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Unique Duplex Microstructure and Porosity Effect on Mechanical Properties of AlCoCrFeNi_(2.1) Eutectic High-Entropy Alloys Processed by Selective Laser Melting

查看全文 作　　者：Liwei [1,2,3]Lan;Wenxian [1,2,3]Wang;Zeqin [1,2,3]Cui;Xiaohu [1,2]Hao 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan,030024,China;[2]Key Laboratory of Interface Science and Engineering in Advanced Materials,Taiyuan University of Technology,Ministry of Education,Taiyuan,030024,China;[3]Shanxi–Zhejiang University New Materials and Chemical Research Institute,Taiyuan,030032,China高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2023年第36卷第9期,共17页高影响力期刊 基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.52075360,and 52105389);the Primary Research and Development Plan of Shanxi Province(Grant No.202102050201009)。 摘　　要：Selective laser melting(SLM)was performed on AlCoCrFeNi_(2.1) eutectic high-entropy alloys(EHEAs),and the unique duplex microstructure and porosity were investigated as well as the negative effect on mechanical properties.SLM printed AlCoCrFeNi_(2.1) EHEAs is composed of face-centered cubic and BCC/B2 phases,and the surface texture of samples perpendicular to and parallel to the building direction is different.From the bottom of the molten pool to the inside,the structure changes from dendrites to columnar crystals and then to cellular crystals,the distribution of elements in and around the molten pool is uniform,and there is no element segregation.The surface hardness of as-printed AlCoCrFeNi_(2.1) EHEAs is higher than that of as-cast ones due to the grain refinement strengthening,and there is anisotropy in different surface hardness,the highest hardness is 580 HV(X–Y plane)and 560 HV(X–Z plane).The reduction of bearing area and tip stress concentration caused by pores have adverse effects on the tensile strength and elongation of the alloy,the ultimate tensile strength increased from 1060 to 1289 MPa. 关 键 词：Selective laser melting Eutectic high-entropy alloys Metallurgical porosity Microstructure evolution Grains and interfaces
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