Experimental study demonstrates enhanced strength-ductility synergy in laser-clad FeMnCoCr alloys via TiN-mediated nanoprecipitates, highlighting a route to bypass traditional trade-offs.
Heterostructured materials provide an effective pathway for overcoming the conventional strength-ductility trade-off. This work introduces TiN-mediated heterostructured nanoprecipitates into laser-clad Fe50Mn30Co10Cr10 metastable high-entropy alloy coatings to couple grain refinement, FCC stabilization, and staged TRIP/TWIP-assisted deformation. The TiN addition promotes the in-situ formation of TiN-mediated core–shell nanoprecipitates containing TiN-rich shells, 9R-like domains, and MnTi2O4-rich regions. These nanoprecipitates refine the solidification microstructure, stabilize the metastable FCC matrix, and provide effective barriers to dislocation motion. Among the freestanding coating specimens, the 2TiN condition exhibits the best strength-ductility synergy, achieving a UTS of ∼1062 MPa and a total elongation of ∼22.8%.
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Jie et al. (2026) studied this question.
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