The behaviour of niobium and molybdenum during uni-axial strain loadingCitation formats

  • Authors:
  • J C F Millett
  • M Cotton
  • N K Bourne
  • N T Park
  • G Whiteman

Standard

The behaviour of niobium and molybdenum during uni-axial strain loading. / Millett, J C F; Cotton, M; Bourne, N K; Park, N T; Whiteman, G.

In: Journal of Applied Physics, Vol. 115, No. 7, 2014.

Research output: Contribution to journalArticle

Harvard

Millett, JCF, Cotton, M, Bourne, NK, Park, NT & Whiteman, G 2014, 'The behaviour of niobium and molybdenum during uni-axial strain loading', Journal of Applied Physics, vol. 115, no. 7. https://doi.org/10.1063/1.4838037

APA

Millett, J. C. F., Cotton, M., Bourne, N. K., Park, N. T., & Whiteman, G. (2014). The behaviour of niobium and molybdenum during uni-axial strain loading. Journal of Applied Physics, 115(7). https://doi.org/10.1063/1.4838037

Vancouver

Millett JCF, Cotton M, Bourne NK, Park NT, Whiteman G. The behaviour of niobium and molybdenum during uni-axial strain loading. Journal of Applied Physics. 2014;115(7). https://doi.org/10.1063/1.4838037

Author

Millett, J C F ; Cotton, M ; Bourne, N K ; Park, N T ; Whiteman, G. / The behaviour of niobium and molybdenum during uni-axial strain loading. In: Journal of Applied Physics. 2014 ; Vol. 115, No. 7.

Bibtex

@article{9cd8a5275d024065b60adc06eb32a792,
title = "The behaviour of niobium and molybdenum during uni-axial strain loading",
abstract = "The mechanical response of niobium and molybdenum during one dimensional shock loading in the weak shock regime is investigated in terms of the Hugoniot elastic limit (dynamic yield) and spall (tensile) strengths. Results indicate that although both metals have high elastic limits of ca. 2 GPa, their responses are very different. Deformation in the weak shock regime in niobium is controlled by both the motion and generation of dislocations, resulting in high spall (dynamic tensile) strengths and ductility. In contrast, molybdenum has low spall strength and ductility, which suggests lower dislocation mobility in this metal. We have also shown that the strain-rate in the rising part of the shock front is related to the stress amplitude by the fourth power, as first shown by Swegle and Grady. Although we have not been able to elucidate further on the power relation, we believe that the scaling factor A is related to a materials ability to accommodate shock imposed plasticity via slip and dislocation generation. Overall, we have used arguments about the Peierls stress in body centred cubic metals to explain these results, with niobium (low Peierls stress) having a high dislocation mobility, resulting in behaviour showing some similarities to face centred cubic metals. Molybdenum, with its much higher Peierls stress has a much lower dislocation mobility, and hence lower spall strengths and ductility.",
keywords = "stacking-fault energy, dislocation cell-size, shock-loaded nickel, cu-al, alloys, substructure evolution, mechanical-behavior, pulse duration, tungsten alloy, shear-strength, spall strength",
author = "Millett, {J C F} and M Cotton and Bourne, {N K} and Park, {N T} and G Whiteman",
note = "ISI Document Delivery No.: AB8LP Times Cited: 1 Cited Reference Count: 51 Millett, J. C. F. Cotton, M. Bourne, N. K. Park, N. T. Whiteman, G. Amer inst physics Melville",
year = "2014",
doi = "10.1063/1.4838037",
language = "English",
volume = "115",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics",
number = "7",

}

RIS

TY - JOUR

T1 - The behaviour of niobium and molybdenum during uni-axial strain loading

AU - Millett, J C F

AU - Cotton, M

AU - Bourne, N K

AU - Park, N T

AU - Whiteman, G

N1 - ISI Document Delivery No.: AB8LP Times Cited: 1 Cited Reference Count: 51 Millett, J. C. F. Cotton, M. Bourne, N. K. Park, N. T. Whiteman, G. Amer inst physics Melville

PY - 2014

Y1 - 2014

N2 - The mechanical response of niobium and molybdenum during one dimensional shock loading in the weak shock regime is investigated in terms of the Hugoniot elastic limit (dynamic yield) and spall (tensile) strengths. Results indicate that although both metals have high elastic limits of ca. 2 GPa, their responses are very different. Deformation in the weak shock regime in niobium is controlled by both the motion and generation of dislocations, resulting in high spall (dynamic tensile) strengths and ductility. In contrast, molybdenum has low spall strength and ductility, which suggests lower dislocation mobility in this metal. We have also shown that the strain-rate in the rising part of the shock front is related to the stress amplitude by the fourth power, as first shown by Swegle and Grady. Although we have not been able to elucidate further on the power relation, we believe that the scaling factor A is related to a materials ability to accommodate shock imposed plasticity via slip and dislocation generation. Overall, we have used arguments about the Peierls stress in body centred cubic metals to explain these results, with niobium (low Peierls stress) having a high dislocation mobility, resulting in behaviour showing some similarities to face centred cubic metals. Molybdenum, with its much higher Peierls stress has a much lower dislocation mobility, and hence lower spall strengths and ductility.

AB - The mechanical response of niobium and molybdenum during one dimensional shock loading in the weak shock regime is investigated in terms of the Hugoniot elastic limit (dynamic yield) and spall (tensile) strengths. Results indicate that although both metals have high elastic limits of ca. 2 GPa, their responses are very different. Deformation in the weak shock regime in niobium is controlled by both the motion and generation of dislocations, resulting in high spall (dynamic tensile) strengths and ductility. In contrast, molybdenum has low spall strength and ductility, which suggests lower dislocation mobility in this metal. We have also shown that the strain-rate in the rising part of the shock front is related to the stress amplitude by the fourth power, as first shown by Swegle and Grady. Although we have not been able to elucidate further on the power relation, we believe that the scaling factor A is related to a materials ability to accommodate shock imposed plasticity via slip and dislocation generation. Overall, we have used arguments about the Peierls stress in body centred cubic metals to explain these results, with niobium (low Peierls stress) having a high dislocation mobility, resulting in behaviour showing some similarities to face centred cubic metals. Molybdenum, with its much higher Peierls stress has a much lower dislocation mobility, and hence lower spall strengths and ductility.

KW - stacking-fault energy

KW - dislocation cell-size

KW - shock-loaded nickel

KW - cu-al

KW - alloys

KW - substructure evolution

KW - mechanical-behavior

KW - pulse duration

KW - tungsten alloy

KW - shear-strength

KW - spall strength

U2 - 10.1063/1.4838037

DO - 10.1063/1.4838037

M3 - Article

VL - 115

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 7

ER -