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Title: Compositionally Graded High Entropy Alloy with a Strong front and ductile base

Abstract

Material components with variable properties can be ideal for many advanced applications due to their seamless nature of microstructural transition, cost reduction and high resistance of failure. A compositionally graded AlXCoCrFeNi (x=0.3-0.7) high entropy alloy composite build was additively manufactured using laser engineered net shaping (LENSTM). In this high throughput production process, the elemental composition of Al-Co-Cr-Fe-Ni powders in the hoppers were varied and the feed rates were shifted to create a laminate of Al0.3CoCrFeNi and Al0.7CoCrFeNi layers, with a 500 µm wide transition zone of intermediary composition. The energy-dispersive X-ray spectroscopy along the build direction verified the elemental composition matching closely with the targeted compositions. X-ray diffraction revealed the Al0.3CoCrFeNi to be a single-phase fcc structure whereas Al0.7CoCrFeNi had dual phase fcc + B2/ bcc. Scanning electron microscopy was used to capture the microstructural features in the two layers as well as the transition zone. The massive shift in mechanical properties of hardness, dynamic strength and work hardening rates in this graded composite have been discussed. With this endeavor, the microstructural complexity of HEAs has been combined with the unique advantage of LENSTM to achieve an ingenious path to fabricate materials suited applications demanding variable strength and ductility/toughness.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. BATTELLE (PACIFIC NW LAB)
  2. University of North Texas
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1709112
Report Number(s):
PNNL-SA-151530
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Materials Today Communications
Additional Journal Information:
Journal Volume: 20
Country of Publication:
United States
Language:
English

Citation Formats

Gwalani, Bharat, Gangireddy, Sindhura, Shukla, Shivakant, Yannetta, Christopher J., Valentin, Sheena, Mishra, Rajiv S., and Banerjee, Rajarshi. Compositionally Graded High Entropy Alloy with a Strong front and ductile base. United States: N. p., 2019. Web. doi:10.1016/j.mtcomm.2019.100602.
Gwalani, Bharat, Gangireddy, Sindhura, Shukla, Shivakant, Yannetta, Christopher J., Valentin, Sheena, Mishra, Rajiv S., & Banerjee, Rajarshi. Compositionally Graded High Entropy Alloy with a Strong front and ductile base. United States. https://doi.org/10.1016/j.mtcomm.2019.100602
Gwalani, Bharat, Gangireddy, Sindhura, Shukla, Shivakant, Yannetta, Christopher J., Valentin, Sheena, Mishra, Rajiv S., and Banerjee, Rajarshi. 2019. "Compositionally Graded High Entropy Alloy with a Strong front and ductile base". United States. https://doi.org/10.1016/j.mtcomm.2019.100602.
@article{osti_1709112,
title = {Compositionally Graded High Entropy Alloy with a Strong front and ductile base},
author = {Gwalani, Bharat and Gangireddy, Sindhura and Shukla, Shivakant and Yannetta, Christopher J. and Valentin, Sheena and Mishra, Rajiv S. and Banerjee, Rajarshi},
abstractNote = {Material components with variable properties can be ideal for many advanced applications due to their seamless nature of microstructural transition, cost reduction and high resistance of failure. A compositionally graded AlXCoCrFeNi (x=0.3-0.7) high entropy alloy composite build was additively manufactured using laser engineered net shaping (LENSTM). In this high throughput production process, the elemental composition of Al-Co-Cr-Fe-Ni powders in the hoppers were varied and the feed rates were shifted to create a laminate of Al0.3CoCrFeNi and Al0.7CoCrFeNi layers, with a 500 µm wide transition zone of intermediary composition. The energy-dispersive X-ray spectroscopy along the build direction verified the elemental composition matching closely with the targeted compositions. X-ray diffraction revealed the Al0.3CoCrFeNi to be a single-phase fcc structure whereas Al0.7CoCrFeNi had dual phase fcc + B2/ bcc. Scanning electron microscopy was used to capture the microstructural features in the two layers as well as the transition zone. The massive shift in mechanical properties of hardness, dynamic strength and work hardening rates in this graded composite have been discussed. With this endeavor, the microstructural complexity of HEAs has been combined with the unique advantage of LENSTM to achieve an ingenious path to fabricate materials suited applications demanding variable strength and ductility/toughness.},
doi = {10.1016/j.mtcomm.2019.100602},
url = {https://www.osti.gov/biblio/1709112}, journal = {Materials Today Communications},
number = ,
volume = 20,
place = {United States},
year = {2019},
month = {9}
}