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Enhanced Oxidation Resistance of Ultrafine-Grain Microstructure AlCoCrFeNi High Entropy Alloy.

作者信息

Garg Mayank, Grewal Harpreet S, Sharma Ram K, Arora Harpreet S

机构信息

Surface Science and Tribology Lab, Department of Mechanical Engineering, Shiv Nadar University, Greater Noida, Uttar Pradesh 201314, India.

Centre for Inter-Disciplinary Research and Innovation, University of Petroleum and Energy Studies, Bidholi Via-Prem Nagar, Dehradun, Uttarakhand 248007, India.

出版信息

ACS Omega. 2022 Apr 7;7(15):12589-12600. doi: 10.1021/acsomega.1c06014. eCollection 2022 Apr 19.

DOI:10.1021/acsomega.1c06014
PMID:35474797
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9026100/
Abstract

This work investigates the effect of ultrafine-grain microstructure on the oxidation behavior of AlCoCrFeNi high entropy alloy (HEA). The ultrafine-grain microstructure is obtained using stationary friction processing performed at two different rotational speeds, 400 and 1800 rpm, for 5 min duration. Processed samples demonstrate high depth of refinement (DOR) and ultrafine grain size (0.43-1 μm) at high rotational speeds along with significant phase transformations from BCC/B2 to FCC microstructure. Further, surface free energy of the ultrafine-grain microstructure is enhanced up to 35%. Oxidation kinetics of the ultrafine-grained sample is decelerated up to 12-48% in a temperature range of 850-1050 °C for a duration of 100 h. Chromia and alumina were the predominant oxides formed in almost all the samples oxidized at elevated temperature. In addition, spinel Co(Cr,Fe)O/Fe(Co,Cr)O formation is also detected in the unprocessed oxidized samples. Processed samples rich in grain boundaries (GBs) promote internal oxidation to form Al-rich inner oxides. The enhanced oxidation resistance of the processed samples is attributed to the microstructural refinement and homogenization resulting in the formation of protective chromia followed by Al-rich inner oxides.

摘要
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/536b7c19a297/ao1c06014_0012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/2176f3645953/ao1c06014_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/701b26909ba7/ao1c06014_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/f11f64540e2e/ao1c06014_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/ebb0d452f14d/ao1c06014_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/cc0d291cd5c4/ao1c06014_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/abd89fcfd287/ao1c06014_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/5d9e81f23bd9/ao1c06014_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/bc947aba9fbe/ao1c06014_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/59db4f3c25ce/ao1c06014_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/ed24acba4f78/ao1c06014_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/a17ddbd4e25b/ao1c06014_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/536b7c19a297/ao1c06014_0012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/2176f3645953/ao1c06014_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/701b26909ba7/ao1c06014_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/f11f64540e2e/ao1c06014_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/ebb0d452f14d/ao1c06014_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/cc0d291cd5c4/ao1c06014_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/abd89fcfd287/ao1c06014_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/5d9e81f23bd9/ao1c06014_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/bc947aba9fbe/ao1c06014_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/59db4f3c25ce/ao1c06014_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/ed24acba4f78/ao1c06014_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/a17ddbd4e25b/ao1c06014_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c47/9026100/536b7c19a297/ao1c06014_0012.jpg

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本文引用的文献

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High Tensile Ductility and Strength in Dual-phase Bimodal Steel through Stationary Friction Stir Processing.通过静态搅拌摩擦加工实现双相双峰钢的高拉伸延展性和强度。
Sci Rep. 2019 Feb 13;9(1):1972. doi: 10.1038/s41598-019-38707-3.