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Title: The softening factor cb of commercial titanium alloy wires

Abstract

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 cb that characterizes the microstructural scale responsible for the observed plasticity and work hardening behavior. The softening factor cb is found to be independent of strain-rate for the Ti-alloy wires of this study. It is proposed that cb !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 cb-value of 14 is calculated for Ti-6Al-4V that is consistent with >10 % plasticity during work hardening whereas a high cb-value of 135 for Ti-6Al-7Nb corresponds with <4 % plasticity.

Authors:
 [1];  [1];  [1];  [1];  [2]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1575255
Report Number(s):
SAND-2019-13934J
Journal ID: ISSN 1862-5282; 681449; TRN: US2001219
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Materials Research
Additional Journal Information:
Journal Volume: 110; Journal Issue: 11; Journal ID: ISSN 1862-5282
Publisher:
Carl Hanser Verlag GmbH & Co. KG
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Softening factor; Work hardening; Plastic strain; Ti alloys

Citation Formats

Jankowski, Alan F., Chames, J. M., Gardea, A., Nishimoto, R., and Brannigan, E. M. The softening factor cb of commercial titanium alloy wires. United States: N. p., 2019. Web. doi:10.3139/146.111834.
Jankowski, Alan F., Chames, J. M., Gardea, A., Nishimoto, R., & Brannigan, E. M. The softening factor cb of commercial titanium alloy wires. United States. https://doi.org/10.3139/146.111834
Jankowski, Alan F., Chames, J. M., Gardea, A., Nishimoto, R., and Brannigan, E. M. Tue . "The softening factor cb of commercial titanium alloy wires". United States. https://doi.org/10.3139/146.111834. https://www.osti.gov/servlets/purl/1575255.
@article{osti_1575255,
title = {The softening factor cb of commercial titanium alloy wires},
author = {Jankowski, Alan F. and Chames, J. M. and Gardea, A. and Nishimoto, R. and Brannigan, E. M.},
abstractNote = {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 cb that characterizes the microstructural scale responsible for the observed plasticity and work hardening behavior. The softening factor cb is found to be independent of strain-rate for the Ti-alloy wires of this study. It is proposed that cb !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 cb-value of 14 is calculated for Ti-6Al-4V that is consistent with >10 % plasticity during work hardening whereas a high cb-value of 135 for Ti-6Al-7Nb corresponds with <4 % plasticity.},
doi = {10.3139/146.111834},
journal = {International Journal of Materials Research},
number = 11,
volume = 110,
place = {United States},
year = {2019},
month = {11}
}

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