Notch-tensile behavior of Al0.1CrFeCoNi high entropy alloy

Subhasis Sinha; Mageshwari Komarasamy; Tianhao Wang; Ravi Sankar Haridas; Priyanka Agrawal; Shivakant Shukla; Saket Thapliyal; Michael Frank; Rajiv S. Mishra

doi:10.1016/j.msea.2020.138918

Notch-tensile behavior of Al_0.1CrFeCoNi high entropy alloy

Subhasis Sinha, Mageshwari Komarasamy, Tianhao Wang, Ravi Sankar Haridas, Priyanka Agrawal, Shivakant Shukla, Saket Thapliyal, Michael Frank, Rajiv S. Mishra

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Notch-tensile behavior of an Al_0.1CrFeCoNi high entropy alloy (Al_0.1-HEA) was studied using V-notch geometry and with local strain mapping using digital image correlation (DIC). A notch-strength ratio of 1.51 indicated notch strengthening. Further analysis of stress-strain response supplemented with microstructural analysis revealed that, while the presence of notch results in strengthening due to work hardening by twinning induced plasticity, the notch also contributes strongly to geometrical softening in the non-uniform ductility regime, and accounts for the onset of failure. The strain localization behavior of Al_0.1-HEA due to the presence of V-notch was compared with three conventional alloys: Inconel 625 nickel-based superalloy, 304 stainless steel and Ti–6Al–4V titanium alloy. The study revealed that the nature of notch widening with increasing strain was dependent on material characteristics. The extent of notch widening impacted the local strain field and stress distribution, thereby influencing the propensity for crack initiation and growth. The experimental results were verified by finite element analysis.

Original language	English
Article number	138918
Journal	Materials Science and Engineering: A
Volume	774
DOIs	https://doi.org/10.1016/j.msea.2020.138918
State	Published - Feb 13 2020
Externally published	Yes

Funding

The work was performed under the cooperative agreement of University of North Texas with the Army Research Laboratory (W911NF-18-2-0067). Materials Research Facility at University of North Texas is acknowledged for allowing access to microscopy facilities. The authors thank Dr. Jeffrey T. Lloyd at the Army Research Laboratory for providing valuable insight during discussions.

Funders	Funder number
Army Research Laboratory	W911NF-18-2-0067

Keywords

Digital image correlation
Finite element analysis
High entropy alloy
Notch
Tensile deformation

Access to Document

10.1016/j.msea.2020.138918

Cite this

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title = "Notch-tensile behavior of Al0.1CrFeCoNi high entropy alloy",

abstract = "Notch-tensile behavior of an Al0.1CrFeCoNi high entropy alloy (Al0.1-HEA) was studied using V-notch geometry and with local strain mapping using digital image correlation (DIC). A notch-strength ratio of 1.51 indicated notch strengthening. Further analysis of stress-strain response supplemented with microstructural analysis revealed that, while the presence of notch results in strengthening due to work hardening by twinning induced plasticity, the notch also contributes strongly to geometrical softening in the non-uniform ductility regime, and accounts for the onset of failure. The strain localization behavior of Al0.1-HEA due to the presence of V-notch was compared with three conventional alloys: Inconel 625 nickel-based superalloy, 304 stainless steel and Ti–6Al–4V titanium alloy. The study revealed that the nature of notch widening with increasing strain was dependent on material characteristics. The extent of notch widening impacted the local strain field and stress distribution, thereby influencing the propensity for crack initiation and growth. The experimental results were verified by finite element analysis.",

keywords = "Digital image correlation, Finite element analysis, High entropy alloy, Notch, Tensile deformation",

author = "Subhasis Sinha and Mageshwari Komarasamy and Tianhao Wang and Haridas, {Ravi Sankar} and Priyanka Agrawal and Shivakant Shukla and Saket Thapliyal and Michael Frank and Mishra, {Rajiv S.}",

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doi = "10.1016/j.msea.2020.138918",

language = "English",

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T1 - Notch-tensile behavior of Al0.1CrFeCoNi high entropy alloy

AU - Sinha, Subhasis

AU - Komarasamy, Mageshwari

AU - Wang, Tianhao

AU - Haridas, Ravi Sankar

AU - Agrawal, Priyanka

AU - Shukla, Shivakant

AU - Thapliyal, Saket

AU - Frank, Michael

AU - Mishra, Rajiv S.

PY - 2020/2/13

Y1 - 2020/2/13

N2 - Notch-tensile behavior of an Al0.1CrFeCoNi high entropy alloy (Al0.1-HEA) was studied using V-notch geometry and with local strain mapping using digital image correlation (DIC). A notch-strength ratio of 1.51 indicated notch strengthening. Further analysis of stress-strain response supplemented with microstructural analysis revealed that, while the presence of notch results in strengthening due to work hardening by twinning induced plasticity, the notch also contributes strongly to geometrical softening in the non-uniform ductility regime, and accounts for the onset of failure. The strain localization behavior of Al0.1-HEA due to the presence of V-notch was compared with three conventional alloys: Inconel 625 nickel-based superalloy, 304 stainless steel and Ti–6Al–4V titanium alloy. The study revealed that the nature of notch widening with increasing strain was dependent on material characteristics. The extent of notch widening impacted the local strain field and stress distribution, thereby influencing the propensity for crack initiation and growth. The experimental results were verified by finite element analysis.

AB - Notch-tensile behavior of an Al0.1CrFeCoNi high entropy alloy (Al0.1-HEA) was studied using V-notch geometry and with local strain mapping using digital image correlation (DIC). A notch-strength ratio of 1.51 indicated notch strengthening. Further analysis of stress-strain response supplemented with microstructural analysis revealed that, while the presence of notch results in strengthening due to work hardening by twinning induced plasticity, the notch also contributes strongly to geometrical softening in the non-uniform ductility regime, and accounts for the onset of failure. The strain localization behavior of Al0.1-HEA due to the presence of V-notch was compared with three conventional alloys: Inconel 625 nickel-based superalloy, 304 stainless steel and Ti–6Al–4V titanium alloy. The study revealed that the nature of notch widening with increasing strain was dependent on material characteristics. The extent of notch widening impacted the local strain field and stress distribution, thereby influencing the propensity for crack initiation and growth. The experimental results were verified by finite element analysis.

KW - Digital image correlation

KW - Finite element analysis

KW - High entropy alloy

KW - Notch

KW - Tensile deformation

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