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Ma, R., Wang, B., Zhang, X. et al. Adiabatic Shear Localization and Microstructure in Ultrafine Grained Aluminum Alloy at Cryogenic Temperature. J. of Materi Eng and Perform 27, 1217–1223 (2018). https://doi.org/10.1007/s11665-018-3157-5
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DOI: https://doi.org/10.1007/s11665-018-3157-5