Intrinsic size dependent plasticity in BCC micro-pillars under uniaxial tension and pure torsion

Ryu, Ill; Gravell, J. D.; Cai, Wei; Nix, William D.; Gao, Huajian

doi:10.1016/j.eml.2020.100901

Intrinsic size dependent plasticity in BCC micro-pillars under uniaxial tension and pure torsion

Journal Article · Mon Aug 03 00:00:00 EDT 2020 · Extreme Mechanics Letters

DOI:https://doi.org/10.1016/j.eml.2020.100901· OSTI ID:1849545

^[1]; Gravell, J. D. ^[2]; Cai, Wei ^[3]; Nix, William D. ^[4]; Gao, Huajian ^[5]

Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Mechanical Engineering; Univ. of Texas at Dallas, Richardson, TX (United States)
Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Mechanical Engineering
Stanford Univ., CA (United States). Dept. of Mechanical Engineering
Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
Nanyang Technological Univ. (Singapore). College of Engineering. School of Mechanical and Aerospace Engineering; Agency for Science, Technology and Research (A*STAR) (Singapore). Inst. of High Performance Computing

The mechanical behavior of submicron body-centered cubic (BCC) micro-pillars is investigated by three-dimensional dislocation dynamics (DD) simulations to better understand the governing mechanisms for size dependent plasticity under uniaxial tension and pure torsion. A formula is developed to compute the incremental plastic twist due to dislocation motion in DD simulations. The DD simulations show that different dislocation microstructures are created depending on the loading conditions, which leads to different size dependent mechanical behavior. While in tension plasticity is mainly governed by the kinetics of dislocation motion controlled partly by the surface dislocation sources, plastic flow in torsion is controlled by dislocation pile-ups associated with strain gradients. The simulation results also reveal a Bauschinger effect and plastic recovery under cyclic twist, which have been observed in recent experiments.

View Accepted Manuscript (DOE)

Research Organization:: Brown Univ., Providence, RI (United States); Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER46163; SC0007074; SC0010412

OSTI ID:: 1849545

Alternate ID(s):: OSTI ID: 1646531

Journal Information:: Extreme Mechanics Letters, Journal Name: Extreme Mechanics Letters Journal Issue: C Vol. 40; ISSN 2352-4316

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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