Measuring the brittle-to-ductile transition temperature of tungsten–tantalum alloy using chevron-notched micro-cantilevers. (15th April 2020)

• Record Type: Journal Article
• Authors: Li, B.-S.; Marrow, T.J.; Armstrong, D.E.J.
• Is Part Of: Scripta materialia. Number 180(2020)
• Page Start: 77
• Page End: 82
• Publication Date: 2020-04-15
• Subjects: Micro-fracture tests -- High-temperature micromechanics -- BDTT -- Crack tip plasticity -- Tungsten alloy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.01.030
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: High-temperature micro-fracture tests of a industrial grade W–1%Ta alloy were performed from room temperature up to 700 °C, using chevron-notched micro-cantilevers. A gradual increase of conditional fracture toughness (KQc ) was measured with increasing temperature, and a microscale brittle-to-ductile transition temperature (BDTT) was found at ~600 °C. This is slightly higher than macroscopic three-point bending tests from the same material (~400 °C), and contradicts most literatures for pure tungsten that shows a significant lower micro-BDTT. The results suggested that the BDTT is independent of the specimen size, and the higher micro-BDTT is due to the tantalum in this alloy. Graphical abstract: Image, graphical abstract