Shear stress- and line length-dependent screw dislocation cross-slip in FCC Ni

Xu, Shuozhi; Xiong, Liming; Chen, Youping; McDowell, David L.

doi:10.1016/j.actamat.2016.10.005

Shear stress- and line length-dependent screw dislocation cross-slip in FCC Ni

Journal Article · Fri Oct 14 00:00:00 EDT 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.10.005· OSTI ID:1533453

^[1]; Xiong, Liming ^[2]; Chen, Youping ^[3]; McDowell, David L. ^[4]

Georgia Institute of Technology, Atlanta, GA (United States). GWW School of Mechanical Engineering; DOE/OSTI
Iowa State Univ., Ames, IA (United States). Dept. of Aerospace Engineering
Univ. of Florida, Gainesville, FL (United States). Dept. of Mechanical and Aerospace Engineering
Georgia Institute of Technology, Atlanta, GA (United States). GWW School of Mechanical Engineering. School of Materials Science and Engineering

Screw dislocation cross-slip is important in dynamic recovery of deformed metals. A mobile screw dislocation segment can cross slip to annihilate an immobile screw dislocation segment with opposite Burgers vector, leaving excess dislocations of one kind in a crystal. Previous studies have found that the cross-slip process depends on both the local stress state and dislocation line length, yet a quantitative study of the combined effects of these two factors has not been conducted. In this work, we employ both dynamic concurrent atomistic-continuum (CAC) [L. Xiong, G. Tucker, D.L. McDowell, Y. Chen, J. Mech. Phys. Solids 59 (2011) 160–177] and molecular dynamics simulations to explore the shear stress- and line length-dependent screw dislocation cross-slip in face-centered cubic Ni. It is demonstrated that the CAC approach can accurately describe the 3-D cross-slip process at a significantly reduced computational cost, as a complement to other numerical methods. In particular, we show that the Fleischer (FL) [R.L. Fleischer, Acta Metall. 7 (1959) 134–135] type cross-slip, in which a stair-rod dislocation is involved, can be simulated in the coarse-grained domain. Our simulations show that as the applied shear stress increases, the cross-slip mechanism changes from the Friedel-Escaig (FE) [B. Escaig, J. Phys. 29 (1968) 225–239] type to the FL type. In addition, the critical shear stress for both cross-slip mechanisms depends on the dislocation line length. Moreover, the cross-slip of a screw dislocation with a length of 6.47 nm analyzed using periodic boundary conditions occurs via only the FL mechanism, whereas a longer dislocation with length of 12.94 nm can cross-slip via either the FE or FL process in Ni subject to different shear stresses.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0006539

OSTI ID:: 1533453

Alternate ID(s):: OSTI ID: 22643526
OSTI ID: 1398624

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 122; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Shear stress- and line length-dependent screw dislocation cross-slip in FCC Ni

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