On the New Elinvar-type Alloy “Moelinvar” in the Ternary System of Cobalt, Iron and Molybdenum

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  • Co-Fe-Mo系新恒弾性合金“モエリンバー”について
  • Co-Fe-Moケイ シン コウ ダンセイ ゴウキン モエリンバー ニ ツイテ
  • On the New Elinvar-type Alloy “Moelinvar” in the Ternary System of Cobalt, Iron and Molybdenum

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Abstract

Thermal expansion coefficient, rigidity modulus and its temperature coefficient were measured for the alloys containing 45 to 80 per cent of cobalt, less than 25 per cent of molybdenum and the rest of iron. The least coefficient of linear expansion in the temperature range 20° to 50° was 5.70×10−6 which was found in an alloy containing 55 per cent of cobalt and 12.5 per cent of molybdenum. The temperature coefficient of rigidity modulus in the same temperature range was generally negative. However, as the compositions approached the ones, at which the thermal expansion coefficient showed its least value, the absolute value of the coefficient diminished, became zero, changed its sign; and reached a positive maximum value (+14.6×10−5) at compositions corresponding to the ones for the least expansion coefficient. Thus, it will be shown that there are certain composition ranges in this system in which the alloys show elinvar-type properties, and those alloys were named “Moelinvar”. Further, the rigidity modulus at 20° was also determined to get the results that the modulus showed a maximum value (9.89×105 kg/cm2) at the composition containing 45 per cent of cobalt and 15 per cent of molybdenum, and a minimum value (6.08×105 kg/cm2) at the composition of 65 per cent of cobalt and 10 per cent of molybdenum.

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