Nanoporosity improves the damage tolerance of nanostructured tantalum nitride coatings. (May 2017)

• Record Type: Journal Article
• Authors: Xu, Song; Xu, Jiang; Munroe, Paul; Xie, Zong-Han
• Is Part Of: Scripta materialia. Number 133(2017)
• Page Start: 86
• Page End: 91
• Publication Date: 2017-05
• Subjects: Porous material -- Damage-tolerant -- Nanocrystalline material -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.02.008
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Conventionally, nanostructured ceramics are susceptible to brittle fracture due to processing-induced flaws such as porosity. In this study, the microstructure and deformation behavior of two nanostructured Ta2 N coatings, one with a fully-dense structure and the other with a nanoporous structure, both prepared by double cathode glow discharge technique, were investigated. It was found that the elastic modulus of the Ta2 N coatings is more sensitive to the presence of nanoporosity than their hardnesses. Compared with the fully-dense Ta2 N coating, the nanoporous Ta2 N coating exhibits a marked increase in the damage tolerance, as well as a good potential for wear-resistance. Graphical abstract: