Study of microstructure evolution and strengthening mechanisms in Mox(Nb3TaTi3Zr)100−x high-entropy alloys

• Published in: AIP advances 2024-03, Vol.14 (3), p.035244-035244-7
• Main Authors: Chen, Sishuo, Bao, Li, Yang, Hongtao, Si, Xudong
• Format: Article
• Language: English
• Subjects: Body centered cubic lattice; Crystal structure; Evolution; Face centered cubic lattice; Heat treating; High entropy alloys; Microhardness; Microstructure; Molybdenum; Precipitates; Room temperature; Solid solutions; Solution strengthening; Yield strength; Yield stress
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/5.0199580

A new series of high-entropy alloys denoted as Mox(Nb3TaTi3Zr)100−x, has been designed for aero-engine applications. The study focused on investigating the microstructural evolution and strengthening mechanisms of the alloys in response to varying Mo content. Results indicate that the alloys primarily display a BCC crystal structure. Notably, an FCC phase precipitates in the alloy when the Mo content reaches 30%. Furthermore, as the Mo content increases, the strength of the alloys significantly increases while their plasticity diminishes. The room-temperature yield strength of the alloys shows a substantial increase from 729 MPa (x = 0) to 1202 MPa (x = 25), while the yield strength at 1200 °C rises from 62 MPa (x = 0) to 498 MPa (x = 30). Concurrently, the microhardness of the alloys also increases from 247 HV (x = 0) to 471 HV (x = 30). The observed strengthening mechanisms include solid solution strengthening, fine grain strengthening, and precipitated phase strengthening.