Formation of coherent BCC/B2 microstructure and mechanical properties of Al–Ti–Zr–Nb–Ta–Cr/Mo light-weight refractory high-entropy alloys

The present work investigated the formation of coherent body-centered-cubic (BCC)/B2 microstructure in Al–Ti–Zr–Nb–Ta–Cr/Mo refractory high-entropy alloy system, in which three alloys with the composition of Al 2 Ti 6 Zr 2 Nb 3 Ta 2 (Cr/Mo) 1 were designed. These as-cast alloy ingots were homogenize...

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Bibliographic Details
Published in:Rare metals 2022-08, Vol.41 (8), p.2886-2893
Main Authors: Jin, Dong-Ming, Wang, Zhen-Hua, Li, Jin-Feng, Niu, Ben, Wang, Qing
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Alloy systems
Alloys
Aluminum
Biomaterials
Casting alloys
Chemistry and Materials Science
Chromium
Coherence
Compressive strength
Energy
High entropy alloys
Ingot casting
Intermetallic phases
Materials Engineering
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Molybdenum
Nanoscale Science and Technology
Niobium
Original Article
Physical Chemistry
Tantalum
Titanium
Weight reduction
Zirconium
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Summary:The present work investigated the formation of coherent body-centered-cubic (BCC)/B2 microstructure in Al–Ti–Zr–Nb–Ta–Cr/Mo refractory high-entropy alloy system, in which three alloys with the composition of Al 2 Ti 6 Zr 2 Nb 3 Ta 2 (Cr/Mo) 1 were designed. These as-cast alloy ingots were homogenized at 1573 K for 2 h and then aged at different temperatures for 24 h. It is found that the BCC/B2 coherent microstructure with cuboidal BCC nanoprecipitates into the B2 matrix would be formed in 873 K-aged Al 2 Ti 6 Zr 2 Nb 3 Ta 2 Cr 0.5 Mo 0.5 alloy with half Cr and half Mo, which is ascribed to a moderate lattice misfit ( ε  = 0.94%) between BCC and B2 phases. It is due to the special coherent microstructure that results in a prominent mechanical property with the highest compressive yield strength ( σ YS  = 1314 MPa) and good plasticity among these alloys, while coarse Cr 2 Ti and Zr 5 Al 3 particles are existed in 873 K-aged alloy with Cr 1 . After 1073 K aging, all these alloys with Cr 1 , Cr 0.5 Mo 0.5 and Mo 1 consist of BCC, B2 and Zr 5 Al 3 , in which BCC/B2 coherent microstructure is destabilized. The strengthening mechanism of BCC/B2 coherent microstructure in 873 K-aged alloy with Cr 0.5 Mo 0.5 was also discussed. Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-022-01971-w