Influence of fine-scale B2 precipitation on dynamic compression and wear properties in hypo-eutectic Al0.5CoCrFeNi high-entropy alloy

Journal Article · Sun Jan 31 23:00:00 EST 2021 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2020.157126· OSTI ID:1736015

Gwalani, Bharat ^[1]; Torgerson, Tyler ^[2]; Dasari, Sriswaroop ^[2]; Jagetia, Abhinav ^[2]; Nartu, MSKKY ^[2]; Gangireddy, Sindhura ^[2]; Pole, Mayur ^[2]; Wang, Tianhao ^[1]; Scharf, Thomas ^[2]; Banerjee, Rajarshi ^[2]

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1. BATTELLE (PACIFIC NW LAB)
2. University of North Texas

The near equiatomic high-entropy alloys based on Al, Co, Cr, Fe, Ni have provided a novel microstructural template for alloy design. The face-centered cubic (FCC) matrix strengthened by body-centered cubic (BCC) based ordered B2 precipitates can be used to develop a new generation of precipitation strengthened alloys. The present study focuses on an Al0.5CoCrFeNi hypo-eutectic alloy consisting of an as-solidified FCC+B2 microstructure. Guided by solution thermodynamic modeling, this alloy has been isothermally aged for solid-state precipitation of a high fraction of fine-scale intragranular B2 particles. The dynamic compressive strength, hardness, and sliding wear response of the alloy as a function of B2 phase fraction is examined. The flow stress at 0.02% true strain increased from ~ 670 MPa to ~1350 (102%) MPa, the ultimate compressive strength increased from ~1160 MPa to 1500 MPa (20%), and the wear resistance increased more than 5 times with progressively increasing phase fraction of B2 precipitates.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1736015
• Report Number(s): PNNL-SA-154016
• Journal Information: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 853
• Country of Publication: United States
• Language: English