Observation of tension/compression asymmetry in an Nb-Al-V alloy

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

Mechanical tests at room temperature have been performed on a B2 Nb-15Al-20V alloy and transmission electron microscopy (TEM) was used to examine the microstructures. The alloy exhibited a significant difference in deformation behavior between tension and compression. In tension, the alloy was brittle while in compression it exhibited very good ductility. This asymmetry can be explained by examining the dislocation structures after deformation. The Burgers vectors of the dislocations in tension were found to be 1/2(111) slipping on {110}. In compression the slip plane was determined to be {112}. The dislocations in tension exhibited a very low mobility and piled up dislocation arrays were easily seen. In compression, the dislocations showed good mobility and dislocation clusters also triggered the formation of pseudotwins, which is consistent with the mechanical properties. (C) 2004 Elsevier B.V. All rights reserved.

Details

Original languageEnglish
Pages (from-to)476-480
Number of pages5
JournalMaterials Science and Engineering A
Volume387-389
Publication statusPublished - 1 Jan 2004

Keywords

  • dislocation, Nb-Al-V alloy, pseudotwin, asymmetry