Microstructure and mechanical properties of FeCoCrNiMnAlx high-entropy alloys prepared by mechanical alloying and hot-pressed sintering
To improve the strength and hardness, Al-containing FeCoCrNiMn high-entropy alloys (HEAs) were fabricated by mechanical alloying (MA) and hot-pressed sintering. The effects of Al concentration on the microstructure and mechanical properties of the alloys were examined. It was found that the Al-conta...
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| Published in | Journal of alloys and compounds Vol. 775; pp. 742 - 751 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
15.02.2019
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| Abstract | To improve the strength and hardness, Al-containing FeCoCrNiMn high-entropy alloys (HEAs) were fabricated by mechanical alloying (MA) and hot-pressed sintering. The effects of Al concentration on the microstructure and mechanical properties of the alloys were examined. It was found that the Al-containing alloys consisted of the matrix fcc or fcc + bcc duplex solid solution phases and a small quantity of M7C3 + M23C6 (where M = Cr, Mn, Fe) carbides and Al2O3 phases. A high Al concentration induced bcc precipitates in the alloys, and with the increase of Al concentration, the crystalline structure of the matrix solid solution phase changed from fcc to bcc. The addition of Al obviously strengthened the alloys, especially the alloys that contained fcc + bcc duplex solid solution phases. For example, the yield strength, compressive strength and hardness of alloy FeCoCrNiMnAl0.7 reached as high as 2230 MPa, 2552 MPa and 622 HV, respectively. The high strength/hardness was attributed mainly to the finer grains and the bcc precipitation.
•The FeCoCrNiMnAlx high-entropy alloys were prepared by powder metallurgy.•The existing criteria cannot fully predict the crystal structure of the alloys.•The addition of Al obviously strengthened the alloys.•The high strength was attributed mainly to the finer grains and bcc precipitation. |
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| AbstractList | To improve the strength and hardness, Al-containing FeCoCrNiMn high-entropy alloys (HEAs) were fabricated by mechanical alloying (MA) and hot-pressed sintering. The effects of Al concentration on the microstructure and mechanical properties of the alloys were examined. It was found that the Al-containing alloys consisted of the matrix fcc or fcc + bcc duplex solid solution phases and a small quantity of M7C3 + M23C6 (where M = Cr, Mn, Fe) carbides and Al2O3 phases. A high Al concentration induced bcc precipitates in the alloys, and with the increase of Al concentration, the crystalline structure of the matrix solid solution phase changed from fcc to bcc. The addition of Al obviously strengthened the alloys, especially the alloys that contained fcc + bcc duplex solid solution phases. For example, the yield strength, compressive strength and hardness of alloy FeCoCrNiMnAl0.7 reached as high as 2230 MPa, 2552 MPa and 622 HV, respectively. The high strength/hardness was attributed mainly to the finer grains and the bcc precipitation.
•The FeCoCrNiMnAlx high-entropy alloys were prepared by powder metallurgy.•The existing criteria cannot fully predict the crystal structure of the alloys.•The addition of Al obviously strengthened the alloys.•The high strength was attributed mainly to the finer grains and bcc precipitation. |
| Author | Wang, Weiguo Liu, Xiaoqiang Tang, Qunhua Yan, Xiaohui Dai, Pinqiang Cheng, Hu |
| Author_xml | – sequence: 1 givenname: Hu surname: Cheng fullname: Cheng, Hu email: jxchenghu@126.com organization: School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou, 318000, China – sequence: 2 givenname: Xiaoqiang surname: Liu fullname: Liu, Xiaoqiang organization: School of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, China – sequence: 3 givenname: Qunhua surname: Tang fullname: Tang, Qunhua organization: School of Mechanical & Electrical Engineering, Putian University, Putian, 351100, China – sequence: 4 givenname: Weiguo surname: Wang fullname: Wang, Weiguo organization: School of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, China – sequence: 5 givenname: Xiaohui surname: Yan fullname: Yan, Xiaohui organization: State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics & Center for Molecular Imaging and Translational Medicine, School of Public Health, Xiamen University, Xiamen 361005, China – sequence: 6 givenname: Pinqiang surname: Dai fullname: Dai, Pinqiang email: pqdai@126.com organization: School of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, China |
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| Title | Microstructure and mechanical properties of FeCoCrNiMnAlx high-entropy alloys prepared by mechanical alloying and hot-pressed sintering |
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