Hostname: page-component-76fb5796d-45l2p Total loading time: 0 Render date: 2024-04-26T07:50:43.740Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructures and thermoelectric power of the higher manganese silicide alloys

Published online by Cambridge University Press:  21 March 2011

Kimiko Kakubo ,
Yoshisato Kimura  and
Yoshinao Mishima
Kimiko Kakubo
Affiliation:
Tokyo Institute of Technology, Department of Materials Science and Engineering, 4259 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan
Yoshisato Kimura
Affiliation:
Tokyo Institute of Technology, Department of Materials Science and Engineering, 4259 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan
Yoshinao Mishima
Affiliation:
Tokyo Institute of Technology, Department of Materials Science and Engineering, 4259 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan
Get access

Abstract

In the present work, we investigate microstructures and thermoelectric power of the binary higher manganese silicide (hereafter denoted as HMS) base alloys prepared by ingot metallurgy, i.e., arc-melting in an Ar gas atmosphere. Alloys with 63.5, 64.0 and 64.5 at% Si have a small amount of second phase, either the primary metallic MnSi phase or Si solid solution (hereafter denoted as (Si)). A slight revision is thereby made on the HMS single phase region of the Mn-Si binary phase diagram. The presence of MnSi seems to reduce the thermoelectric power of the HMS, while that of (Si) enhances it. An alloy having the HMS/(Si) eutectic microstructure, 67.9at%Si, shows the highest thermoelectric power in the Mn-Si binary alloys examined. Moreover, effect of doping the p-type elements, Fe and Cr, on the thermoelectric power and microstructural features is also investigated for a 63.5at%Si alloy which consists mostly of HMS phase with a small amount of (Si) phase. It is shown that both elements, especially 0.5 at% Cr addition, enhance the thermoelectric power of the alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N2.9.1
Copyright
Copyright © Materials Research Society 2001

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.)

Footnotes

*

Graduate Student. kakubo@materia.titech.ac.jp

References

REFERENCES

[1] Korshunov, V.A. and Gel'd, P.D., Fiz. Metal. matalloved 11, vol.6 (1961)Google Scholar
[2] Massalski, T.B., Binary Alloys Phase Diagrams, Second Edition, 2 (1990)Google Scholar
[3] Riffel, M., Groβ, E., Rtohrer, U., Mater, J.. Sci. Mater. in ELECTRON. 6 (1995)Google Scholar
[4] Kimura, Y., Shindo, K., Ohta, Y. and Mishima, Y., Proc. On the Intn'l Federation of Heat Treatment and Surface Engineering Congress, vol.2, Institute of Materials Engineering Australasia Ltd, (2000), 169–176.Google Scholar