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Gradients of Strain to Increase Strength and Ductility of Magnesium Alloys

by Yao Liu 1 and Songlin Cai 2,*
1
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
2
China Electric Power Research Institute, Beijing 100192, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1028; https://doi.org/10.3390/met9101028
Received: 4 August 2019 / Revised: 7 September 2019 / Accepted: 17 September 2019 / Published: 22 September 2019
A strain gradient was produced in an AZ31B magnesium alloy through a plastic deformation of pure torsion at a torsional speed of π/2 per second. Compared with the base material and with the alloy processed by conventional severe plastic deformation, the magnesium alloy provided with a strain gradient possesses high strength preserving its ductility. Microstructural observations show that strain gradient induces the formation of an inhomogeneous microstructure characterized by statistically stored dislocation (SSD) density gradient and geometrically necessary dislocation (GND). GNDs and dislocation density gradient provide extra strain hardening property, which contributes to the improvement of ductility. The combination of SSD density gradient and GND can simultaneously improve the strength and ductility of magnesium alloy. View Full-Text
Keywords: magnesium alloy; strength; ductility; strain gradient; work hardening magnesium alloy; strength; ductility; strain gradient; work hardening
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MDPI and ACS Style

Liu, Y.; Cai, S. Gradients of Strain to Increase Strength and Ductility of Magnesium Alloys. Metals 2019, 9, 1028.

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