Theory of twin strengthening in fcc high entropy alloys

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{
  "revision": 6, 
  "id": "1078", 
  "created": "2021-10-26T12:31:29.481353+00:00", 
  "metadata": {
    "doi": "10.24435/materialscloud:h4-0e", 
    "status": "published", 
    "title": "Theory of twin strengthening in fcc high entropy alloys", 
    "mcid": "2021.174", 
    "license_addendum": null, 
    "_files": [
      {
        "description": "Scripts and data used in the described publication with a README file with folder descriptions", 
        "key": "Kubilay_twin.tar.gz", 
        "size": 441447441, 
        "checksum": "md5:df19bead1a5a64df34a797c5f985092b"
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      {
        "description": "README file", 
        "key": "README.txt", 
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        "checksum": "md5:ad9021f58912390a79d4bfe2517555e9"
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    ], 
    "owner": 568, 
    "_oai": {
      "id": "oai:materialscloud.org:1078"
    }, 
    "keywords": [
      "Twinning", 
      "Solute strengthening", 
      "Random alloys", 
      "SNSF"
    ], 
    "conceptrecid": "1077", 
    "is_last": true, 
    "references": [
      {
        "type": "Journal reference", 
        "doi": "10.1016/j.actamat.2021.117119", 
        "url": "https://www.sciencedirect.com/science/article/pii/S1359645421004997", 
        "comment": "", 
        "citation": "R. E. Kubilay, W. A. Curtin, Acta Materialia, 216, 117119 (2021)"
      }
    ], 
    "publication_date": "Oct 28, 2021, 10:49:56", 
    "license": "Creative Commons Attribution 4.0 International", 
    "id": "1078", 
    "description": "Twinning in fcc High Entropy Alloys (HEAs) has been implicated as a possible mechanism for hardening that enables enhanced ductility. Here, a theory for the twinning stress is developed analogous to recent theories for yield stress. Specifically, the stress to move a twin dislocation, i.e an fcc partial dislocation moving along a pre-existing twin boundary, through a random multicomponent alloy is determined. A reduced elasticity theory is then introduced in which atoms interact with the twin dislocation pressure field and the twin boundary. The theory is applied to NiCoCr using results from both interatomic potentials and elasticity theory. Results are also used to predict the increased stress for the motion of (i) a single partial dislocation leaving a trailing stacking fault and (ii) adjacent partial dislocations involved in twin nucleation. Increased strength is predicted for all processes involved in the nucleation and growth of fcc twins. Comparison to single-crystal experiments at room temperature then suggests that twinning is controlled by twin nucleation, with reasonable quantitative agreement. When solute/fault interactions are neglected, the theory shows that twinning and lattice flow stresses are related. The theory also provides insight into how other dilute solute additions could suppress twinning, as found experimentally.", 
    "version": 1, 
    "contributors": [
      {
        "email": "recep.kubilay@epfl.ch", 
        "affiliations": [
          "Laboratory for Multiscale Mechanics Modeling, Institute of Mechanical Engineering, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "familyname": "Kubilay", 
        "givennames": "Recep Ekin"
      }, 
      {
        "email": "william.curtin@epfl.ch", 
        "affiliations": [
          "Laboratory for Multiscale Mechanics Modeling, Institute of Mechanical Engineering, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "familyname": "Curtin", 
        "givennames": "W.A."
      }
    ], 
    "edited_by": 100
  }, 
  "updated": "2021-10-28T08:49:56.558750+00:00"
}