Processing, Superplastic Properties and Friction Stir Welding of Fine-Grained AZ31, AZ91, AE42 and QE22 Magnesium Alloys

Talant Ryspaev; M. Janecek; Robert Kral; Volker Wesling; Lothar Wagner

doi:10.4028/www.scientific.net/MSF.838-839.220

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HomeMaterials Science ForumMaterials Science Forum Vols. 838-839Processing, Superplastic Properties and Friction...

Processing, Superplastic Properties and Friction Stir Welding of Fine-Grained AZ31, AZ91, AE42 and QE22 Magnesium Alloys

Abstract:

The grain refinement after thermo-mechanical treatment (TMT) was investigated in AZ91, AE42, und QE22 magnesium alloys. The optimal over-aging temperature was determined to be 300 °C in the case of AZ91 and AE42 alloys and 350 °C for QE22 alloy. After optimized TMT, the average grain sizes were 13.5 µm (AE42), 11.1 µm (AZ91) and 1.9 µm (QE22). The QE22 alloy exhibited the superior superplastic properties, with maximum elongation to failure 750 % and strain rate sensitivity parameter m=0.73. The Friction Stir Welding showed that the original base material grain structure of the alloys AZ31 and AZ91 replaced by ultrafine grains in the stir zone. The purpose of the present paper is to present the results of the grain refinement in magnesium alloys by thermo mechanical treatment and stir welding.

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Materials Science Forum (Volumes 838-839)

Pages:

220-224

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.838-839.220

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Online since:

January 2016

Authors:

Talant Ryspaev*, M. Janecek, Robert Kral, Volker Wesling, Lothar Wagner

Keywords:

Magnesium Alloys, Nanostructure, Stir Welding, Superplasticity, Ultrafein Grained

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