Microstructures and tensile properties of a twin roll cast and heat-treated Mg–2.4Zn–0.1Ag–0.1Ca–0.1Zr alloy

• Published in: Scripta materialia Vol. 64; no. 4; pp. 335 - 338
• Main Authors: Mendis, C.L., Bae, J.H., Kim, N.J., Hono, K.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-02-2011
• Subjects: Constraining; Elongation; Formability; Heat treatment; Hot rolling; Magnesium alloys; Magnesium base alloys; Microstructure; Precipitates; Precipitation; Precipitation hardening; Twin roll casting; Yield strength; Formability; Precipitation hardening; Magnesium alloys; Twin roll casting
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2010.10.031

An Mg–2.4Zn–0.1Ag–0.1Ca–0.1Zr alloy sheet, with a tensile yield strength of 316
MPa, an ultimate tensile strength of 342
MPa and an elongation of 17%, has been processed by twin roll casting (TRC), hot rolling and heat treatment. The high yield strength has been attributed to a uniform distribution of fine rod-like precipitates of MgZn
2 phase. The TRC and hot-rolled sheet also showed an exceptionally high stretch formability with a limiting dome height much larger than those of other Mg alloys.