Anomalous microstructure and excellent mechanical behaviors of (CoCrFeNi)6-x-yCrxAly high-entropy alloy induced by Cr and Al addition
作者： Mengdi Zhang , Lijun Zhang , Jiantao Fan , Pengfei Yu , Gong Li
DOI: 10.1016/J.MSEA.2019.02.071
关键词:
摘要: Abstract The (CoCrFeNi)6-x-yCrxAly (x = 0.5, y = 0; x = 1, and y = 1) high-entropy alloys were prepared, the microstructure mechanical behaviors investigated. crystal structure changed from a sole face-centered-cubic (FCC) to dual-phase of FCC plus body-centered-cubic (BCC) with increasing Cr content. By controlling addition Al elements, crystalline BCC structure, which was composed two ordered phase. One is (Al, Ni)-enriched, other (Co, Fe, Cr)-enriched. increment BCC/B2 phase could significantly enhance hardness yield strength slight sacrifice ductility. nanoindentation tests showed that content, nano-hardness increased 4.58 GPa 8.95 GPa, elastic modulus 200.83 GPa 233.76 GPa, respectively. Based on results, H/Er H3/Er2 values calculated, be used estimate wear resistance. Both ratio an increase trend demonstrated anti-wear ability enhanced. compression indicated (CoCrFeNi)4Cr1Al1 alloy excellent comprehensive properties, whose fracture strain 1653 MPa 29.5%, Furthermore, strengthening mechanism has been discussed. In comparison solid solution strengthening, second dominant.
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