Direct evidence of the stacking fault-mediated strain hardening phenomenon

M. Frank; S. S. Nene; Y. Chen; S. Thapliyal; S. Shukla; K. Liu; S. Sinha; T. Wang; M. J. Frost; K. An; R. S. Mishra

doi:10.1063/5.0062153

Direct evidence of the stacking fault-mediated strain hardening phenomenon

M. Frank, S. S. Nene, Y. Chen, S. Thapliyal, S. Shukla, K. Liu, S. Sinha, T. Wang, M. J. Frost, K. An, R. S. Mishra

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23 Scopus citations

Abstract

Strain hardening in metallic materials delays catastrophic failure at stresses beyond the yield strength by the formation of obstacles to dislocation motion during plastic deformation. Conventional measurement of the instantaneous strain hardening rate originates from load-displacement data acquired during uniaxial mechanical testing, rather than the evolution of obstacles. In order to resolve hardening from the perspective of the very obstacles that cause strengthening, we used an in situ neutron diffraction experimental approach to determine the strain hardening rate based upon real-time measurement of stacking fault interspacing during plastic deformation. Results provide clear evidence of the evolving contribution of obstacles during plastic deformation. The collapse of interspacing between multiple obstacle types enabled immense strain hardening in a Fe38.5Mn20Cr15Co20Si5Cu1.5 high entropy alloy leading to a true tensile strength of ∼1.7 GPa along with elongation of ∼35% at room temperature.

Original language	English
Article number	081906
Journal	Applied Physics Letters
Volume	119
Issue number	8
DOIs	https://doi.org/10.1063/5.0062153
State	Published - Aug 23 2021

Funding

The present work was performed under a cooperative agreement between the Army Research Laboratory (ARL) and the University of North Texas (No. W911NF-18-2-0067). The authors thank the Environmental and Molecular Science Laboratory (EMSL) for providing access to microscopy facilities at the Pacific Northwest National Laboratory (PNNL). Neutron diffraction experiments were carried out at the Spallation Neutron Source (SNS), which is a U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory (ORNL), sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences. M. Frank acknowledges financial support from the Department of Energy Office of Science Graduate Research (SCGSR) Program.

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Oak Ridge National Laboratory

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abstract = "Strain hardening in metallic materials delays catastrophic failure at stresses beyond the yield strength by the formation of obstacles to dislocation motion during plastic deformation. Conventional measurement of the instantaneous strain hardening rate originates from load-displacement data acquired during uniaxial mechanical testing, rather than the evolution of obstacles. In order to resolve hardening from the perspective of the very obstacles that cause strengthening, we used an in situ neutron diffraction experimental approach to determine the strain hardening rate based upon real-time measurement of stacking fault interspacing during plastic deformation. Results provide clear evidence of the evolving contribution of obstacles during plastic deformation. The collapse of interspacing between multiple obstacle types enabled immense strain hardening in a Fe38.5Mn20Cr15Co20Si5Cu1.5 high entropy alloy leading to a true tensile strength of ∼1.7 GPa along with elongation of ∼35% at room temperature.",

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AU - Frank, M.

AU - Nene, S. S.

AU - Chen, Y.

AU - Thapliyal, S.

AU - Shukla, S.

AU - Liu, K.

AU - Sinha, S.

AU - Wang, T.

AU - Frost, M. J.

AU - An, K.

AU - Mishra, R. S.

PY - 2021/8/23

Y1 - 2021/8/23

N2 - Strain hardening in metallic materials delays catastrophic failure at stresses beyond the yield strength by the formation of obstacles to dislocation motion during plastic deformation. Conventional measurement of the instantaneous strain hardening rate originates from load-displacement data acquired during uniaxial mechanical testing, rather than the evolution of obstacles. In order to resolve hardening from the perspective of the very obstacles that cause strengthening, we used an in situ neutron diffraction experimental approach to determine the strain hardening rate based upon real-time measurement of stacking fault interspacing during plastic deformation. Results provide clear evidence of the evolving contribution of obstacles during plastic deformation. The collapse of interspacing between multiple obstacle types enabled immense strain hardening in a Fe38.5Mn20Cr15Co20Si5Cu1.5 high entropy alloy leading to a true tensile strength of ∼1.7 GPa along with elongation of ∼35% at room temperature.

AB - Strain hardening in metallic materials delays catastrophic failure at stresses beyond the yield strength by the formation of obstacles to dislocation motion during plastic deformation. Conventional measurement of the instantaneous strain hardening rate originates from load-displacement data acquired during uniaxial mechanical testing, rather than the evolution of obstacles. In order to resolve hardening from the perspective of the very obstacles that cause strengthening, we used an in situ neutron diffraction experimental approach to determine the strain hardening rate based upon real-time measurement of stacking fault interspacing during plastic deformation. Results provide clear evidence of the evolving contribution of obstacles during plastic deformation. The collapse of interspacing between multiple obstacle types enabled immense strain hardening in a Fe38.5Mn20Cr15Co20Si5Cu1.5 high entropy alloy leading to a true tensile strength of ∼1.7 GPa along with elongation of ∼35% at room temperature.

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Direct evidence of the stacking fault-mediated strain hardening phenomenon

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