Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys

Using thermochemical treatments, boronized layers were successfully prepared on Al 0.25 CoCrFeNi high-entropy alloys (HEAs). The thickness of the boronized layers ranged widely from 20 to 50 µm, depending on the heat treatment time. Boronizing remarkably improved the surface hardness from HV 188 to...

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Veröffentlicht in:International journal of minerals, metallurgy and materials metallurgy and materials, 2020-10, Vol.27 (10), p.1363-1370
Hauptverfasser: Hou, Jin-xiong, Fan, Jing, Yang, Hui-jun, Wang, Zhong, Qiao, Jun-wei
Format: Artikel
Sprache:eng
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Zusammenfassung:Using thermochemical treatments, boronized layers were successfully prepared on Al 0.25 CoCrFeNi high-entropy alloys (HEAs). The thickness of the boronized layers ranged widely from 20 to 50 µm, depending on the heat treatment time. Boronizing remarkably improved the surface hardness from HV 188 to HV 1265 after treating at 900°C for 9 h. Moreover, boronizing enhanced the yield strength of HEAs from 195 to 265 MPa but deteriorated the tensile ductility. Multiple crackings in the boride layers significantly decreased the plasticity. The insufficient work-hardening capacity essentially facilitated the plastic instability of the boronized HEAs. With decreasing substrate thickness, the fracture modes gradually transformed from dimples to quasi-cleavage and eventually to cleavage.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-020-1967-6