The softening factor cb of commercial titanium alloy wires

Jankowski, Alan F.; Chames, J. M.; Gardea, A.; Nishimoto, R.; Brannigan, E. M.

doi:10.3139/146.111834

The softening factor c_b of commercial titanium alloy wires

Journal Article · Tue Nov 12 00:00:00 EST 2019 · International Journal of Materials Research

DOI:https://doi.org/10.3139/146.111834· OSTI ID:1575255

Jankowski, Alan F. ^[1]; Chames, J. M. ^[1]; Gardea, A. ^[1]; Nishimoto, R. ^[1]; Brannigan, E. M. ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The strain-rate sensitivity exponent m and activation volume υ* are often used to characterize the strain-rate sensitivity of strength behavior in metals and alloys. Complications can arise when the m and υ* values become indeterminate, due to factors such as an inherent scatter in the mechanical property data. Here, the study of commercial Ti-alloy wires is considered wherein to overcome this limitation, the formulation of the Kocks–Mecking (K–M) model is modified to provide a parameter c_b that characterizes the microstructural scale responsible for the observed plasticity and work hardening behavior. The softening factor c_b is found to be independent of strain-rate for the Ti-alloy wires of this study. It is proposed that c_b !can offer a versatile and complementary computation to the activation volume υ* since its formulation includes the yield and ultimate strength values along with the plastic strain. For the tensile testing of Ti-alloy wires, a low c_b-value of 14 is calculated for Ti-6Al-4V that is consistent with >10 % plasticity during work hardening whereas a high c_b-value of 135 for Ti-6Al-7Nb corresponds with <4 % plasticity.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

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

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1575255

Report Number(s):: SAND--2019-13934J; 681449

Journal Information:: International Journal of Materials Research, Journal Name: International Journal of Materials Research Journal Issue: 11 Vol. 110; ISSN 1862-5282

Publisher:: Carl Hanser Verlag GmbH & Co. KGCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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