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Title: | Investigation on the enhanced maximum strain rate sensitivity (m) superplasticity of Mg-9Li-1Al alloy by a two-step deformation method | Authors: | Yang, HP Zhang, X Chen, P Fu, MW Wang, GC To, S |
Issue Date: | 9-Sep-2019 | Source: | Materials science and engineering. A, Structural materials : properties, microstructure and processing, 9 September 2019, v. 764, 138219 | Abstract: | A two-step superplastic deformation (SPD) approach was employed for the SPD of Mg-9Li-1Al (LA91) alloy. In the first SPD step, the constant velocity (Constv) or constant strain rate (CSR) SPD was adopted with the outcome elongation ranging from 50 to 250%. The maximum strain rate sensitivity (Maxm) SPD, in which the maximum m value is always maintained, was then employed in the second SPD step. The results show that the two-step SPD can greatly enhance the superplasticity of LA91 alloy. The largest elongation of 621.1% was obtained by CSR-Maxm SPD with the pre-elongation of 250%, which is even better than the results of single-step Maxm SPD by using grain-refined materials. In addition, the mechanisms of the two-step SPD are discussed and an in-depth understanding of the SPD of LA91 alloy is obtained. This research thus provides a feasible method for efficiently enhancing the plasticity of Mg-Li based alloys for making complex parts and structures with complicated local and multi-scaled features. | Keywords: | Constant strain rate SPD Constant velocity SPD Maximum strain rate sensitivity (m) SPD Mg-Li alloy Two-step superplastic deformation |
Publisher: | Elsevier | Journal: | Materials science and engineering. A, Structural materials : properties, microstructure and processing | ISSN: | 0921-5093 | EISSN: | 1873-4936 | DOI: | 10.1016/j.msea.2019.138219 | Rights: | © 2019 Elsevier B.V. All rights reserved. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Yang, H. P., Zhang, X., Chen, P., Fu, M. W., Wang, G. C., & To, S. (2019). Investigation on the enhanced maximum strain rate sensitivity (m) superplasticity of Mg-9Li-1Al alloy by a two-step deformation method. Materials Science and Engineering: A, 764, 138219 is available at https://doi.org/10.1016/j.msea.2019.138219. |
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