日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 6 (1968),
pp. 498-503

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

Zenzo Henmi1, Takeshi Nagai1 and Hiroyasu Hojo1

1Fujitsu Laboratories, Kawasaki

Abstract:

The mechanism of precipitation hardening in Fe-50%Ni-3%Ti constant modulus type alloy was studied by microhardness test, thermal dilatation measurement, X-ray diffraction, optical and transmission electron microscopy. When η phase less than 0.1 μ in thickness precipitates at grainboundaries, the alloy achieves a maximum hardness. When this alloy was aged for 2 hr at 800°C, the deformation structure was annealed out and the mean spacing between recrystallized γ phase and coarsened η phase increased and the alloy softened.


(Received 1967/10/30)

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