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Mechanical properties and internal friction of Mg–Zn–Y alloys with a long-period stacking ordered structure at different Y/Zn atomic ratios

Published online by Cambridge University Press:  10 November 2015

Jingfeng Wang*
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Zhongshan Wu
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Ruopeng Lu
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Yongliang Chen
Affiliation:
Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
Song Huang
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Dezhao Qin
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Wenxiang Yang
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
Fusheng Pan
Affiliation:
The State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People's Republic of China
*
a)Address all correspondence to this author. e-mail: jingfengwang@163.com
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Abstract

The mechanical properties and internal friction (damping capacity) of Mg–Zn–Y alloys with a long-period stacking ordered (LPSO) structure at different Y/Zn atomic ratios (2/1, 3/2 or 4/3) in cast and extrusion were investigated. It was found that the as-cast Mg–Zn–Y alloys with different Y/Zn atomic ratios possess a single LPSO phase with the same stable 18R-type structure. Among the three alloys, the alloy with 3/2 atomic ratio yields the highest damping capacity in low- and high-strain amplitude stages. Two damping peaks particularly P1 and P2 are detected in the Mg–Zn–Y alloy with 3/2 atomic ratio at approximately 108 and 220 °C, respectively. These results may be attributed to few solute atoms in Mg matrix and grain boundaries. In addition, the studied alloy with 3/2 atomic ratio exhibits excellent comprehensive properties in as-cast and as-extruded states; this alloy yields an ultimate tensile strength of 346 MPa and maintains a certain damping capacity (Q−1 > 0.01) in extrusion.

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Articles
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Yang-T. Cheng

References

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