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添加铝对粉末冶金制备的CoCrNi中熵合金微观结构及性能的影响

Effect of Al Addition on Microstructure and Properties of CoCrNi Medium-Entropy Alloy Prepared by Powder Metallurgy.

作者信息

Ding Xuekun, He Jichang, Zhong Jinde, Wang Xiang, Li Zhanjiang, Tian Jun, Dai Pinqiang

机构信息

College of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China.

Fujian Provincial Key Laboratory of Advanced Materials Processing and Application, Fuzhou 350118, China.

出版信息

Materials (Basel). 2022 Dec 19;15(24):9090. doi: 10.3390/ma15249090.

DOI:10.3390/ma15249090
PMID:36556895
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9787501/
Abstract

Powder metallurgy possesses the advantages of low energy consumption, less material consumption, uniform composition, and near-final forming. In order to improve the mechanical properties and high-temperature oxidation resistance of CoCrNi medium-entropy alloy (MEA), CoCrNiAl (X = 0, 0.1, 0.3, 0.5, 0.7) MEAs were prepared using mechanical alloying (MA) and spark-plasma sintering (SPS). The effect of aluminum content on the microstructure and properties of the MEAs was investigated. The results show that the CoCrNi MEA is composed of face center cubic (fcc) phase and some carbides (CrC). With the increase in Al content, there exists AlO precipitation. When the Al content is increased to Al and Al, the body center cubic (bcc) phase begins to precipitate. The addition of aluminum significantly enhances the properties of the alloys, especially those containing fcc+bcc dual-phase solid solutions. The yield strength, compressive strength, and hardness of CoCrNiAl alloy are as high as 2083 MPa, 2498 MPa, and 646 HV, respectively. The high-temperature resistance also reaches the oxidation resistance level. Different oxides include CrO, AlO, and (Co, Ni) CrO and NiCrO spinel oxides formed on the surface of alloys. The formation of an AlO oxidation film prevents the further erosion of the matrix by oxygen elements.

摘要

粉末冶金具有能耗低、材料消耗少、成分均匀和近终形成形等优点。为了提高CoCrNi中熵合金（MEA）的力学性能和高温抗氧化性能，采用机械合金化（MA）和放电等离子烧结（SPS）制备了CoCrNiAl（X = 0, 0.1, 0.3, 0.5, 0.7）中熵合金。研究了铝含量对中熵合金微观结构和性能的影响。结果表明，CoCrNi中熵合金由面心立方（fcc）相和一些碳化物（CrC）组成。随着铝含量的增加，会出现AlO析出。当铝含量增加到Al和Al时，体心立方（bcc）相开始析出。铝的添加显著提高了合金的性能，尤其是那些含有fcc+bcc双相固溶体的合金。CoCrNiAl合金的屈服强度、抗压强度和硬度分别高达2083 MPa、2498 MPa和646 HV。其高温抗性也达到了抗氧化水平。不同的氧化物包括CrO、AlO以及在合金表面形成的（Co, Ni）CrO和NiCrO尖晶石氧化物。AlO氧化膜的形成可防止基体受到氧元素的进一步侵蚀。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/e44342582721/materials-15-09090-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/08e035c3ac6b/materials-15-09090-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/1f4e039d2ee2/materials-15-09090-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/801352d158e7/materials-15-09090-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/abb85dc30dad/materials-15-09090-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/2146c4a018de/materials-15-09090-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/a7cf17917545/materials-15-09090-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/e44342582721/materials-15-09090-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/99b6a57677a8/materials-15-09090-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/20a21fe8ad08/materials-15-09090-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/c8f9f2b11505/materials-15-09090-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/29aa81974bd7/materials-15-09090-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/29de0de0bc96/materials-15-09090-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/02a847020c4e/materials-15-09090-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/08e035c3ac6b/materials-15-09090-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/1f4e039d2ee2/materials-15-09090-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/801352d158e7/materials-15-09090-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/abb85dc30dad/materials-15-09090-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/2146c4a018de/materials-15-09090-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/a7cf17917545/materials-15-09090-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b775/9787501/e44342582721/materials-15-09090-g014.jpg

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