A nanoindentation investigation of local strain rate sensitivity in dual-phase Ti alloysReportar como inadecuado




A nanoindentation investigation of local strain rate sensitivity in dual-phase Ti alloys - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Reference: Armstrong, DEJ, Jun, TS and Britton, TB, (2016). A nanoindentation investigation of local strain rate sensitivity in dual-phase Ti alloys. Journal of Alloys and Compounds.Citable link to this page:

 

A nanoindentation investigation of local strain rate sensitivity in dual-phase Ti alloys

Abstract: Using nanoindentation we have investigated the local strain rate sensitivity in dual-phase Ti alloys, Ti-6Al-2Sn-4Zr-xMo (x=2 and 6), as strain rate sensitivity could be a potential factor causing cold dwell fatigue. Electron backscatter diffraction (EBSD) was used to select hard and soft grain orientations within each of the alloys. Nanoindentation based tests using the continuous stiffness measurement (CSM) method were performed with variable strain rates, on the order of 10−1 to 10−3s−1. Local strain rate sensitivity is determined using a power law linking equivalent flow stress and equivalent plastic strain rate. Analysis of residual impressions using both a scanning electron microscope (SEM) and a focused ion beam (FIB) reveals local deformation around the indents and shows that nanoindentation tested structures containing both α and β phases within individual colonies. This indicates that the indentation results are derived from averaged α/β properties. The results show that a trend of local rate sensitivity in Ti6242 and Ti6246 is strikingly different; as similar rate sensitivities are found in Ti6246 regardless of grain orientation, whilst a grain orientation dependence is observed in Ti6242. These findings are important for understanding dwell fatigue deformation modes, and the methodology demonstrated can be used for screening new alloy designs and microstructures.

Peer Review status:Peer reviewedPublication status:PublishedVersion:Publisher's version Funder: Engineering and Physical Sciences Research Council   Notes:© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

Bibliographic Details

Publisher: Elsevier

Publisher Website: http://www.elsevier.com

Journal: Journal of Alloys and Compoundssee more from them

Publication Website: http://www.journals.elsevier.com/journal-of-alloys-and-compounds

Issue Date: 2016-02-19Identifiers

Urn: uuid:7c4cd7f6-206e-41f3-9a3d-e0044f4276d1

Source identifier: 607263

Eissn: 1873-4669

Doi: https://doi.org/10.1016/j.jallcom.2016.02.146

Issn: 0925-8388 Item Description

Type: Journal article;

Version: Publisher's versionKeywords: Titanium alloys strain rate sensitivity nanoindentation electron backscatter diffraction cold dwell fatigue Tiny URL: pubs:607263

Relationships





Autor: Armstrong, DEJ - institutionUniversity of Oxford Oxford, MPLS, Materials grantNumberResearch Fellowship fundingRoyal Academy of E

Fuente: https://ora.ox.ac.uk/objects/uuid:7c4cd7f6-206e-41f3-9a3d-e0044f4276d1



DESCARGAR PDF




Documentos relacionados