Thermal stability and deformability of annealed nanotwinned Al/Ti multilayers. (September 2020)

• Record Type: Journal Article
• Authors: Zhang, Y.F.; Su, R.; Niu, T.J.; Richter, N.A.; Xue, S.; Li, Q.; Ding, Jie; Yang, Bo; Wang, H.; Zhang, X.
• Is Part Of: Scripta materialia. Number 186(2020)
• Page Start: 219
• Page End: 224
• Publication Date: 2020-09
• Subjects: Al/Ti multilayers -- Thermal stability -- In situ micropillar compression; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.04.015
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Recent studies showed that nanotwinned Al/Ti multilayers have outstanding mechanical properties at room temperature. However, the thermal stability of these multilayers remains unclear. Here, we show that after annealing at 400 °C, nanotwinned Al/Ti multilayers demonstrate excellent thermal stability and limited intermixing when individual layer thickness exceeds 22 nm. Whereas nanolayers of TiAl formed in the annealed Al/Ti 4.5 nm multilayer. Annealing induced substantial hardening, and the magnitude of hardening is greater at smaller layer thickness. In situ micropillar compression tests show the annealed Al/Ti multilayers have high flow stress (exceeding 3 GPa), work hardening capability, and good deformability. Graphical abstract: Image, graphical abstract