Creep behaviour and microstructural evolution of AlxCrMnFeCoNi high-entropy alloys. Issue 10 (3rd July 2019)

• Record Type: Journal Article
• Authors: Cao, C. M.; Xu, J.; Tong, W.; Hao, Y. X.; Gu, P.; Peng, L. M.
• Is Part Of: Materials science and technology. Volume 35:Issue 10(2019)
• Page Start: 1283
• Page End: 1290
• Publication Date: 2019-07-03
• Subjects: High-entropy alloy -- Creep behaviour -- microstructure -- precipitation -- activation energy; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2019.1619306
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: The creep deformation behaviour of thermo-mechanically treated Al x CrMnFeCoNi high-entropy alloys was investigated in the high-temperature range of 600–700°C. Compared with the Al-free CrMnFeCoNi alloy, the Al x CrMnFeCoNi alloys showed higher creep resistance under the same creep conditions due to strengthening contribution from elemental Al. The Al0.4 CrMnFeCoNi alloy exhibited a stress-dependent transition from the low-stress region to high-stress region. The Al0.6 CrMnFeCoNi alloy showed decreased creep resistance compared to the Al0.4 CrMnFeCoNi alloy, which was ascribed to the higher activation volume and stacking-fault energy in the former alloy. Specifically, the intragranular formation of Cr-rich σ precipitation was widely found in the matrix grain among testing conditions, indicating a striking atomic diffusion process due to the limited entropic stabilisation in Al-containing CrMnFeCoNi alloys.