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TEMPERATURE SENSITIVITY AND PREDICTION OF THE MECHANICAL BEHAVIORS OF ULTRAFINE GRAINED ALUMINUM UNDER UNIAXIAL COMPRESSION |
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| Authors: | Quanwei Zhan ;Tao Suo ;Cunxian Wang ;Kui Xie ;Zhongbin Tang |
| Institution: | [1]Institute of UA V research, Northwestern Polytechnical University, 127 Youyi Xilu, Xi'an 710072, China; [2]School of Aeronautics, Northwestern Polytechnical University, 127 VouyiXilu, Xi'an 710072, China; [3]Department of Mechanical Engineering, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA; [4]China Electronics Technology Group Corporation No.38 Research Institute, 199 Xiangzhang Avenue, Hefei 230088, China |
| Abstract: | In the present work, we explore the strain hardening behaviors as well as the effect of temperature on the plastic deformation of ultrafine grained aluminum. The temperature sensitivity is determined and compared with that of coarse grained material. The results indicate that the flow stress of ultrafine grained aluminum displays enhanced sensitivity to temperature. The reduction in activation volume is suggested to be the major reason for the enhanced temperature sensitivity as grain size is refined into the sub-micrometer regime. Finally, a phenomenological constitutive model is proposed to describe the post-yield response of ultrafine grained aluminum. |
| Keywords: | ultrafine grained aluminum compressive behavior temperature sensitivity strain hardening behavior constitutive relation |
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