Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-27T17:28:54.500Z Has data issue: false hasContentIssue false
  • English
  • Français

Microfracture Test of Mg12ZnY Intermetallic Compound in Mg-Zn-Y Alloys

Published online by Cambridge University Press:  15 March 2011

Hajime Yoshimura ,
Shun Matsuyama ,
Mitsuhiro Matsuda ,
Masaaki Otsu ,
Kazuki Takashima  and
Yoshihito Kawamura
Hajime Yoshimura
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, Japan
Shun Matsuyama
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, Japan
Mitsuhiro Matsuda
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, Japan
Masaaki Otsu
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, Japan
Kazuki Takashima
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, Japan
Yoshihito Kawamura
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, Japan
Get access

Abstract

A Mg-Zn-Y alloy including a Mg12ZnY intermetallic compound exhibits excellent mechanical properties as compared to conventional magnesium alloys. The superior mechanical properties of this alloy seem to originate from the Mg12ZnY intermetallic compound; however, the mechanical properties of Mg12ZnY itself have not yet been fully investigated owing to the small size of this compound. In this study, a microfracture test was performed to investigate the fracture properties of the Mg12ZnY intermetallic compound. The material used in this test was a Mg88Zn5Y7 alloy. Micro-sized cantilever specimens composed of Mg12ZnY, with dimensions of 10 × 20 × 50 μm3, were prepared selectively isolated from the Mg88Zn5Y7 alloy using focused ion beam (FIB) machining. Notches with a width of 0.5 μm and a depth of 5 μm were also introduced into the micro-sized specimens. Microfracture tests were performed using a mechanical testing machine for microscale materials. The fracture toughness values (KQ) of Mg12ZnY were 1.2−3.0 MPam1/2. TEM observations indicated that the KQ values were dependent on the crack orientation in Mg12ZnY, with the higher KQ values correlating with cracks propagating parallel to the c-axis of Mg12ZnY. This suggests that the fracture toughness of Mg-Zn-Y alloys can be improved by controlling the orientation of the Mg12ZnY compound.

Keywords

fracturetoughnessMg
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n05-40
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Somekawa, H. and Mukai, T., Scr. Mater. 53, 541 (2005).Google Scholar
2. Somekawa, H., Singh, A. and Mukai, T., J. Mater. Res. 22, 965 (2007).Google Scholar
3. Yoshimoto, S., Yamasaki, M. and Kawamura, Y., Mater. Trans. 47, 959 (2006).Google Scholar
4. Abe, E., Kawamura, Y., Hayashi, K. and Inoue, A., Acta Mater. 50, 3845 (2002).Google Scholar
5. Padezhnova, E. M., Melnik, E. V., Miliyevskiy, R. A., Dobatkina, T. V. and Kinzhibalo, V. V., Russ. Metall. (Metally) (Engl. Transl.) 4, 185 (1982).Google Scholar
6. Hagihara, K., Yokotani, N. and Umekoshi, Y., Intermetallics 18, 267 (2010).Google Scholar
7. Takashima, K. and Higo, Y., Fatig. Fract. Eng. Mater. Str. 28, 703(2005).Google Scholar
8. Okamura, H., Introduction to Linear Fracture Mechanics, (Baifukan, Tokyo, 1976), p. 218(in Japanese).Google Scholar
9. Yamaguchi, T., Saito, K. and Kawamura, Y., J. JILM 57, 571 (2007).Google Scholar