Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy

S. Y. Chen; L. Wang; W. D. Li; Y. Tong; K. K. Tseng; C. W. Tsai; J. W. Yeh; Y. Ren; W. Guo; J. D. Poplawsky; P. K. Liaw

doi:10.1080/21663831.2019.1658233

Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy

S. Y. Chen, L. Wang, W. D. Li, Y. Tong, K. K. Tseng, C. W. Tsai, J. W. Yeh, Y. Ren, W. Guo, J. D. Poplawsky, P. K. Liaw

Materials MicroAnalysis

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Abstract

The temperature effect on the mechanical behavior of the HfNbTaTiZr high entropy alloy (HEA) was investigated at 77–673 K. The decrease of the yield strength with increasing the temperature was mechanistically analyzed by considering contributions from various strengthening mechanisms. An anomalous dependence of strain hardening on temperature was observed and was justified to be caused by dynamic strain aging (DSA) as an extra strengthening mechanism at elevated temperatures. A model was constructed to split the overall strain hardening into forest hardening and DSA hardening, both of which were theoretically quantified at all temperatures considered.

Original language	English
Pages (from-to)	475-481
Number of pages	7
Journal	Materials Research Letters
Volume	7
Issue number	12
DOIs	https://doi.org/10.1080/21663831.2019.1658233
State	Published - 2019

Funding

We are grateful for the financial support of the National Science Foundation of US (DMR-1611180 and 1809640), the U.S. Army Research Office project (W911NF-13-1-0438 and W911NF-19-2-0049) with the program managers, Drs. G. Shiflet, D. Farkas, M. P. Bakas, S. N. Mathaudhu, and D. M. Stepp, in US, and theMinistry of Science and Technology (MOST 107-3017-F-007-003) in Taiwan. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

Keywords

Strain hardening
dislocation width
dynamic strain aging
serrated flow
temperature dependence

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10.1080/21663831.2019.1658233

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Chen, S. Y., Wang, L., Li, W. D., Tong, Y., Tseng, K. K., Tsai, C. W., Yeh, J. W., Ren, Y., Guo, W., Poplawsky, J. D., & Liaw, P. K. (2019). Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy. Materials Research Letters, 7(12), 475-481. https://doi.org/10.1080/21663831.2019.1658233

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title = "Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy",

abstract = "The temperature effect on the mechanical behavior of the HfNbTaTiZr high entropy alloy (HEA) was investigated at 77–673 K. The decrease of the yield strength with increasing the temperature was mechanistically analyzed by considering contributions from various strengthening mechanisms. An anomalous dependence of strain hardening on temperature was observed and was justified to be caused by dynamic strain aging (DSA) as an extra strengthening mechanism at elevated temperatures. A model was constructed to split the overall strain hardening into forest hardening and DSA hardening, both of which were theoretically quantified at all temperatures considered.",

keywords = "Strain hardening, dislocation width, dynamic strain aging, serrated flow, temperature dependence",

author = "Chen, {S. Y.} and L. Wang and Li, {W. D.} and Y. Tong and Tseng, {K. K.} and Tsai, {C. W.} and Yeh, {J. W.} and Y. Ren and W. Guo and Poplawsky, {J. D.} and Liaw, {P. K.}",

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year = "2019",

doi = "10.1080/21663831.2019.1658233",

language = "English",

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Chen, SY, Wang, L, Li, WD, Tong, Y, Tseng, KK, Tsai, CW, Yeh, JW, Ren, Y, Guo, W, Poplawsky, JD & Liaw, PK 2019, 'Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy', Materials Research Letters, vol. 7, no. 12, pp. 475-481. https://doi.org/10.1080/21663831.2019.1658233

TY - JOUR

T1 - Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy

AU - Chen, S. Y.

AU - Wang, L.

AU - Li, W. D.

AU - Tong, Y.

AU - Tseng, K. K.

AU - Tsai, C. W.

AU - Yeh, J. W.

AU - Ren, Y.

AU - Guo, W.

AU - Poplawsky, J. D.

AU - Liaw, P. K.

PY - 2019

Y1 - 2019

N2 - The temperature effect on the mechanical behavior of the HfNbTaTiZr high entropy alloy (HEA) was investigated at 77–673 K. The decrease of the yield strength with increasing the temperature was mechanistically analyzed by considering contributions from various strengthening mechanisms. An anomalous dependence of strain hardening on temperature was observed and was justified to be caused by dynamic strain aging (DSA) as an extra strengthening mechanism at elevated temperatures. A model was constructed to split the overall strain hardening into forest hardening and DSA hardening, both of which were theoretically quantified at all temperatures considered.

AB - The temperature effect on the mechanical behavior of the HfNbTaTiZr high entropy alloy (HEA) was investigated at 77–673 K. The decrease of the yield strength with increasing the temperature was mechanistically analyzed by considering contributions from various strengthening mechanisms. An anomalous dependence of strain hardening on temperature was observed and was justified to be caused by dynamic strain aging (DSA) as an extra strengthening mechanism at elevated temperatures. A model was constructed to split the overall strain hardening into forest hardening and DSA hardening, both of which were theoretically quantified at all temperatures considered.

KW - Strain hardening

KW - dislocation width

KW - dynamic strain aging

KW - serrated flow

KW - temperature dependence

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DO - 10.1080/21663831.2019.1658233

M3 - Article

AN - SCOPUS:85071516269

SN - 2166-3831

VL - 7

SP - 475

EP - 481

JO - Materials Research Letters

JF - Materials Research Letters

IS - 12

ER -

Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy

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