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000644960 245__ $$aCo-free Al$_{0.5}$CrNi$_{1.5}$Fe$_2$ multi-principal element alloy with heterogeneous structure and excellent strength-ductility combination 
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000644960 520__ $$aThis study investigates a cost-effective, cobalt-free Al$_{0.5}$CrNi$_{1.5}$Fe$_2$ multi-principal element alloy, based on the most studied AlCoCrFeNi alloy system. The alloy underwent thermal mechanical treatment to induce partial recrystallization, resulting in a multi-phase, multi-scale heterogeneous microstructure. After cold rolling the Al$_{0.5}$CrNi$_{1.5}$Fe$_2$ alloy to 80 % reduction and annealing at 800°C for 1 hour, a heterogeneous structure predominantly consisting of “fine-grained recrystallized regions and nano-grained un-recrystallized regions” was formed. The phase compositions of both regions included a disordered FCC matrix and dispersed ordered BCC (B2) precipitates enriched in Al and Ni, as well as disordered BCC precipitates enriched in Fe and Cr. The alloy exhibited a yield strength of 1035 MPa and an elongation of 20.8 %. Compared to its as-cast counterpart, the elongation decreased slightly, while the yield strength increased by 238 %, achieving an excellent combination of high strength, high ductility, and low cost. Cyclic tensile testing revealed that the heterogeneous deformation-induced stress, driven by the heterogeneous microstructure, accounted for over 49 % of the flow stress. This stress, representing the dominant strengthening mechanism, plays a crucial role in maintaining both high strength and ductility in this Co-free alloy.
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000644960 7001_ $$0P:(DE-HGF)0$$aJiang, Zhenfei$$b1$$eCorresponding author
000644960 7001_ $$aWang, Zhong$$b2
000644960 7001_ $$aLiu, Junchen$$b3
000644960 7001_ $$0P:(DE-H253)PIP1084066$$aZhu, Gaoming$$b4$$eCorresponding author
000644960 7001_ $$aLiu, Yinghang$$b5
000644960 7001_ $$aSong, Zhe$$b6
000644960 7001_ $$0P:(DE-HGF)0$$aZhu, Dezhi$$b7$$eCorresponding author
000644960 773__ $$0PERI:(DE-600)2012675-X$$a10.1016/j.jallcom.2025.179563$$gVol. 1021, p. 179563 -$$p179563 $$tJournal of alloys and compounds$$v1021$$x0925-8388$$y2025
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