日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 1 (1976),
pp. 22-26

Invar Effect in Antiferromagnetic Cr-Base Binary and Cr-Fe-Base Ternary Alloys Containing 5d Transition Metals

Kazuaki Fukamichi1 and Hideo Saito1

1The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai

Abstract:

Practical Invar alloys are all ferromagnetic, and applications of these alloys are often restricted because of their ferromagnetism. Therefore, research to develop magnetically insensitive Invar alloys has recently received considerable attention. In the present study, physical properties of Cr-base alloys containing small amounts of 5d transition metals have been investigated.
The N´eel temperature of Cr increases with Re, Os, Ir, or Pt content and decreases with Ta or W content.
Some Cr-Fe primary solid solution alloys show very low thermal expansion coefficients below the N´eel temperature, and the temperature range below room temperature, however, makes the alloys impractical. Therefore, we added 5d transition metals to the Cr-Fe alloys to increase the N´eel temperature and found the Invar characteristic around room temperature in some of the Cr-Fe base ternary alloys. These Invar alloys are all antiferromagnetic and the magnetic susceptibilities are very small, showing that the Cr-Fe base ternary Invar alloys containing 5d transition metals are magnetically insensitive in practical applications.


(Received 1975/06/28)

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