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Journal of Materials Engineering and Performance

, Volume 28, Issue 8, pp 4918–4930 | Cite as

Molecular Dynamics Simulation Study of Uniaxial Ratcheting Behaviors for Ultrafine-Grained Nanocrystalline Nickel

  • Snehanshu PalEmail author
  • Karanam Gururaj
  • Md. Meraj
  • Ravindra Giriraj Bharadwaj
Article
  • 168 Downloads

Abstract

In this paper, molecular dynamics (MD) simulation-based study of deformation behavior of ultrafine-grained nanocrystalline nickel under asymmetric cyclic loading having stress ratios (R) such as − 0.2, − 0.4 and − 0.6 for different temperatures, viz. 100, 300 and 500 K, has been performed using embedded atom method potential. The predicted ratcheting strain by MD simulation for nanocrystalline Ni varies from 15 to 30%. A significant increase in ratcheting strain has been observed with the increase in temperature. It has been observed that the number of vacancies increases, and the number of clusters decreases with the increase in temperature. Slight reduction in crystallinity is identified at the middle of the each loading cycle from the performed cluster analysis. Zigzag pattern of dislocation density has been observed and leads to the decrease in dislocation density with the increase in temperature. Stress ratio does not show any significant effect on the number of vacancies, clusters and dislocation density on structural evolution during the asymmetric cyclic loading. Slight change in the grain rotation has been observed with the increase in temperature, and there is almost no change in the final texture evolved. From the post-tensile tests, ultimate tensile strength that remains same may be due to constant average dislocation density.

Keywords

molecular dynamics nanocrystalline ratcheting stress ratio 

Notes

Supplementary material

11665_2019_4256_MOESM1_ESM.docx (1.3 mb)
Supplementary material 1 (DOCX 1315 kb)

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Snehanshu Pal
    • 1
    Email author
  • Karanam Gururaj
    • 1
  • Md. Meraj
    • 1
    • 2
  • Ravindra Giriraj Bharadwaj
    • 3
  1. 1.Department of Metallurgical and Materials EngineeringNational Institute of Technology RourkelaRourkelaIndia
  2. 2.Department of Mechanical EngineeringG H Raisoni Academy of Engineering and TechnologyNagpurIndia
  3. 3.Department of Mechanical EngineeringUniversity of California RiversideRiversideUSA

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