Improving mechanical properties of age-hardenable Mg–6Zn–4Al–1Sn alloy processed by double-aging treatment. Issue 11 (November 2017)

• Record Type: Journal Article
• Authors: Zhu, Shaozhen; Luo, Tianjiao; Yang, Yuansheng
• Is Part Of: Journal of materials science & technology. Volume 33:Issue 11(2017:Nov.)
• Page Start: 1249
• Page End: 1254
• Publication Date: 2017-11
• Subjects: Magnesium alloy -- Mg–Zn–Al–Sn -- Double-aging treatment -- Mechanical properties; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2017.07.021
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: Microstructure and mechanical properties of a new high-strength Mg–6Zn–4Al–1Sn alloy were investigated. Microstructure of the as-cast Mg alloy exhibited partially divorced characteristics. The dendritic structure of the Mg–6Zn–4Al alloy was significantly refined with the addition of 1% (in weight) Sn, but Mg2 Sn phases were not formed. In addition, an icosahedral quasi-crystal phase was formed in the as-cast Mg–6Zn–4Al–1Sn alloy. It was found that after the double-aging treatment through two different heat treatments on the Mg–6Zn–4Al–1Sn alloy, the precipitates were finer and far more densely dispersed in the matrix compared with single-aged counterpart, resulting in a significant improvement in tensile strength with yield strength, ultimate tensile strength and elongation of 175 MPa, 335 MPa and 11%, respectively.