Dynamic deformation and failure of ultrafine-grained titanium

Li, Zezhou; Wang, Bingfeng; Zhao, Shiteng; Valiev, Ruslan Z.; Vecchio, Kenneth S.; Meyers, Marc A.

doi:10.1016/j.actamat.2016.11.041

Dynamic deformation and failure of ultrafine-grained titanium

Journal Article · Fri Dec 09 23:00:00 EST 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.11.041· OSTI ID:1533461

Li, Zezhou ^[1]; Wang, Bingfeng ^[2]; Zhao, Shiteng ^[3]; Valiev, Ruslan Z. ^[4]; Vecchio, Kenneth S. ^[3]; ^[3]

Univ. of California, San Diego, CA (United States); DOE/OSTI
Central South Univ., Changsha (China)
Univ. of California, San Diego, CA (United States)
Ufa State Aviation Technical Univ. (Russian Federation). Inst. of Physics of Advanced Materials

Dynamic deformation and shear localization of ultrafine-grained (~120 nm) pure titanium are examined. The strain hardening can be considered as having two regimes: below and above a strain ~0.04; at this point there is a drastic decrease in the slope. The strain-rate sensitivity of ultrafine-grained titanium is found to be approximately the same as its coarse grained counterpart. Based on experimentally determined parameters, the Zerilli-Armstrong equation is modified to describe the mechanical response of the ultrafine-grained titanium over the strain rate range 10^-5 to 10³ s^-1. Adiabatic shear banding is examined in a forced shear configuration where large strain is imposed in a narrow region. The microstructure inside the adiabatic shear band consists of a mixture of elongated grains and equiaxed nanograins (~40 nm) that are significantly smaller than the initial grains (~120 nm). The formation of equiaxed nanograins is modeled through a mechanism of rotational dynamic recrystallization. This further reduction in grain size from the one generated by ECAP is interpreted in terms of the Zener-Hollomon parameter for quasistatic and dynamic deformation. The adiabatic shear band eventually fractures by a combination of brittle and ductile failure.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002080

OSTI ID:: 1533461

Alternate ID(s):: OSTI ID: 1419128

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 125; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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