The 〓E-Effect and Young's Modulus in Nickel-Cobalt Alloys
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概要
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Young's modulus and its change by magnetization (the 〓E-effect) in annealed nickel-cobalt alloys covering the whole composition range have been measured at ordinary temperatures with the method of magnetostrictive vibration. Young's moduli of γ-phase (face-centered cubic) alloys containing less than 20% Co and of two-phase and ε-phase (close-packed hexagonal) alloys containing 69 to 85% Co increase with magnetization throughout (the 〓E-effect of the first kind), while those of γ-phase alloys containing more than 21% Co decrease first at low magnetizations and then increase (the 〓E-effect of the third kind). This negative 〓E-effect at low magnetizations amounts to -5% at 50% Co, being far more conspicuous than those hitherto known. Young's moduli of ε-phase alloys containing more than 85% Co increase at first, but soon decrease, and finally increase again (the 〓E-effect of the second kind). The saturation value of the 〓E-effect, (〓E/E_0)_s, shows two conspicuous maxima of 28.0 and 23.7% at 3 and 18% Co, respectively. These values of the 〓E-effect are the highest ones ever found at ordinary temperatures. It is shown that the observed and computed values for (〓E/E_0)_s are in good agreement with each other for γ-phase alloys. Young's modulus at unmagnetized state, E_0, takes a course nearly opposite to that of (〓E/E_0)_s in the γ-phase region, showing two minima at 3 and 18% Co. Young's modulus at magnetically saturated state goes parallel to E_0, taking a complicated course even in the γ solid solution range.
- 東北大学の論文
著者
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Taniguchi Satoshi
The Research Institute For Iron Steel And Other Metals
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Yamamoto Mikio
The Research Institute For Iron Steel And Other Metals
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