An Investigation on the Microstructure and Impression Creep Behavior of the Magnesium Alloys

Subject Areas :

Ehsan Kermani ¹ , Farid Biniyazan ² , Behzad Rezaee ³ , Hamid Soleimanimehr ⁴

1 - Department of Mechanical Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
2 - Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 - Department of Material Science and Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
4 - Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

Received: 2020-01-16 Accepted : 2020-04-04 Published : 2020-02-01

Keywords: Microstructure, impression creep, ZE63, ZE41,

Abstract :

Magnesium alloys are important materials in industries because of their low densities. But the problem with these alloys is their lack of creep resistance at high temperatures. In this research, the creep behavior of cast ZE63 and ZE41 magnesium alloys were studied by using the impression creep method. The tests of impression creep were carried out at a temperature of 473 Kelvin and constant punching stress range of 175MPa to 500MPa. Microstructural investigation of magnesium alloys was performed using an optical microscope and X-ray diffraction (XRD). The results of XRD analysis indicated that the structures of both alloys were composed of α-Mg matrix phase accompanied by Mg7Zn3, Mg12RE, and Mg17RE2 intermetallic compounds. Besides, the analysis of the microstructure of deformation zones showed that the creep resistance of ZE63 was higher than ZE41. The higher creep resistance of ZE63 was attributed to the existence of more continuous phases of Mg7Zn3, Mg12RE, and Mg17RE2.

References:

[1] Arun, M. S., and Chakkingal, U. 2019. A constitutive model to describe high temperature flow behavior of AZ31B magnesium alloy processed by equal-channel angular pressing. Materials Science and Engineering: A 754: 659-673.

[2] Yang, F., and Li, J.C. 2013. Impression test—a review. Materials Science and Engineering: R: Reports 74: 233-253.

[3] Peng, L., Yang, F., Nie, J.F. and Li, J.C.M. 2005. Impression creep of a Mg-8Zn-4Al-0.5 Ca alloy. Materials Science and Engineering: A 410: 42-47.

[4] Zhang, Y., Yang, L., Ge, C., Pang, S., Wang, X., Zhang, Z. and Han, Z. 2019. Influence of Ca and Sr Addition on Impression Creep Behavior of Mg-4Al-RE Alloy. Journal of Materials Engineering and Performance 28: 394-403.

[5] Wei, S., Chen, Y., Tang, Y., Zhang, X., Liu, M., Xiao, S., Xiao, S., and Zhao, Y. 2009. Compressive creep behavior of Mg–Sn–La alloys. Materials Science and Engineering: A 508: 59–63.

[6] Chu, S.N.G., Li, J.C.M. 2002. Impression creep; a new creep test.  Materials Science and Engineering: A 322: 23–42.

[7] Li, J., Du, W., Li, S. and Wang, Z. 2010. Tensile and creep behaviors of Mg–5Zn–2.5 Er alloy improved by icosahedral quasicrystal. Materials Science and Engineering: A 527: 1255-1259.