Phase Transition Mechanism and Mechanical Properties of AlCrFe2Ni2 High‐Entropy Alloys with Changes in the Applied Carbon Content. Issue 3 (12th February 2020)

• Record Type: Journal Article
• Authors: Li, Zhe; You, Junhua; Guo, Yaozu; Li, Chengze; Zhang, Yufeng; Liu, Ziyu
• Is Part Of: Advanced engineering materials. Volume 22:Issue 3(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-02-12
• Subjects: carbon -- high-entropy alloys -- mechanical properties -- phase transition -- spinodal decomposition; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201901363
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : To understand the effect of carbon addition on dual‐phase high‐entropy alloys (HEAs), the mechanism of phase transition and mechanical properties of AlCrFe2 Ni2 C x ( x = 0, 0.06, 0.12, 0.18, 0.24) are investigated systematically. The results show that carbon addition induced the growth and aggregate of disordered noodle‐like face‐centered cubic (FCC) phases. The volume fraction of the FCC phase increases from 33.2% to 51.2% as the C content increases. The Al and Ni in the alloys are segregated at the phase boundaries. Disappearance of the spinodal decomposition structure compose of a disordered body‐centered cubic (BCC) structure and an ordered BCC structure (B2). The BCC phase transform into a spherical B2 phase with increasing C content. The experimental mechanical properties show that the yield strength of the HEAs is closely related to the volume fraction of BCC phase as the C content increases. The ε phase (Cr, C carbonization) precipitate in an FCC phase when the C content is above 2.0 at%. The hardness of the HEAs increases from 310 to 357 HV as the C content increases. The compressive strength and the fracture strain of the alloy decreases as the C content increases. Abstract : To understand the effect of carbon addition on dual‐phase high‐entropy alloys (HEAs), the mechanism for the effect of carbon on the microstructure of dual‐phase HEAs with both face‐centered cubic (FCC) and body‐centered cubic (BCC) phases is revealed. At the same time, the mechanical properties of AlCrFe2 Ni2 C x ( x = 0, 0.06, 0.12, 0.18, 0.24) are investigated systematically.