Microstructure and mechanical properties of the As-cast and As-homogenized Mg-Zn-Sn-Mn-Ca alloy fabricated by semicontinuous casting
File(s)
Published version
Author(s)
Lu, Xing
Zhao, Guoqun
Zhou, Jixue
Zhang, Cunsheng
Yu, Junquan
Type
Journal Article
Abstract
In this paper, a new type of low-cost Mg-3.36Zn-1.06Sn-0.33Mn-0.27Ca (wt %) alloy ingot with a diameter of 130 mm and a length of 4800 mm was fabricated by semicontinuous casting. The microstructure and mechanical properties at different areas of the ingot were investigated. The microstructure and mechanical properties of the alloy under different one-step and two-step homogenization conditions were studied. For the as-cast alloy, the average grain size and the second phase size decrease from the center to the surface of the ingot, while the area fraction of the second phase increases gradually. At one-half of the radius of the ingot, the alloy presents the optimum comprehensive mechanical properties along the axial direction, which is attributed to the combined effect of relatively small grain size, low second-phase fraction, and uniform microstructure. For the as-homogenized alloy, the optimum two-step homogenization process parameters were determined as 340 °C × 10 h + 520 °C × 16 h. After the optimum homogenization, the proper size and morphology of CaMgSn phase are conducive to improve the microstructure uniformity and the mechanical properties of the alloy. Besides, the yield strength of the alloy is reduced by 20.7% and the elongation is increased by 56.3%, which is more favorable for the subsequent hot deformation processing.
Date Issued
2018-04-29
Date Acceptance
2018-04-26
Citation
Materials, 2018, 11 (5)
ISSN
1996-1944
Publisher
MDPI (Basel, Switzerland)
Journal / Book Title
Materials
Volume
11
Issue
5
Copyright Statement
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access
article distributed under the terms and conditions of the Creative Commons Attribution
(CC BY) license (http://creativecommons.org/licenses/by/4.0/).
article distributed under the terms and conditions of the Creative Commons Attribution
(CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/29710818
PII: ma11050703
Subjects
homogenization treatment
magnesium alloy
mechanical properties
microstructure
semicontinuous casting
Publication Status
Published
Coverage Spatial
Switzerland