Age-hardening in a two component immiscible nanolaminate metal system. (15th July 2017)

• Record Type: Journal Article
• Authors: Kim, Chang-Eun; Rahimi, Raheleh M.; Maxwell, Tyler L.; Balk, T. John; Bahr, David F.
• Is Part Of: Scripta materialia. Number 136(2017)
• Page Start: 33
• Page End: 36
• Publication Date: 2017-07-15
• Subjects: Sputtering -- Multilayers -- Precipitation -- Density functional theory (DFT) -- Nanoindentation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.03.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Density functional theory was used to predict the diffusion and precipitation of Cr in Cu. The energy barrier of Cr diffusion in Cu is comparable to the self-diffusion of Cr, and higher than the energy barrier of Cu self-diffusion. The simulations support the experimentally measured hardness of 30 nm thick nanolaminate layers of Cr/Cu-3.4%Cr. As-deposited films had a hardness of 6.25 GPa; annealing at 373 K decreased hardness to 5.95 GPa, while annealing at 573 K increased the hardness to 6.6 GPa. Transmission electron microscopy indicates there is significant local strain due to precipitation, in agreement with theoretical predictions. Graphical abstract: