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锰添加对CoCrFeNiPd高熵合金微观结构和力学性能的影响

Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy.

作者信息

Tan Yiming, Li Jinshan, Wang Jun, Kou Hongchao

机构信息

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.

出版信息

Entropy (Basel). 2019 Mar 16;21(3):288. doi: 10.3390/e21030288.

DOI:10.3390/e21030288
PMID:33267003
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7514768/
Abstract

CoCrFeNiPdMn ( = 0, 0.2, 0.4, 0.6, 0.8) high entropy alloys (HEAs) were prepared and characterized. With an increase in Mn addition, the microstructures changed from dendrites (CoCrFeNiPd with a single face-centered-cubic (FCC) phase) to divorced eutectics (CoCrFeNiPdMn and CoCrFeNiPdMn), to hypoeutectic microstructures (CoCrFeNiPdMn), and finally to seaweed eutectic dendrites (CoCrFeNiPdMn). The addition of Mn might change the interface energy anisotropy of both the FCC/liquid and MnPd-rich intermetallic compound/liquid interfaces, thus forming the seaweed eutectic dendrites. The hardness of the FCC phase was found to be highly related to the solute strengthening effect, the formation of nanotwins and the transition from CoCrFeNiPd-rich to CoCrFeNi-rich FCC phase. Hierarchical nanotwins were found in the MnPd-rich intermetallic compound and a decrease in either the spacing of primary twins or secondary twins led to an increase in hardness. The designing rules of EHEAs were discussed and the pseudo binary method was revised accordingly.

摘要

制备并表征了CoCrFeNiPdMn（=0、0.2、0.4、0.6、0.8）高熵合金（HEA）。随着锰添加量的增加，微观结构从树枝晶（具有单一面心立方（FCC）相的CoCrFeNiPd）转变为离异共晶（CoCrFeNiPdMn和CoCrFeNiPdMn），再到亚共晶微观结构（CoCrFeNiPdMn），最后转变为海藻状共晶树枝晶（CoCrFeNiPdMn）。锰的添加可能会改变FCC/液相和富MnPd金属间化合物/液相界面的界面能各向异性，从而形成海藻状共晶树枝晶。发现FCC相的硬度与溶质强化效应、纳米孪晶的形成以及从富CoCrFeNiPd到富CoCrFeNi的FCC相转变高度相关。在富MnPd金属间化合物中发现了分层纳米孪晶，初生孪晶或次生孪晶间距的减小都会导致硬度增加。讨论了等原子高熵合金的设计规则，并相应地修正了伪二元方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/f4f5ba42becd/entropy-21-00288-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/caecaaebd6c2/entropy-21-00288-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/f4d4fb3d6614/entropy-21-00288-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/a8985c75b10a/entropy-21-00288-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/e2f0a63c8026/entropy-21-00288-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/f00b030a9fd3/entropy-21-00288-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/caecaaebd6c2/entropy-21-00288-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bec2/7514768/f4f5ba42becd/entropy-21-00288-g010.jpg

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