Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636481 | Transactions of Nonferrous Metals Society of China | 2015 | 8 Pages |
Abstract
Nanocrystalline nickel coating was prepared by flexible friction assisted electrodeposition technology in an additive-free Watts bath. The coating consists of massive equiaxial crystals with an average grain size of about 24 nm and exhibits a (111) preferred orientation. The differential scanning calorimetry (DSC) analysis of nanocrystalline nickel demonstrates that the peak temperature of rapid grain growth is about 285.4 °C, and the peak temperature of grain growth towards equilibrium is around 431.5 °C. The isochronous annealing results reveal that abnormal grain growth behavior is not observed in nanocrystalline nickel without sulfur-containing. The thermal stability of the deposition was improved due to its initial microstructure of the as-deposited nickel and a certain amount of annealing nano-twins with low-energy, which reduces the driving force for grain growth. Consequently, the coating shows a low residual tensile stress of about 50 MPa and a high microhardness of HV 400 at the annealing temperature of 450 °C.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Biao LÃ, Zhen-feng HU, Xiao-he WANG, Bin-shi XU,