Similar and dissimilar welds of ultrafine grained aluminium obtained by friction stir welding

Marta Orłowska , Tomasz Brynk , Andreas Hütter , Jacek Goliński , Norbert Enzinger , Lech Olejnik , Małgorzata Lewandowska

Abstract

Samples from commercially pure aluminium were subjected to various number of passes of Incremental Equal Channel Angular Pressing (I-ECAP) and subsequently welded using Friction Stir Welding (FSW). Similar and dissimilar welds were obtained and investigated in terms of their microstructure and mechanical properties. In the case of similar weld from coarse grained aluminium in the stir zone a decreased average grain size was obtained, which resulted in enhanced microhardness. In the case of samples after I-ECAP, the ultrafine grained regime has not been preserved, which caused a drop in microhardness in the stir zone. Nevertheless, obtained results were still higher than those for coarse grained sample. In all welds the average grain size of 2.1–3.7 μm was obtained. No correlation between the microstructure of base material and stir zone has been found. Tensile tests revealed, that the localization of deformation was obtained in each weld in the area of the biggest average grain size. For dissimilar welds from deformed and undeformed samples a gradient change in microstructure and microhardness was obtained on the cross-section of the welds.
Author Marta Orłowska (FMSE / DMD)
Marta Orłowska,,
- Division of Materials Design
, Tomasz Brynk (FMSE / DMD)
Tomasz Brynk,,
- Division of Materials Design
, Andreas Hütter
Andreas Hütter,,
-
, Jacek Goliński (FPE / IoMP)
Jacek Goliński,,
- The Institute of Manufacturing Processes
, Norbert Enzinger
Norbert Enzinger,,
-
, Lech Olejnik (FPE / IoMP)
Lech Olejnik,,
- The Institute of Manufacturing Processes
, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
Journal seriesMaterials Science and Engineering A-Structural Materials Properties Microstructure And Processing, [Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing], ISSN 0921-5093, e-ISSN 1873-4936
Issue year2020
Vol777
Pages1-15
Publication size in sheets6953.8
Keywords in EnglishAluminium; Severe plastic deformation; Friction stir welding; Microstructure; Mechanical properties
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 2500 General Materials Science; 3104 Condensed Matter Physics
DOIDOI:10.1016/j.msea.2020.139076
URL https://graz.pure.elsevier.com/en/publications/similar-and-dissimilar-welds-of-ultrafine-grained-aluminium-obtai
Languageen angielski
File
2020 MSEA Orłowska(1).pdf 6.03 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 23-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.943; WoS Impact Factor: 2018 = 4.081 (2) - 2018=4.014 (5)
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