The softening factor cb of commercial titanium alloy wires

doi:10.3139/146.111834

This content will become publicly available on November 12, 2020

Title: The softening factor c _b of commercial titanium alloy wires

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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 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.

Authors:

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)

Publication Date:: 2019-11-12

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

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

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.

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                    Jankowski, Alan F., Chames, J. M., Gardea, A., Nishimoto, R., & Brannigan, E. M. The softening factor cb of commercial titanium alloy wires.  United States.  doi:10.3139/146.111834.

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                    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.  doi:10.3139/146.111834.

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@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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This content will become publicly available on November 12, 2020

Title: The softening factor c b of commercial titanium alloy wires

Abstract

Citation Formats

Title: The softening factor c _b of commercial titanium alloy wires