反強磁性インバー型Mn-Ge合金の諸特性におよぼす貴金属の影響

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  • The Influence of Noble Metals on the Properties of Antiferromagnetic Invar-Type Mn-Ge Alloys
  • ハン キョウジセイ インバーカタ Mn Ge ゴウキン ノ ショ トクセイ ニ

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The thermal expansion, magnetic property, hardness and workability were investigated for Mn-22%Ge based ternary ε phase alloys containing noble metals in the groups VII A, VIII and I B in the periodic table. In thermal expansion curves of the ternary alloys there appear minima corresponding to the Néel point of the ε phase, showing the Invar characteristics below this temperature. The thermal expansion coefficients of the ternary alloys in the vicinity of room temperature show zero or a negative value. The spontaneous volume magnetostriction of Mn-22%Ge-0.9%Ir, 1.7%Ag and 0.9%Au alloys at 77 K is about 1.3×10−2, and it is hardly affected by the kind of additional element and nearly equal to that of Mn-22%Ge binary alloy and Invar-type Fe-Ni or Fe-Pt alloys. The magnetization of the ternary alloys shows almost the same temperature dependence as that of Mn-22%Ge binary alloy which shows a parasitic ferromagnetism. The magnetization at T⁄TN=0.65 decreases with increase of the additional elements except for Ag. The Néel point of the ε phase is scarcely affected by the third elements except for Ir, Pt and Re.<BR>The Vickers hardness of almost all ternary alloys containing the noble metals less than 2 percent shows a value lower than that of Mn-Ge alloys, and they are superior in machinabilities such as cutting and forging to the binary alloys.

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