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Strengthening Effect of Extruded Mg-8Sn-2Zn-2Al Alloy: Influence of Micro and Nano-Size Mg2Sn Precipitates

by Weili Cheng 1,2,3,*, Yang Bai 3, Lifei Wang 1,3, Hongxia Wang 1,3, Liping Bian 1,3 and Hui Yu 4,*
1
Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China
2
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
3
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
4
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China
*
Authors to whom correspondence should be addressed.
Materials 2017, 10(7), 822; https://doi.org/10.3390/ma10070822
Received: 26 June 2017 / Revised: 13 July 2017 / Accepted: 13 July 2017 / Published: 18 July 2017
In this study, Mg-8Sn-2Zn-2Al (TZA822) alloys with varying Mg2Sn contents prior to extrusion were obtained by different pre-treatments (without and with T4), and the strengthening response related to micro and nano-size Mg2Sn precipitates in the extruded TZA822 alloys was reported. The results showed that the morphology of nano-size Mg2Sn precipitates exhibits a significant change in basal plane from rod-like to spherical, owing to the decrement in the fraction of micro-size particles before extrusion. Meanwhile, the spherical Mg2Sn precipitates provided a much stronger strengthening effect than did the rod-like ones, which was ascribed to uniform dispersion and refinement of spherical precipitates to effectively hinder basal dislocation slip. As a consequence, the extruded TZA822 alloy with T4 showed a higher tensile yield strength (TYS) of 245 MPa, ultimate tensile strength (UTS) of 320 MPa and elongation (EL) of 26.5%, as well as a lower degree of yield asymmetry than their counterpart without T4. Detailed reasons for the strengthening effect were given and analyzed. View Full-Text
Keywords: Mg-Sn alloy; extrusion; microstructure; precipitation; strengthening Mg-Sn alloy; extrusion; microstructure; precipitation; strengthening
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MDPI and ACS Style

Cheng, W.; Bai, Y.; Wang, L.; Wang, H.; Bian, L.; Yu, H. Strengthening Effect of Extruded Mg-8Sn-2Zn-2Al Alloy: Influence of Micro and Nano-Size Mg2Sn Precipitates. Materials 2017, 10, 822.

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