Abstract
Structure and configuration of lattice defects in tungsten-cobalt electrodeposits were examined under transmission electron microscope. The layer as deposited contained numerous stacking faults and twin faults in each grain, giving martensitelike structure.
As the results of electron diffraction analysis, it was found that the crystal structure of the deposits consisted of hexagonal α-Co solid solution oversaturated with tungsten and that after heating at 600°C for 2hr., precipitation of Co3W appeared in α-Co phase. However, the appearance of Co3W phase was not evidently detected under electron microscope, even though it was determined by electron diffraction.
Hardening of the deposits after heating seemed to be attributed to the precipitation of Co3W.
