Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-24T14:51:38.387Z Has data issue: false hasContentIssue false

Effect of Microstructure on Cold Workability of Ni3Si base Multi-Phase Intermetallic Alloys

Published online by Cambridge University Press:  07 March 2011

Yasuyuki Kaneno
Affiliation:
Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Yasuyuki Matsuoka
Affiliation:
Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Takayuki Takasugi
Affiliation:
Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Get access

Abstract

The effect of microstructure on cold-rolling workability and tensile properties of Ni3Si (L12)−Ni3Ti (D024)−Ni3Nb (D0a) multi-phase intermetallic alloys was investigated. The cast alloys with different microstructures containing the D024 phase and/or the D0a phase particles in the L12 matrix were homogenized and then cold rolled. For the alloys with the microstructure consisting of coarse plate-like D024 particles in the L12 matrix, serious cracks initiated at the coarse D024 particles in the early stage of the cold rolling process and then propagated, resulting in failure of the rolled plate. On the contrary, for the alloys with the microstructure consisting of fine needle-like D024 precipitates and/or granular-shaped D0a particles, these second phase particles did not spoil the cold workability, leading to successful cold rolling to 90 % reduction. After 90 % cold rolling, the rolled sheets were fully recrystallized at 1173 K for 1 h, resulting in the formation of a fine-grained microstructure. The room-temperature tensile strength and the yield stress of the recrystallized sheet were remarkably enhanced compared with that of the unrolled alloys, possibly due to the fine-grained microstructure as well as the particle hardening. Also, the high-temperature tensile strength and the elongation were improved in the recrystallized sheets compared to an L12 single-phase Ni3(Si,Ti) alloy sheet. Consequently, it was found that the cold rolling and annealing process was beneficial to improve the tensile properties for the present multi-phase intermetallic alloys.

Type
Research Article
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] Takasugi, T., Nagashima, M., Izumi, O., Acta Metall. Mater., 38, 747(1990).Google Scholar
[2] Kaneno, Y., Myoki, T., Takasugi, T., Int. J. Mater. Res., 99, 1229(2008).Google Scholar
[3] Ohira, K., Kaneno, T., Takasugi, T., J. Mater. Sci., 39, 2295(2004).Google Scholar
[4] Ohira, K., Kaneno, Y., Takasugi, T., Mater. Sci. Eng. A, 399, 332(2005).Google Scholar
[5] Ohira, K., Kaneno, Y., Tsuda, H., Takasugi, T., Intermetallics, 14, 367(2006).Google Scholar
[6] Fujita, M., Kaneno, Y., Takasugi, T., Mater. Sci. Eng. A, 476, 112(2008).Google Scholar
[7] Hagihara, K., Nakano, T., Umakoshi, Y., Acta Mater., 51, 2623(2003).Google Scholar
[8] Hagihara, K., Nakano, T., Umakoshi, Y., Acta Mater., 48, 1469(2000).Google Scholar