Microstructures and Mechanical Properties of Multi-component AlxCrFe2Ni2Mo0.2 High-Entropy Alloys
来源期刊：Acta Metallurgica Sinica2020年第8期
论文作者：Qiuxin Nie Hui Liang Dongxu Qiao Zhaoxin Qi Zhiqiang Cao
文章页码：1135 - 1144
摘 要：A series of AlxCrFe2 Ni2 Mo0.2 alloy consisting of FCC+BCC phases have been designed,and their as-cast microstructures and mechanical properties were also investigated with x ranging from 0.6 to 0.9.It was found that with the addition of Al element,the solidified structures changed from dendrite to columnar crystal then back to dendrite again.Moreover,the increased amount of BCC phase resulted in finer and more uniform microstructures of FCC [FeCrNi（Mo）] and BCC（Al-Ni）phases.Tensile yield strength and hardness of alloys showed a similar increasing trend as the volume fraction of BCC phase increased.Both strain hardening rate and strain hardening exponent were calculated to assess the tensile properties of the alloys.It was shown that A10.6CrFe2 Ni2 Mo0.2 exhibited the most excellent and comprehensive mechanical properties due to its high work hardening ability and stable strain hardening rate.The product of strength and elongation of Al0.6CrFe2 Ni2 Mo0.2reached up to 38.6 GPa%,which was higher than most of the reported as-cast high-entropy alloys.
Qiuxin Nie1，Hui Liang2，Dongxu Qiao1，Zhaoxin Qi2，Zhiqiang Cao2,3
1. Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology2. Key Laboratory of Solidifi cation Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology3. Ningbo Institute of Dalian University of Technology
摘 要：A series of AlxCrFe2 Ni2 Mo0.2 alloy consisting of FCC+BCC phases have been designed,and their as-cast microstructures and mechanical properties were also investigated with x ranging from 0.6 to 0.9.It was found that with the addition of Al element,the solidified structures changed from dendrite to columnar crystal then back to dendrite again.Moreover,the increased amount of BCC phase resulted in finer and more uniform microstructures of FCC [FeCrNi（Mo）] and BCC（Al-Ni）phases.Tensile yield strength and hardness of alloys showed a similar increasing trend as the volume fraction of BCC phase increased.Both strain hardening rate and strain hardening exponent were calculated to assess the tensile properties of the alloys.It was shown that A10.6CrFe2 Ni2 Mo0.2 exhibited the most excellent and comprehensive mechanical properties due to its high work hardening ability and stable strain hardening rate.The product of strength and elongation of Al0.6CrFe2 Ni2 Mo0.2reached up to 38.6 GPa%,which was higher than most of the reported as-cast high-entropy alloys.
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