NDLI: Effect of Cu Additions on Microstructure, Mechanical Properties and Hot-Tearing Susceptibility of Mg-6Zn-0.6Zr Alloys

Content Provider	Springer Nature Link
Author	Wang, Zhi Li, Yizhou Wang, Feng Song, Jiangfeng Liu, Zheng Mao, PingLi
Copyright Year	2016
Abstract	The microstructures and mechanical properties of Mg-6Zn-xCu-0.6Zr (x = 0, 0.5, 1, 2, 3 wt.%) alloys are investigated. The effect of Cu additions on the hot-tearing susceptibility (HTS) of Mg-6Zn-0.6Zr is also studied using constrained rod casting apparatus equipped with a load cell and data acquisition system. The experimental results indicate that 0.5wt.% Cu addition into the Mg-6Zn-0.6Zr alloy shows the optimum comprehensive properties, i.e., a combination of high strength, high hardness, high hot-tearing resistance and excellent ductility. However, when Cu content reaches 2 and 3wt.%, the deterioration in mechanical properties observed is attributed to the increment in coarsened MgZnCu phase and the continuous networks of intergranular phases in these two alloys. The Cu-free base alloy had a high HTS, which is attributed to its large vulnerable temperature range and coarse grain structure, which easily caused tear propagation. In contrast, the Cu-contained alloys exhibited low HTS are due to their narrow vulnerable temperature ranges and its refined equiaxed grain structure, which effectively accommodated the stress developed during solidification. The hot-tearing fracture surfaces indicate that the hot-tearing initiated and propagated along the grain boundaries with liquid films. The results also suggest that the hot-tearing resistance can apparently be improved by increasing the initial mold temperature.
Starting Page	5530
Ending Page	5539
Page Count	10
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	25
Issue Number	12
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2016-10-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cu addition hot tearing mechanical properties Mg alloys microstructure Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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