Plastic Deformation in an Amorphous Ni-P Coating

Journal Article · Tue May 01 00:00:00 EDT 2012 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 43(5):1610-1620

DOI:https://doi.org/10.1007/s11661-011-0989-0· OSTI ID:1095460

Shen, Yongfeng; Liu, Wenning; Sun, Xin; Xue, W. Y.; Wang, Y. D.; Zuo, Liang; Liaw, Peter K.

An experimental and numerical investigation of the hardness and associated plastic deformation in as-deposited and as-annealed nickel-phosphorus (Ni-P) coatings was conducted. In addition to the indentation-deformation behavior, the deformation morphology underneath the indenter was examined. The yield strength extracted from the indentation data is as high as 5.6 GPa, indicating pressure-sensitive plasticity. Results show that the as-deposited Ni-P coating was deformed appreciably through the shear-band mechanism with semi-circular and radial shear-band morphologies. From the incremental loading-unloading cyclic experiments, the phenomena on hardening and recovery, which have scarcely been recognized in amorphous materials at room temperature, were observed in the amorphous coating using instrumented nanoindentation. A numerical simulation of the interfacial indentation test between the Ni-P coating and the substrate reveals the pile-up and shear bands of the Ni-P coating that were observed during the indentation tests.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1095460
• Report Number(s): PNNL-SA-81485; VT0505000
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 43(5):1610-1620, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 43(5):1610-1620
• Country of Publication: United States
• Language: English