[Age-hardening of minor amounts of iron added Au-10% Pt alloy (Part II) (author's transl)].

The aging process has been studied by 0.09, 0.28 and 0.48 wt% iron added gold-10 wt% platinum alloys. The results obtained are as follows: (1) From the isochronal and isothermal aging, the electrical resistances decreased in proportion to increasing of iron. These decreases are occured to be ordered of iron and platinum. (2) The electrical resistances in the isochronal aging curves are minimized at limited temperature of 600 degrees approximately 680 degrees C, and the growth of nodules would be saturated at this temperature. (3) The apparent activation energies of aging process of Au-Pt-Fe alloys (0.09, 0.28 and 0.48 wt% Fe) were in the range of about 37 approximately 44 Kcal/mole. (4) In the results of the images atructure of nodules was lamella of fcc FePt3 phase and Au-Pt solid solution phase.