Thermal Expansion and Elastic Properties of Mn-Ge-Fe Alloys

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  • Mn-Ge-Fe合金の熱膨張と弾性特性
  • Mn Ge Fe ゴウキン ノ ネツ ボウチョウ ト ダンセイ トクセイ

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Abstract

Young’s modulus, thermal expansion and magnetization at 120-700 K and crystal structure at room temperature were investigated for annealed Mn-Ge-Fe alloys with various crystal structures such as β+γ, γ+ε and ε phases. Young’s modulus vs temperature curves of the ternary alloys consisting of β+γ and of γ phase show a reversible change at a heating and cooling rate of about 27.8×10−3 K/s, and have distinct minimum and maximum corresponding to the Néel point of γ phase TN(γ) and β\ ightleftarrowsγ reversible transformation point Tt below about 10 at%Fe, and the alloys containing Fe above the same amount show only TN(γ). The Elinvar characteristics appears around the temperatures which correspond to a minimum or a maximum of Young’s modulus vs temperature curves. However, Young’s modulus of ternary alloys consisting of γ+ε and of ε phases shows minimum point at TN(ε) or TN(γ), and the Elinvar characteristics around these temperatures is weakened rapidly with increasing Fe content.<BR>The composition range with about zero or −20×10−5 of the temperature coefficient of Young’s modulus is relatively narrow and extends to the composition of Fe-70 at%Mn. This composition area has no relation to that of Fe-Mn-Ge ternary alloys reported previously.

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