Effects of quenching rate on crack propagation in NiAl alloy using molecular dynamics

Po Hsien Sung, Tei Chen Chen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The crack growth and propagation of pre-cracked NiAl alloy prepared at different quenching rates under mode I loading conditions were investigated using molecular dynamics (MD) simulation based on the many-body embedded atom method (EAM) potential. The quench rate effects were evaluated in terms of atomic trajectories, common neighbor analysis (CNA), radical distribution function (RDF) and glass transition. The simulation results clearly show that as the quenching rate increases ten times from 0.5 K/ps to 50 K/ps, the volume after quenching will increase by approximately 1%. The amorphous structure and crystalline structure exhibit two distinct types of fracture behavior between quenching rates of 0.25-50 K/ps. In the amorphous state, the critical stress increases with decreasing quenching rate. Moreover, two shear bands and the shear transformation zones (STZ) extend along a direction of about 45° with respect to the horizontal direction away from the crack tip.

Original languageEnglish
Pages (from-to)13-17
Number of pages5
JournalComputational Materials Science
Volume114
DOIs
Publication statusPublished - 2016 Mar 1

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

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