MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 卷:770 |
Microstructure evolution and strengthening mechanisms in friction-stir welded Al-Mg-Sc alloy | |
Article | |
Vysotskiy, I.1  Zhemchuzhnikova, D.1  Malopheyev, S.1  Mironov, S.1  Kaibyshev, R.1  | |
[1] Belgorod Natl Res Univ, Lab Mech Properties Nanoscale Mat & Superalloys, Pobeda 85, Belgorod 308015, Russia | |
关键词: Aluminium alloys; Second-phase particles; Friction-stir welding; Electron backscatter diffraction; Microstructure; Microstructure-strength relationship; | |
DOI : 10.1016/j.msea.2019.138540 | |
来源: Elsevier | |
【 摘 要 】
The present work was undertaken to evaluate the effect of second-phase particles on microstructure evolution during friction-stir welding (FSW). To this end, Al-6.0Mg-0.35Mn-0.2Sc-0.1Zr alloy containing insoluble nanoscale Al-3(Sc,Zr) dispersoids was used as a program material. A particular emphasis was given to an establishment of a microstructure-strength relationship in the welded material. It was found that pinning effect of the Al-3(Sc,Zr) precipitates efficiently suppressed grain-boundary migration and promoted a concentration of slip activity in heavily-stressed near-grain-boundary regions. This gave rise to a preferential development of deformation-induced boundaries in the latter areas. Due to a complex character of slip at the grain boundaries, the newly evolved grains had nearly random crystallographic orientations. As a result, the final microstructure evolved in stir zone was characterized by relatively-fine grain size, poorly-developed texture and large fraction of high-angle boundaries. The retention of the coherent dispersoids as well as considerable grain refinement occurring during FSW resulted in substantial material hardening in the stir zone.
【 授权许可】
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