Heat-Induced Structural Changes in Electrodeposited Ni-P Alloys

Changesin Electrodeposited Ni-P Alloys． The thermal behavior of electrodeposited Ni-P al／oys corltaining 3．2 to 15．8wt％P(5．9-26．2at％P)and the structural transformation or crystalline products associated with the exotherms were investigated by differential scanning carolimetry(DSC)，X-ray diffraction and transエnission electron Inicroscopy． Moreover， in order to reveal the chemical bonding of phosphorus in the alloys，the P_輪soft X-ray emlssion spectra fro皿the alloys，貸ickel phosphides(Ni3P and Ni2P)and pure red phosphorus were measured by an electron probe microanalyzer． In the alloys with 3．2≦二P≦二11・2wt％・ the supers我turated solid solutioll of P ill the∫06 Ni structure is transformed into a structure consisting of an aggregate mixture of Ni and M3P at 340-430。C． In the alloys with 12。7≦二 P：く15．8wt％， the amorphous solid converts into the metastable single phase at 280-360。C，