Role of W on the Dislocation Evolution in Ni-W Alloy During Tension Followed by Compression Loading

M Meraj and N Yedla and S Pal, METALS AND MATERIALS INTERNATIONAL, 22, 373-382 (2016).

DOI: 10.1007/s12540-016-5551-6

In this paper, we report deformation behavior during tension followed by compression loading for Nickel and Nickel-Tungsten alloy (15 at% W) single crystals using molecular dynamics simulations to investigate the role of W on the dislocation evolution in Ni-W alloy. The stress-strain responses of single crystals under uniaxial tension followed by compression loading after different pre-strains (i.e. 0.10 and 0.20 true strains for pure Ni; 0.10 and 0.24 true strains for Ni-15 at% W alloy) are simulated at strain rate of 10(8) s(-1) and at the temperature of 300 K. Dislocation mobility, dislocation-dislocation interaction and dislocation-twin interactions are thoroughly investigated to evaluate their influence on deformation behaviour during reverse loading. Slip dominated deformation mechanism prevails during forward loading but both twin and slip are found to be operative during reverse loading for Ni single crystal. It is observed that the dominant deformation mechanism is twin for both forward and reverse loading in case of Ni-15 at% W alloy single crystal.

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