Atom Probe Tomography investigations on grain boundary segregation in polycrystalline Ti(C, N) and Zr(C, N) CVD coatings. (15th March 2019)

• Record Type: Journal Article
• Authors: El Azhari, Idriss; Barrirero, Jenifer; García, José; Soldera, Flavio; Llanes, Luis; Mücklich, Frank
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 335
• Page End: 340
• Publication Date: 2019-03-15
• Subjects: CVD polycrystalline coatings -- Atom Probe Tomography -- Grain boundary segregation -- Chlorine -- Cobalt; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.041
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Atom Probe Tomography (APT) was used to obtain a direct evidence of chlor segregation and cobalt diffusion at the grain boundaries (GBs) of polycrystalline coatings deposited by moderate temperature chemical vapor deposition (MT-CVD) on a WC-Co cemented carbide substrate. Reasons behind segregations are discussed, and its effects are correlated to the micromechanical properties of Ti(C, N) and Zr(C, N). It is concluded that chlorine segregation is a relevant factor for explaining the low cohesive strength at the GBs of Ti(C, N) leading to intergranular failure during micro-compression testing, while its absence in Zr(C, N) along with Co diffusion contribute to grain boundary strengthening. Graphical abstract: Unlabelled Image