Microstructural response to compression deformation of ultrafine-grained aluminum with various microstructures

Witold Chromiński , Kamil Majchrowicz , Małgorzata Lewandowska

Abstract

Ultrafine-grained aluminum having a variety of microstructural features such as fibrous grain morphology, strong or random texture and a dominance of low- or high-angle grain boundaries was compressed to 4% of true strain. This made it possible to measure yield strength and begin a microstructure evolution to accommodate an external load. The level of deformation was high enough to provide changes in the microstructure, but relatively low in order to make it possible to determine the deformation mode in grain types recognized in the precompressed condition, before they become unrecognizable. As a next step, a detailed EBSD examination of these samples before and after compression was performed to track those changes. These observations revealed that, in the samples with a fibrous microstructure, the role of particular fibers changes when the grain refinement is more pronounced within them. In the sample with a relatively uniform microstructure and a grain size of below 800 nm, the post-deformation observations indicated there had been significant grain rotations with a blurring of the initial texture. Based on our observations, we can state that the heterogeneity of plastic deformation mechanisms in ultrafine-grained aluminum is dependent on local variations in microstructure – the arrangement of defects and the crystallographic orientation.
Author Witold Chromiński (FMSE / DMD)
Witold Chromiński,,
- Division of Materials Design
, Kamil Majchrowicz (FMSE / DMD)
Kamil Majchrowicz,,
- Division of Materials Design
, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
Journal seriesMaterials Science and Engineering A-Structural Materials Properties Microstructure And Processing, ISSN 0921-5093, (N/A 140 pkt)
Issue year2019
Vol763
Pages1-9
Publication size in sheets0.5
Article number138184
Keywords in EnglishAluminum; Plastic deformation; Ultrafine-grained materials; Electron backscattered diffraction
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 3104 Condensed Matter Physics; 2500 General Materials Science
DOIDOI:10.1016/j.msea.2019.138184
URL https://doi.org/10.1016/j.msea.2019.138184
Languageen angielski
File
2019 MSEA Chromiński_1.pdf 4.81 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 20-12-2019, ArticleFromJournal
Publication indicators WoS Citations = 1; 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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