Next Article in Journal
Crystal Structures and High-Temperature Vibrational Spectra for Synthetic Boron and Aluminum Doped Hydrous Coesite
Previous Article in Journal
TMP-SSurface: A Deep Learning-Based Predictor for Surface Accessibility of Transmembrane Protein Residues
Open AccessArticle

Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

1
Key Laboratory of Lightweight Structural Materials Liaoning Province, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
3
Hubei Province Key Laboratory of Advanced Welding Technology, Xiaogan 432000, China
4
Prospective Technology Department, The CITIC Dicastal Institute, Qinhuangdao 066011, China
5
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(12), 641; https://doi.org/10.3390/cryst9120641
Received: 11 November 2019 / Revised: 24 November 2019 / Accepted: 25 November 2019 / Published: 3 December 2019
The solidification and tensile deformation behaviors of rheo-cast AZ91-Sn alloys were revealed to study the effects of Sn alloying on improvement of AZ91 alloy’s mechanical properties. Two kinds of Mg17Al12 phases precipitated from the supersaturated magnesium matrix during rheo-solidification were observed: coarse discontinuous precipitates (DP) at grain boundaries and small-sized continuous precipitates (CP) inside grains. With increasing Sn content, the amount of Mg17Al12 phases was increased whilst the amount of Al atoms in the matrix was decreased. Due to the higher melting point of Mg2Sn than Mg17Al12, Mg2Sn precipitated earlier from the melt, and therefore provided heterogeneous nuclei for Mg17Al12 during the eutectic reaction. Due to grain refinement and solid solution strengthening, AZ91-2.4Sn (mass%) gained 52% increase in tensile strength and 93% increase in elongation compared with pure AZ91 alloy. The higher-density twins and microcracks induced by Sn alloying relaxed stress concentration during plastic deformation, so the fracture mode was transformed from cleavage fracture of pure AZ91 alloy to ductile fracture of AZ91-Sn alloys. View Full-Text
Keywords: rheo-cast; solidification; AZ91 alloy; stannum; mechanical properties rheo-cast; solidification; AZ91 alloy; stannum; mechanical properties
Show Figures

Figure 1

MDPI and ACS Style

Tie, D.; Zhang, B.; Yan, L.; Guan, R.; Ji, Z.; Liu, H.; Zhang, D.; Liu, D.; Chen, M. Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys. Crystals 2019, 9, 641.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop