Stability of ordered L12 and B2 precipitates in face centered cubic based high entropy alloys - Al0.3CoFeCrNi and Al0.3CuFeCrNi2

Adding a small amount of Al to the well-known high entropy alloy (HEA), Al0.1CoCrFeNi, to form Al0.3CoCrFeNi, leads to the precipitation of highly refined ordered L12 precipitates, which are stable at 550°C. However, the L12 precipitates (stoichiometry of (Ni,Cr)3(Al,Fe,Co)) are de-stabilized and re...

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Published inScripta materialia Vol. 123; pp. 130 - 134
Main Authors Gwalani, B., Soni, V., Choudhuri, D., Lee, M., Hwang, J.Y., Nam, S.J., Ryu, H., Hong, S.H., Banerjee, R.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2016
Subjects
Alloys
Atom probe tomography
Entropy
High entropy alloys
L12
Phases
Positioning
Precipitates
Precipitation
Solute partitioning
Stability
Stoichiometry
High entropy alloys
Solute partitioning
L12
Atom probe tomography
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Summary:Adding a small amount of Al to the well-known high entropy alloy (HEA), Al0.1CoCrFeNi, to form Al0.3CoCrFeNi, leads to the precipitation of highly refined ordered L12 precipitates, which are stable at 550°C. However, the L12 precipitates (stoichiometry of (Ni,Cr)3(Al,Fe,Co)) are de-stabilized and replaced by coarser B2 precipitates on annealing at 700°C. Contrastingly, in the Co-free, Al0.3CuCrFeNi2 high entropy alloy, the L12 precipitates are stable at both 550°C (~5nm) and 700°C (~50nm), and exhibit a stoichiometry of (Ni,Cu)3(Al,Fe,Cr). These results lead to interesting insights into the stability of ordered phases in HEAs as a function of composition and temperature. [Display omitted]
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.06.019