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Mechanical Properties and Microstructure Evolution of Mg-6 wt % Zn Alloy during Equal-Channel Angular Pressing

by 1,2,*, 1 and 3,*
1
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2
Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing 211189, China
3
School of Mechanical Engineering, Yangzhou University, Yangzhou 225009, China
*
Authors to whom correspondence should be addressed.
Metals 2018, 8(10), 841; https://doi.org/10.3390/met8100841
Received: 17 September 2018 / Revised: 7 October 2018 / Accepted: 16 October 2018 / Published: 18 October 2018
Equal-channel angular pressing (ECAP) was performed on a Mg (6 wt %) Zn alloy at temperatures from 160 to 240 °C and the microstructures and mechanical properties were studied using optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and an electronic universal testing machine. The results showed that ECAP was effective for grain refinement and a bi-modal grain structure formed at low temperatures, which was stable during ECAP from 160 to 200 °C. MgZn2 phase and Mg4Zn7 phase were generated during the ECAP process. The mechanical properties remarkably increased after two repetitions of ECAP. However, the strengths could not be further improved by increasing the plastic deformation, but decreased when ECAP was performed between 200 and 240 °C. The mechanical properties of the ECAP Mg-6Zn alloy was determined by a combination of grain refinement strengthening, precipitation hardening, and texture softening. View Full-Text
Keywords: Mg-6 wt % Zn alloy; equal channel angular pressing (ECAP); MgZn2; Mg4Zn7; mechanical property; precipitate Mg-6 wt % Zn alloy; equal channel angular pressing (ECAP); MgZn2; Mg4Zn7; mechanical property; precipitate
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Yan, J.; Qin, Z.; Yan, K. Mechanical Properties and Microstructure Evolution of Mg-6 wt % Zn Alloy during Equal-Channel Angular Pressing. Metals 2018, 8, 841.

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