Elastic Properties and Thermal Expansion of Antiferromagnetic Mn-Ge-M (M=Zr or Nb) Alloys

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  • Mn-Ge-M(M=Zr,Nb)系反強磁性合金の弾性特性および熱膨張特性
  • Mn Ge M M Zr,Nb ケイ ハン キョウジセイ ゴウキン ノ ダンセ

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Young’s modulus, the thermal expansion and the magnetization in the temperature range of 120-670 K and the crystal structures at room-temperature were investigated for Mn-Ge base ternary alloys containing Zr or Nb less than 16% with β, γ, ε and their mixture phases. Each characteristic shows peculiar changes corresponding to the β\ ightleftarrowsε phase transformation point Tt, the Néel point of the antiferromagnetic ε-phase TN(ε) and that of γ-phase TN(γ) on each temperature variation curve. The Elinvar characteristics were obtained in the temperature range between Tt and TN(ε) and/or below the TN(γ). Invar characteristics were observed below TN(ε) for the alloys having an ε-rich phase. These ternary alloys were easily cut by a normal lathe in all of the phases, and the forgeability was excellent in the γ-phase.

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