The Portevin-Le Châtelier effect of gradient nanostructured 5182 aluminum alloy by surface mechanical attrition treatment

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

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Author(s)

  • Xiangchen Meng
  • Bei Liu
  • Lan Luo
  • Yan Ding
  • Xi-Xin Rao
  • Bin Hu
  • Yong Liu

Detail(s)

Original languageEnglish
Pages (from-to)2307-2315
Journal / PublicationJournal of Materials Science and Technology
Volume34
Issue number12
Online published6 Jun 2018
Publication statusPublished - Dec 2018

Abstract

Nanocrystalline surface layers and gradient nanostructure in 5182 aluminum alloy have been produced through surface mechanical attrition treatment (SMAT). The results indicate that the gradient nanostructure can not only improve the mechanical properties of 5182 Al alloy, but also has a certain effect on the Portevin-Le Châtelier (PLC) effect. The yield and ultimate tensile strength of 5182 Al alloy with SMAT are significantly improved combining with the decrease of fracture elongation compared with the as-received one. The PLC effect of 5182 Al alloy could be effectively postponed by the formation of gradient nanostructure after SMAT. It leads to the increase of critical strain of the PLC effect, more concentrated distribution of serrated strain, and increase of average stress amplitude in special strain range. The influence of grain size and gradient nanostructure on the PLC effect of 5182 Al alloy was also discussed in detail. Grain refinement could sharply increase the density of dislocations and hinder the movement of dislocations, which results in the decrease of moving speed of dislocations and the more concentrated distribution of solute atoms. The solute atoms would aggregate to form nano precipitates and further impede movement of dislocation. The stronger interaction between the dislocations and the nano precipitates is the main mechanism of postponed PLC effect.

Research Area(s)

  • Aluminum alloy, Gradient nanostructure, Portevin-Le Châtelier effect, Serrated yielding, Surface mechanical attrition treatment

Citation Format(s)

The Portevin-Le Châtelier effect of gradient nanostructured 5182 aluminum alloy by surface mechanical attrition treatment. / Meng, Xiangchen; Liu, Bei; Luo, Lan; Ding, Yan; Rao, Xi-Xin; Hu, Bin; Liu, Yong; Lu, Jian.

In: Journal of Materials Science and Technology, Vol. 34, No. 12, 12.2018, p. 2307-2315.

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