Microstructure and mechanical properties of friction stir welded and laser welded high entropy alloy CrMnFeCoNi
- Microstructure and mechanical properties of friction stir welded and laser welded high entropy alloy CrMnFeCoNi
- 서진유; 김동익; 김한진; 조민구; 강민정; 파니라지; 박은수; 홍성태; 한흥남
- high entropy alloy; friction stir welding; laser welding, microstructure; mechanical property
- Issue Date
- Metals and Materials International
- VOL 24, NO 1-83
- 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.
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