Improved yielding strength and fatigue-crack-growth resistance of non-equiatomic FeNiCoCr high-entropy alloy produced by laser powder-bed fusion
Source abstract
Abstract
This study compares the tensile properties and fatigue-crack-growth (FCG) behavior of a non-equiatomic Fe-20Ni-20Co-20Cr (at. %) high-entropy alloy (HEA) fabricated by laser powder-bed fusion (LPBF) and conventional casting-and-thermomechanical routine. Tests were conducted on dog-bone-shaped single-edge-notched tensile (SENT) samples in accordance with ASTM E647 at frequencies of 1 Hz and 10 Hz. The LPBF samples exhibited approximately 20% higher ΔK th value and a 30∼40% reduction in da/dN compared to their wrought counterparts. Specifically, the microstructure in the LPBF sample consists of hierarchical cellular and columnar grains with dense dislocation-cell networks concentrated along low-angle cell walls. This multi-scale architecture promotes repeated crack deflection, microbranching, and enhanced plastic energy dissipation, thereby prolonging the effective crack path and decelerating crack growth. The findings demonstrate that intentionally engineered dislocation-cell networks via LPBF provide a viable microstructural design strategy for significantly enhancing fatigue resistance in multi-component Fe-based alloys.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: High Entropy Alloys Studies · Additive Manufacturing Materials and Processes · High-Temperature Coating Behaviors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (39)
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