Age hardening responses of as-extruded Mg-2.5Sn-1.5Ca alloys with a wide range of Al concentration. (1st February 2020)

• Record Type: Journal Article
• Authors: Huang, Qiuyan; Liu, Yang; Zhang, Aiyue; Jiang, Haoxin; Pan, Hucheng; Feng, Xiaohui; Yang, Changlin; Luo, Tianjiao; Li, Yingju; Yang, Yuansheng
• Is Part Of: Journal of materials science & technology. Volume 38(2020)
• Page Start: 39
• Page End: 46
• Publication Date: 2020-02-01
• Subjects: Magnesium alloys -- Age hardening -- Precipitations -- Dislocations -- Mechanical properties; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2019.06.025
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: This article aims to explore the age hardening responses of both as-extruded and as-aged Mg-2.5Sn-1.5Ca- x Al alloys ( x = 2.0, 4.0 and 9.0 wt%, termed TXA322, TXA324 and TXA329, respectively) through microstructural and mechanical characterization. Results indicate that grain size of as-extruded TXA322, TXA324 and TXA329 alloys were ∼ 16 μm, ∼ 10 μm and ∼ 12 μm, respectively. A number of < a > and < c + a > dislocations were observed in all the as-extruded samples. Guinier – Preston (GP) zones were evidently identified in TXA322 alloy, while only a small number of Mg17 Al12 phases existed in both TXA324 and TXA329 alloys. An aging treatment facilitated the precipitation of a high number density of GP zones within the matrix of TXA322 alloy. In contrast, no obvious nano-precipitates were in as-aged TXA324 alloy. Numerous nano-Mg17Al12 phases were formed through a following aging treatment in TXA329 alloy. In terms of mechanical properties, it is apparent that an increment in ultimate tensile strength of ∼ 46 MPa and ∼ 40 MPa was yielded in peak-aged TXA322 and TXA329 alloys, while no obvious variations in UTS were present in peak-aged TXA324 alloy, in comparison with the as-extruded counterparts.