Mechanical properties and internal friction of Mg–Zn–Y alloys with a long-period stacking ordered structure at different Y/Zn atomic ratios. Issue 21 (10th November 2015)

• Record Type: Journal Article
• Authors: Wang, Jingfeng; Wu, Zhongshan; Lu, Ruopeng; Chen, Yongliang; Huang, Song; Qin, Dezhao; Yang, Wenxiang; Pan, Fusheng
• Is Part Of: Journal of materials research. Volume 30:Issue 21(2015)
• Page Start: 3354
• Page End: 3362
• Publication Date: 2015-11-10
• Subjects: Mg–Zn–Y alloys, -- LPSO phase structure, -- mechanical properties, -- internal friction; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2015.297
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: 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 P 1 and P 2 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.