Developing a high-strength Al–11Si alloy with improved ductility by combining ECAP and cryorolling

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

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Author(s)

  • Dan Song
  • Guowei Wang
  • Zhikai Zhou
  • Edwin Eyram Klu
  • Bo Gao
  • Aibin Ma
  • Yuna Wu
  • Jiapeng Sun
  • Jinghua Jiang

Detail(s)

Original languageEnglish
Article number138880
Journal / PublicationMaterials Science & Engineering A
Volume773
Online published1 Jan 2020
Publication statusPublished - 31 Jan 2020
Externally publishedYes

Abstract

In this study, a high-strength Al–11Si alloy with an improved ductility was developed via a two-step processing route - equal-channel angular pressing (ECAP) and post-cryorolling. Specifically, the cast alloy was ECAP processed at 623 K for 16 passes, followed by multi-pass cryorolling with 50% thickness reduction. Herein, its mechanical properties was evaluated, and the underlying mechanisms for the improvement of both strength and ductility was investigated. Through systematic comparisons with other samples, including the cast, the cast-rolled, the ECAP-processed and the ECAP-annealed samples, we found the respective origin for the high strength and the improved ductility in the processed alloy. On the one hand, the high strength resulted from both grain boundary strengthening and dislocation strengthening caused by the thermo-mechanical processing. On the other hand, the improved ductility was primarily dictated by the uniform distribution of the very fine Si particles due to the attendant fragmentation of the Si phase during ECAP process. In addition, the results showed that the superior combination of strength and ductility could not be achieved by either processing step alone. This two-step processing route is also promising to benefit other Al–Si alloys for structural applications by optimizing their mechanical properties. © 2020 Elsevier B.V. All rights reserved.

Research Area(s)

  • Al alloy, Equal-channel angular pressing, Materials processing, Strength and ductility

Citation Format(s)

Developing a high-strength Al–11Si alloy with improved ductility by combining ECAP and cryorolling. / Song, Dan; Wang, Guowei; Zhou, Zhikai et al.
In: Materials Science & Engineering A, Vol. 773, 138880, 31.01.2020.

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