Exploring the thermal stability of a bimodal nanoscale multilayered system

SCRIPTA MATERIALIA

卷:166

Article

Riano, J. Sebastian¹  Hodge, Andrea M.^1,2 

[1] Univ Southern Calif, Dept Chem Engn & Mat Sci, 3650 McClintock Ave, Los Angeles, CA 90089 USA

[2] Univ Southern Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

关键词: Bimodal nanometallic multilayers;    Thermal stability;    Interfaces;    Brick-like grains;    Nanomaterials;   

DOI  :  10.1016/j.scriptamat.2019.02.043

来源: Elsevier

【 摘 要 】

The thermal stability of bimodal Ta-Hf nanometallic multilayers, comprised of columnar and brick-like grains, was explored by characterizing films annealed at 550 degrees C and 1000 degrees 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free