Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy

Priyanka Agrawal; Sanya Gupta; Shivakant Shukla; Saurabh S. Nene; Saket Thapliyal; Michael P. Toll; Rajiv S. Mishra

doi:10.1016/j.matdes.2022.110487

Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy

Priyanka Agrawal, Sanya Gupta, Shivakant Shukla, Saurabh S. Nene, Saket Thapliyal, Michael P. Toll, Rajiv S. Mishra

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

22 Scopus citations

Abstract

The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a γ-fcc phase stabilizer) to the ε-hcp dominated HEA. With the Cu addition, the tensile stress-strain curves exhibited improved ductility and a delay in TRIP effect, suggesting an increased stacking fault energy, along with improved strength and work hardening. Improved properties with Cu addition are credited to almost 100% stabilized γ-fcc phase, increased type and number of interfaces: Cu-rich precipitates, shorter faults, phase separation, and increased grain boundary fraction. The new alloy was then friction stir processed (FSPed) to further improve the properties. An advanced TRIP effect is observed with FSP as compared to as-cast alloy, attributed to increased ε-hcp fraction and finer grain size. Based on microscopic observations, the improved strength is due to finer grain size, increased dislocation density, low density of faults, whereas reduced ductility is reasoned to be due to dissolution of Cu-rich precipitates and increased width of modulations from phase separation.

Original language	English
Article number	110487
Journal	Materials and Design
Volume	215
DOIs	https://doi.org/10.1016/j.matdes.2022.110487
State	Published - Mar 2022
Externally published	Yes

Funding

The work was sponsored by the Army Research lab under the ARL Award # W911NF-19-2-0011. The authors thank Materials Research Facility (MRF) at the University of North Texas, Denton, Texas for the microscopy facilities. The work was sponsored by the Army Research lab under the ARL Award # W911NF-19-2-0011. The authors thank Materials Research Facility (MRF) at the University of North Texas, Denton, Texas for the microscopy facilities. The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

Funders	Funder number
Army Research Lab	W911NF-19-2-0011
Materials Research Facility
University of North Texas

Keywords

Friction stir processing
High entropy alloys
Phase separation
Stacking faults
Tensile properties
Transmission electron microscopy

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10.1016/j.matdes.2022.110487

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title = "Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy",

abstract = "The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a γ-fcc phase stabilizer) to the ε-hcp dominated HEA. With the Cu addition, the tensile stress-strain curves exhibited improved ductility and a delay in TRIP effect, suggesting an increased stacking fault energy, along with improved strength and work hardening. Improved properties with Cu addition are credited to almost 100% stabilized γ-fcc phase, increased type and number of interfaces: Cu-rich precipitates, shorter faults, phase separation, and increased grain boundary fraction. The new alloy was then friction stir processed (FSPed) to further improve the properties. An advanced TRIP effect is observed with FSP as compared to as-cast alloy, attributed to increased ε-hcp fraction and finer grain size. Based on microscopic observations, the improved strength is due to finer grain size, increased dislocation density, low density of faults, whereas reduced ductility is reasoned to be due to dissolution of Cu-rich precipitates and increased width of modulations from phase separation.",

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AU - Thapliyal, Saket

AU - Toll, Michael P.

AU - Mishra, Rajiv S.

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N2 - The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a γ-fcc phase stabilizer) to the ε-hcp dominated HEA. With the Cu addition, the tensile stress-strain curves exhibited improved ductility and a delay in TRIP effect, suggesting an increased stacking fault energy, along with improved strength and work hardening. Improved properties with Cu addition are credited to almost 100% stabilized γ-fcc phase, increased type and number of interfaces: Cu-rich precipitates, shorter faults, phase separation, and increased grain boundary fraction. The new alloy was then friction stir processed (FSPed) to further improve the properties. An advanced TRIP effect is observed with FSP as compared to as-cast alloy, attributed to increased ε-hcp fraction and finer grain size. Based on microscopic observations, the improved strength is due to finer grain size, increased dislocation density, low density of faults, whereas reduced ductility is reasoned to be due to dissolution of Cu-rich precipitates and increased width of modulations from phase separation.

AB - The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a γ-fcc phase stabilizer) to the ε-hcp dominated HEA. With the Cu addition, the tensile stress-strain curves exhibited improved ductility and a delay in TRIP effect, suggesting an increased stacking fault energy, along with improved strength and work hardening. Improved properties with Cu addition are credited to almost 100% stabilized γ-fcc phase, increased type and number of interfaces: Cu-rich precipitates, shorter faults, phase separation, and increased grain boundary fraction. The new alloy was then friction stir processed (FSPed) to further improve the properties. An advanced TRIP effect is observed with FSP as compared to as-cast alloy, attributed to increased ε-hcp fraction and finer grain size. Based on microscopic observations, the improved strength is due to finer grain size, increased dislocation density, low density of faults, whereas reduced ductility is reasoned to be due to dissolution of Cu-rich precipitates and increased width of modulations from phase separation.

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Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy

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