日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 6 (1968),
pp. 504-509

On the Mechanism of Precipitation Hardening in Fe-Ni-Cr-Ti Alloy

Zenzo Henmi1, Takeshi Nagai1 and Hiroyasu Hojo1

1Fujitsu Laboratories, Kawasaki

Abstract:

The mechanism of precipitation hardening in Fe-Ni-Cr-Ti alloy was studied by microhardness test, thermal dilatation measurement, X-ray diffraction, optical and transmission electron microscopy. The results show that the mechanism of precipitation hardening in Fe-Ni-Cr-Ti alloy is similar to those in Fe-Ni-Ti alloy. It is an advantageous nature of this alloy that the heat treatment which gives a good constant modulus charactaristic agrees with that which gives excellent mechanical properties. That is, when Fe-Ni-Cr-Ti alloy was aged for 2 hr at 600°C, the η phase precipitates in proper distribution and the alloy is strengthened; after the η phase precipitates, the composition of the γ phase resembles that of Elinvar and the thermoelastic coefficient approaches zero.


(Received 1967/10/30)

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