Processing, microstructure and properties of Al0.6CoNiFeTi0.4 high entropy alloy with nanoscale twins

Al0.6CoNiFeTi0.4 high entropy alloy was synthesized by mechanical alloying (MA) and spark plasma sintering (SPS). Only a FCC structure phase during MA was observed, while an ordered BCC phase and a FCC phase after SPS. The ordered BCC phase was much finer than the FCC phase after SPS. Moreover, twin...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 565; pp. 439 - 444
Main Authors Chen, Weiping, Fu, Zhiqiang, Fang, Sicong, Wang, Yanping, Xiao, Huaqiang, Zhu, Dezhi
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier B.V 10.03.2013
Elsevier
Subjects
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals; microstructure
Elasticity, elastic constants
Exact sciences and technology
Grain and twin boundaries
High entropy alloys
Mechanical alloying
Mechanical and acoustical properties of condensed matter
Mechanical properties of nanoscale materials
Mechanical properties of solids
Metals. Metallurgy
Nanoscale twins
Physics
Powder metallurgy. Composite materials
Production techniques
Spark plasma sintering
Structure of solids and liquids; crystallography
Technology
High entropy alloys
Spark plasma sintering
Nanoscale twins
Mechanical alloying
high entropy alloy
Crystal twin
Vickers hardness
FCC lattices
Material processing
Elasticity
Mechanical properties
Fracture
Twinning
Nanostructure
Crystal defect
Intergranular fracture
Nanometer scale
Compressive stress
BCC lattices
Yield strength
Elastic properties
Microstructure
Yield stress
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Summary:Al0.6CoNiFeTi0.4 high entropy alloy was synthesized by mechanical alloying (MA) and spark plasma sintering (SPS). Only a FCC structure phase during MA was observed, while an ordered BCC phase and a FCC phase after SPS. The ordered BCC phase was much finer than the FCC phase after SPS. Moreover, twinning occurred only in the FCC phase during the SPS process. Al0.6CoNiFeTi0.4 high entropy alloy with a density of 98.2% and nanoscale twins exhibits excellent mechanical properties at room temperature. The yield stress, compressive strength and Vickers hardness of the alloy are 2732MPa, 3172MPa, 10.1% and 712±12HV, respectively. The fracture mechanism of this alloy is observed as intergranular fracture.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2012.12.072