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Microstructure and mechanical performance of new Al0.5CrFe1.5MnNi0.5 high-entropy alloys improved by plasma nitriding

✍ Scribed by Wei-Yeh Tang; Ming-Hao Chuang; Hsuan-You Chen; Jien-Wei Yeh

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
794 KB
Volume
204
Category
Article
ISSN
0257-8972

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✦ Synopsis

Effects of plasma nitriding at 525 Β°C on microstructure and mechanical performance of a brand-new Al 0.5 CrFe 1.5 MnNi 0.5 high-entropy alloy (HEA) were investigated. This alloy exhibits a large age hardening effect at temperatures from 600 to 800 Β°C and can be well-nitrided in the as-cast condition or the homogenized and furnace-cooled state. The nitrided layer has a thickness around 75 ΞΌm and a peak hardness level of Hv 1250 near the surface. The nitrided Al 0.5 CrFe 1.5 MnNi 0.5 alloys exhibit superior adhesive wear resistance to conventional nitrided steels by 25-54 times due to their much thicker highly-hardened layer and higher peak hardness than that of conventional steels.

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## Abstract Effects of Co content on microstructures and hot hardness of a new high‐entropy alloy system, AlCo~__x__~CrFeMo~0.5~Ni (__x__ = 0.5 to 2.0) were investigated. As cobalt content increases, the microstructure changes from dendrite to polygrain type and the constituent phases change from B