Exploring the thermal stability of a bimodal nanoscale multilayered system. (June 2019)

• Record Type: Journal Article
• Authors: Riano, J. Sebastian; Hodge, Andrea M.
• Is Part Of: Scripta materialia. Number 166(2019)
• Page Start: 19
• Page End: 23
• Publication Date: 2019-06
• Subjects: Bimodal nanometallic multilayers -- Thermal stability -- Interfaces -- Brick-like grains -- Nanomaterials; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.02.043
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The thermal stability of bimodal Ta-Hf nanometallic multilayers, comprised of columnar and brick-like grains, was explored by characterizing films annealed at 550 °C and 1000 °C. Although the brick-like grains recrystallized, their grain size remained in the nanoscale. Recrystallization of the columnar grains was hindered by semi-coherent sub-grain boundaries and quadrupole points. Growth of the recrystallized brick-like grains was prevented by Hf precipitates, which activated kinetic and thermodynamic stabilization mechanisms. The present results outline a promising route to improve the stability of nanomaterials by using bimodal nanometallic multilayers with engineered interfaces while expanding the available architectures to synthesize nanocrystalline materials. Graphical abstract: Unlabelled Image