The phase composition and workability of electrodeposited Fe-Zn alloy.

Electrodeposited Fe-Zn alloy was studied with respect to the phase composition and workability.(1) The phase composition was investigated in the range of 10-30% Fe. The η phase was a main phase up to 13% Fe and extended further to 20% Fe. The δ1 phase appeared from 10% Fe and became a main phase in the range of 13-20% Fe. The δ1 phase was present up to 28% Fe. The Γ phase appeared from 10% Fe, but remained to a small extent up to 15% Fe. The Γ phase became a main phase in the range over 21% Fe and the sole one observed in the range over 28% Fe.(2) Depending on the bath used, different phase compositions which contain the same Fe in ehe deposit were found.(3) The phase composition determined workability of the deposit, which was evaluated in terms of draw bead test. The η phase exhibited good workability. In contrast, the δ1+Γ phases lowered the workability of the deposit. Since the presence of the η phase improves workability, it is desirable that the deposit contains the η phase to some extent from the viewpoint of workability.