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Exceptionally high spallation strength for a high-entropy alloy demonstrated by experiments and simulations

Journal Article · · Journal of Alloys and Compounds
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [1]
  1. Clausthal Univ. of Technology (Germany). Inst. of Applied Mechanics
  2. Univ. of California, Berkeley, CA (United States)
  3. National Scientific and Technical Research Council (CONICET), Mendoza (Argentina); Univ. of Mendoza (Argentina)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). National Ignition Facility
  5. Univ. Kaiserslautern (Germany). Research Center OPTIMAS
  6. Univ. of California San Diego, La Jolla, CA (United States)
  7. National Scientific and Technical Research Council (CONICET), Mendoza (Argentina); Univ. of Mendoza (Argentina); Univ. Mayor, Santiago (Chile). Centro de Nanotecnología Aplicada
High-entropy alloys are materials with an increasing number of technological applications. Amongst them, the Cantor alloy, FeMnCoCrNi, shows desirable mechanical properties at normal loading conditions. In this study we focus on the performance of the Cantor alloy at the ultra-high deformation rates of shock waves. We study shock-induced spallation using both experiments and atomistic simulations. Experimental loading is achieved using high power laser, with VISAR to obtain velocity profiles and spall strength, followed by transmission electron microscopy of the recovered samples. Molecular Dynamics (MD) simulations of shock-induced spallation are compared with experiments. Both experiments and simulations show a high spall strength which would be beneficial for certain applications, with experiments giving ~8 GPa at ~107s-1 and MD giving almost ~30 GPa at ~109s-1. The difference between experiments and simulations can be explained by the difference in strain rate. Post-mortem analysis of the experimental samples shows nanotwins near the spall plane, while MD simulations show a highly disordered region giving rise to void nucleation and spall during loading.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
UNCuyo; USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1843121
Alternate ID(s):
OSTI ID: 1862618
Report Number(s):
LLNL-JRNL-825521; 1039452
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: no. 1 Vol. 895; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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