Hostname: page-component-8448b6f56d-dnltx Total loading time: 0 Render date: 2024-04-25T05:59:09.880Z Has data issue: false hasContentIssue false
  • English
  • Français

Room Temperature Ductility of B2-Type CoZr Intermetallic Compounds

Published online by Cambridge University Press:  26 February 2011

Yasuyuki Kaneno ,
Takayuki Takasugi ,
Mitsuhiko Yoshida  and
Hiroshi Tsuda
Yasuyuki Kaneno
Affiliation:
kaneno@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, Graduate School of Engineering, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 5998531, Japan
Takayuki Takasugi
Affiliation:
takasui@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, Graduate School of Engineering, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 5998531, Japan
Mitsuhiko Yoshida
Affiliation:
myoshida@miyagi-ct.ac.jp, Miyagi National College of Technology, Department of Materials Science and Engineering, Natori, Miyagi 9811239, Japan
Hiroshi Tsuda
Affiliation:
tsuda@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, Graduate School of Engineering, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 5998531, Japan
Get access

Abstract

B2 (CsCl) CoZr intermetallic alloys with different chemical compositions were hot-rolled and subsequently recrystallized to evaluate tensile properties and rolling workability. Co-49.0Zr, -49.5Zr and -50.0Zr alloys showed the B2-matrixed microstructure containing C15 Co2Zr dispersions, while Co-50.5Zr and -51.0Zr alloys showed the B2-matrixed microstructure containing C16 CoZr2 dispersions. These homogenized ingots were successfully hot-rolled without edge cracks, except for the Co-51.0Zr alloy. The tensile tests revealed that the Co-49.5Zr, -50.0Zr and -50.5Zr alloys exhibited a notable tensile ductility at room temperature as well as at elevated temperatures. Moreover, the recrystallized CoZr alloys were cold-rolled up to 70% reduction without intermediate annealing. It was also found that tensile ductility was most prominent in the Co-50.0Zr alloy with the least volume fraction of second phase dispersions in the investigated alloys, suggesting that the B2 phase of CoZr was inherently ductile. Deformation microstructures were characterized by means of XRD and TEM observations. Mechanisms responsible for the observed large tensile ductility of the CoZr alloys were discussed, on the basis of the observed deformation microstructures.

Keywords

ductilitycompoundcold working
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II06-11
Copyright
Copyright © Materials Research Society 2007

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

1. Gschneidner, K.A. Jr., Russell, A.M., Pecharsky, A.O., Morris, J.R., Zhang, Z., Lograsso, T., Hsu, D., Lo, C.C.H., Ye, Y., Slager, A.J., Kesse, D.C., Nature Mater. 2, 587 (2003).Google Scholar
2. Yamaguchi, T., Kaneno, Y., Takasugi, T., Scripta Mater. 52, 39 (2005).Google Scholar
3. Yoshida, M., Takasugi, T., Phil Mag. A68, 401 (1993).Google Scholar
4. Baker, I., Munroe, P.R., High Temperature Aluminides and Intermetallics, ed. by S.H. Whang, C.T. Liu, D.P. Pope, J.O. Stiegler J.O, TMS, Warrendale (1990), p.425.Google Scholar
5. Lall, C., Loretto, M.H., Harris, I.R., Acta Metall. 26, 1631 (1978).Google Scholar
6. François, A., Veyssière, P., Intermetallics 2, 9 (1994).Google Scholar
7. Nakamura, M., Sakka, Y., J. Mater. Sci. 23, 4041 (1988).Google Scholar