日本金属学会誌

J. Japan Inst. Metals, Vol. 41, No. 9 (1977),
pp. 961-964

Effect of Heat Treatment on the Strain Gauge Factor of the Fe-Cr-Co System

Hakaru Masumoto1 and Naoji Nakamura1

1The Research Institute of Electric and Magnetic Alloys, 2-1-1, Yagiyama-minami, Sendai

Abstract:

Fe-Cr-Co alloys containing less than 30% chromium and less than 70% cobalt were heated in vacuum over the temperature range of 500∼1000°C for 1 h and then furnace-cooled after cold-drawing by about 98% reduction in area. Measurements of the strain gauge factor and electrical properties at room temperature were carried out for the alloys.
Generally, with increasing annealing temperature, the strain gauge factors of the Fe-Cr-Co alloys decreased gradualy to a minimum at about 500°C and increased sharply to a maximum at 800°C. In this system, an Fe-15% Cr-30% Co alloy showed a maximum strain gauge factor of 7.3, and an electrical resistivity of 0.78 μ Ømega m at room temperature and its temperature coefficient of 100×10-5/°C. The thermo-electromotive force relative to copper was -1.2 μ V/°C for this alloy.


(Received 1977/04/30)

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