Negative Strain‐rate Sensitivity in a Nanostructured Aluminum Alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)945-947
Journal / PublicationAdvanced Engineering Materials
Volume8
Issue number10
Online published24 Oct 2006
Publication statusPublished - Oct 2006
Externally publishedYes

Abstract

The strain rate sensitivity of several nanometer and ultrafine-grain (UFG) materials had been studied at room temperature to understand the deformation mechanisms. The purpose of the study was to investigate the influence of strain rate on the deformation behavior of a nanostructured 5083 Al alloy processed by cryomilling and hot extrusion and to provide insight into the underlying deformation mechanisms of UFG Al alloys. A positive strain rate sensitivity of flow stress at room temperature was observed in the compression deformation of nanocomposite Al-Ti-Cu alloy, and a small negative strain rate sensitivity was noticed in the tensile deformation of UFG Al-Mg alloy. The negative strain rate sensitivity is attributed to the effect of dynamic strain aging which is caused by the interactions of dislocations with solute atoms. The near-perfect plastic flow was caused by dynamic recovery and dislocation emission and annihilation at grain boundaries.

Citation Format(s)

Negative Strain‐rate Sensitivity in a Nanostructured Aluminum Alloy. / Han, Bing Q.; Huang, Jianyu; Zhu, Yuntian T.; Lavernia, Enrique J.

In: Advanced Engineering Materials, Vol. 8, No. 10, 10.2006, p. 945-947.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review