Materials Transactions Online

Materials Transactions, Vol.59 No.06 (2018) pp.897-902
© 2018 The Japan Institute of Metals and Materials

Effect of Additive Elements on the Elinvar and Invar Characteristics of Fe-Mn Base Alloys

Kazuyuki Sugawara, Shigehiro Ohnuma and Tsuyoshi Masumoto

Research Institute for Electromagnetic Materials, Tomiya 981-3341, Japan

This study investigated the temperature dependence of the Young’s modulus and the thermal expansion of Fe-26 at%Mn base alloys. The addition of a few % of Ti, Mo, Nb, Zr, Ta, or Hf to the alloys limited the temperature coefficient of Young’s modulus to within ±5 × 10−5/K. In alloys with added Nb, Zr, and Hf, the temperature coefficient of thermal expansion was 1 × 10−5/K or less, whereas the Néel temperature was 380 K or greater. Fe-Mn-based alloys containing a few at% of elements from families 4 and 5 of the periodic table exhibited both Elinvar and Inver characteristics at temperatures up to approximately 380 K. The effect on the properties was shown to be correlated with the number of electrons in the outer shell of the added element and its atomic radius.


(Received 2017/11/07; Accepted 2018/04/12; Published 2018/05/25)

Keywords: Elinvar, Invar, Fe-Mn, antiferromagnetism, Young’s modulus, thermal expansion

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