CoCrFeMnNi high-entropy alloys reinforced with Laves phase by adding Nb and Ti elements. Issue 6 (18th January 2019)

• Record Type: Journal Article
• Authors: Qin, Gang; Li, Zibo; Chen, Ruirun; Zheng, Huiting; Fan, Chenlei; Wang, Liang; Su, Yanqing; Ding, Hongsheng; Guo, Jingjie; Fu, Hengzhi
• Is Part Of: Journal of materials research. Volume 34:Issue 6(2019)
• Page Start: 1011
• Page End: 1020
• Publication Date: 2019-01-18
• Subjects: high-entropy alloys, -- laves phase, -- phase selection, -- mechanical properties; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2018.468
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : Laves phase plays a positive role in improving the strength of high-entropy alloys (HEAs); Nb and Ti elements have potential to promote Laves phase formation in some HEAs. For improving the strength of the face-centered cubic (FCC) CoCrFeMnNi HEA, a series of (CoCrFeMnNi)100− x Nb x (atomic ratio: x = 0, 4, 8, 12, 16) and (CoCrFeMnNi)100− x Ti x (atomic ratio: x = 0, 2, 4, 6, 8, 12) HEAs were prepared by melting. The effects of Nb and Ti on the microstructure evolution and compressive properties of the CoCrFeMnNi HEAs were investigated. For (CoCrFeMnNi)100− x Nb x HEAs, the second-phase (Laves and σ phase) volume fraction increased from 0 to 42%. The yield strength also increased gradually from 202 to 1010 MPa. However, the fracture strain decreased from 60% (no fracture) to 12% with increasing Nb content. For (CoCrFeMnNi)100− x Ti x HEAs, the yield strength increased from 202 to 1322 MPa. The Laves phase volume fraction also increased from 0 to 27%. However, the fracture strain decreased from 60% (no fracture) to 7.5% with increasing Ti content. Addition of Nb and Ti has a good effect on improving the strength of FCC CoCrFeMnNi HEA.