Unusual dislocation behavior in high-entropy alloys

This Viewpoint article articulates ten unusual features associated with dislocations and their slip processes in high-entropy alloys (HEAs). Attention will be directed towards the composition undulation almost inevitable in these highly concentrated solutions, even when the alloy is a single-phase a...

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Published inScripta materialia Vol. 181; pp. 127 - 133
Main Author Ma, Evan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2020
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Online AccessGet full text
ISSN1359-6462
1872-8456
DOI10.1016/j.scriptamat.2020.02.021

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Abstract This Viewpoint article articulates ten unusual features associated with dislocations and their slip processes in high-entropy alloys (HEAs). Attention will be directed towards the composition undulation almost inevitable in these highly concentrated solutions, even when the alloy is a single-phase and nominally random solution. This inhomogeneity is often exacerbated by lattice distortion and local chemical order arising from the interaction among multiple principal elements. As a consequence, dislocation motion faces a rugged atomic and energy landscape, presenting new twists in defect energetics and properties, as well as cocktail strengthening as a new form of solid solution hardening beyond the conventional mechanism. Our systematic account from this standpoint may help answer the continual query in the community as to what is special about these HEAs that makes them different from traditional solid solutions. A dislocation moving in a face-centered-cubic high-entropy alloy. [Display omitted]
AbstractList This Viewpoint article articulates ten unusual features associated with dislocations and their slip processes in high-entropy alloys (HEAs). Attention will be directed towards the composition undulation almost inevitable in these highly concentrated solutions, even when the alloy is a single-phase and nominally random solution. This inhomogeneity is often exacerbated by lattice distortion and local chemical order arising from the interaction among multiple principal elements. As a consequence, dislocation motion faces a rugged atomic and energy landscape, presenting new twists in defect energetics and properties, as well as cocktail strengthening as a new form of solid solution hardening beyond the conventional mechanism. Our systematic account from this standpoint may help answer the continual query in the community as to what is special about these HEAs that makes them different from traditional solid solutions. A dislocation moving in a face-centered-cubic high-entropy alloy. [Display omitted]
Author Ma, Evan
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SubjectTerms Concentration inhomogeneity
Dislocations
High entropy alloys
Stacking faults
Strength
Title Unusual dislocation behavior in high-entropy alloys
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