The Effect of Casting Speed on Microstructure, Microsegregation, and Mechanical Properties of High-Strength Mg-Nd-Zn-Zr Alloy

Journal Article · Fri Mar 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-3878-0· OSTI ID:22970925

Zheng, Xingwei ^[1]; Luo, Peng ^[2]; Dong, Jie ^[3]; Wang, Shiming ^[1]

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1. Shanghai Ocean University, College of Engineering Science and Technology (China)
2. Shanghai Dianji University, Shanghai Collaborative Innovation Center for Heavy Casting/Forging Manufacturing Technology, School of Materials (China)
3. Shanghai Jiaotong University, National Engineering Research Center of Light Alloy Net Forming (China)

High-quality Mg-Nd-Zn-Zr magnesium alloy billets were successfully prepared by direct chill casting. The effect of casting speed on microstructure, microsegregation, and mechanical properties of the Mg-Nd-Zn-Zr alloy was systematically investigated. The results show that the as-cast microstructure is composed of equiaxed α-Mg and Mg{sub 12}Nd. Optimum values of mechanical properties were obtained corresponding to the casting speed of 90 mm/min. An age hardening at 200 °C took a remarkable effect on the mechanical properties of billets. The maximum ultimate tensile strength ~ 323.4 MPa was obtained in the billet undergoing T6 heat treatment. The shapes of concentration curves of various alloying elements (e.g., Nd and Zn) in Mg-Nd-Zn-Zr, as predicted by the Gulliver–Scheil model, resemble reasonably with the shapes measured by electron probe microanalysis.

• OSTI ID: 22970925
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 3 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGE HARDENING
CASTINGS
ELECTRON MICROPROBE ANALYSIS
HEAT TREATMENTS
MAGNESIUM ALLOYS
MICROSTRUCTURE
TENSILE PROPERTIES
ULTIMATE STRENGTH
ZINC