Microstructure and mechanical properties of friction stir welded and laser welded high entropy alloy CrMnFeCoNi

Title
Microstructure and mechanical properties of friction stir welded and laser welded high entropy alloy CrMnFeCoNi
Authors
서진유김동익김한진조민구강민정파니라지박은수홍성태한흥남
Keywords
high entropy alloy; friction stir welding; laser welding, microstructure; mechanical property
Issue Date
2018-01
Publisher
Metals and Materials International
Citation
VOL 24, NO 1-83
Abstract
The high entropy alloy CrMnFeCoNi has been shown to have promising structural properties. For a new alloy to be used in a structural application it should be weldable. In the present study, friction stir welding (FSW) and laser welding (LW) techniques were used to butt weld thin plates of CrMnFeCoNi. The microstructure, chemical homogeneity and mechanical behavior of the welds were characterized and compared with the base metal. The tensile stress-strain behavior of the welded specimens were reasonable when compared with that of the base metal. FSW refined the grain size in the weld region by a factor of similar to 14 when compared with the base metal. High-angle annular dark field transmission electron microscopy in combination with energy dispersive X-ray spectroscopy showed chemical inhomogeneity between dendritic and interdendritic regions in the fusion zone of LW. Large fluctuations in composition (up to 15 at%) did not change the crystal structure in the fusion zone. Hardness measurements were carried out in the weld cross section and discussed in view of the grain size, low angle grain boundaries and twin boundaries in FSW specimens and the dendritic microstructure in LW specimens.
URI
http://pubs.kist.re.kr/handle/201004/67210
ISSN
1598-9623
Appears in Collections:
KIST Publication > Article
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