Influence of strain on the formation of cold-rolling and grain growth textures of an equiatomic HfZrTiTaNb refractory high entropy alloy

Influence of strain on the formation of cold-rolling and grain growth textures of an equiatomic HfZrTiTaNb refractory high entropy alloy

The effect of cold-rolling strain on the evolution of deformation and grain growth textures in an equiatomic HfZrTiTaNb refractory high entropy alloy (RHEA) was investigated. For this purpose, the development of microstructure and texture was compared in 50% and 90% cold-rolled materials. The develo...

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Bibliographic Details
Published in:Materials characterization Vol. 136; pp. 286 - 292
Main Authors: Eleti, R.R., Raju, V., Veerasham, M., Reddy, S.R., Bhattacharjee, P.P.
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01-02-2018
Subjects:
ALLOY SYSTEMS
ANNEALING
BCC LATTICES
Cold-rolling
DEFORMATION
DENSITY
ENTROPY
FIBERS
HAFNIUM COMPOUNDS
MATERIALS SCIENCE
MICROSTRUCTURE
NIOBIUM COMPOUNDS
Refractory high entropy alloys
Texture
THALLIUM COMPOUNDS
TITANIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
Refractory high entropy alloys
Annealing
Cold-rolling
Texture
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Summary:The effect of cold-rolling strain on the evolution of deformation and grain growth textures in an equiatomic HfZrTiTaNb refractory high entropy alloy (RHEA) was investigated. For this purpose, the development of microstructure and texture was compared in 50% and 90% cold-rolled materials. The development of deformation microstructure was accompanied by the formation of extensive deformation heterogeneities. The 90% cold-rolled material showed ultrafine lamellar regions as well as regions severely fragmented by the fine scale deformation heterogeneities. The 50% cold-rolled material showed dominant ND-fiber (ND// ), while the 90% cold-rolled material showed presence of both RD (RD// ) and ND-fiber components. Profuse deformation heterogeneities presumably weakened the deformation texture considerably. The annealing texture of the 50% and 90% cold-rolled material showed stronger {111} component. Comparison of the annealing texture of the 50% and 90% cold-rolled materials with other BCC HEA phases indicated much weaker texture. The annealing texture of the RHEA was not significantly strengthened by increasing cold-rolling strain, presumably due to the high density of deformation heterogeneities in the cold-rolled microstructure. Thus, deformation heterogeneities significantly influenced the formation of cold-rolling and annealing textures of the equiatomic HfZrTiTaNb RHEA. •Effect of strain on Texture formation is reported in HfZrTiTaNb for the first time.•Cold-rolled microstructure shows high density of deformation heterogeneities.•Weak texture compared to other BCC phases in HEAs•Imposed strain does not affect texture significantly unlike other BCC materials.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2017.12.034