4.7 Article

Molecular dynamics study of tension-compression asymmetry of nanocrystal α-Ti with stacking fault

Journal

MATERIALS & DESIGN
Volume 127, Issue -, Pages 204-214

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.04.076

Keywords

Molecular dynamics simulation; Stacking fault; Tension-compression asymmetry; Mechanical property enhancement

Funding

  1. National Natural Science Foundation of China [11372256, 11527803, 11572259]
  2. 111 project [B07050]
  3. Program for International Cooperation and Exchanges of Shaanxi Province [2016KW-049]

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Molecular dynamics simulations are performed to investigate the effect of stacking fault (SF) boundary, loading condition and temperature on the mechanical behaviour of nanocrystalline titanium. The results indicate that the yield stress and flow stress present tension-compression asymmetry. The asymmetry is due to the different deformation mechanisms: formation of basal/prismatic interface and motion of SFs in twin grains in tension, and the blockage of SF boundary to the fcc-Ti phase boundary in compression. At the same time, the results show that influence of SF on yield stress and flow stress is slight under tensile loading, regardless of temperature and SF spacing. In contrary, the SF boundaries enhance the yield stress and flow stress of nanocrystal Ti under compressive loading. The general conclusions derived from present work may provide a guideline for the design of high-performance nanocrystal Ti.

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