Electrodeposition of Dispersion-Hardened Nickel-Al[sub 2]O[sub 3] Alloys

Abstract

Nickel-A1208 alloys were electrodeposited from a Watt's-type nickel-elec- trolyte, which contained the second phase particles suspended in the solution. The effects of particle concentration, particle size, and plating conditions on microstructure and physical properties of the deposits were studied. Using submicroscopic A120~ particles, the room temperature yield strength increased from 8 kg/mm ~ for pure nickel to 35 kg/mm 2 for alloys containing 3.5-6.0 v/o (volume per cent) A1203. It is believed that this increase was due to dis- persion strengthening effects similar to those observed in sintered or in- ternally oxidized metal-metal oxide systems.