Investigation of phases in Al23Co15Cr23Cu8Fe15Ni16 and Al8Co17Cr17Cu8Fe17Ni33 high entropy alloys and comparison with equilibrium phases predicted by Thermo-Calc
Investigation of phases in Al23Co15Cr23Cu8Fe15Ni16 and Al8Co17Cr17Cu8Fe17Ni33 high entropy alloys and comparison with equilibrium phases predicted by Thermo-Calc
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DOI：
10.1016/j.jallcom.2012.11.074
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发表时间：
2013-03-05
影响因子：
6.2
通讯作者：
Wanderka, N.
中科院分区：
文献类型：
--
作者：
Manzoni, A.;Daoud, H.;Wanderka, N.
用扫描电镜、透射电镜和三维原子探针对Al 23 Co 15 Cr23 Cu 8 Fe 15 Ni 16和Al 8 Co 17 Cr 17 Cu 8 Fe 17 Ni 33高熵合金进行了研究。虽然脆性的Al 23 Co 15 Cr23 Cu 8 Fe 15 Ni 16合金在凝固过程中主要分解成两个体心立方相，但韧性的Al 8 Co 17 Cr 17 Cu 8 Fe 17 Ni 33合金显示出两个突出的面心立方相。Al 23 Co 15 Cr23 Cu 8 Fe 15 Ni 16由富Fe-Cr和富Cu金属间化合物相嵌入富Al-Ni固溶体基体中组成。Al 8 Co 17 Cr 17 Cu 8 Fe 17 Ni 33合金的显微组织主要由两相组成。主要富集在Ni中的纳米尺寸的沉淀物嵌入在贫Al和Cu的基体中。在这两个高熵合金中观察到的相进行了比较与Thermo-Calc模拟预测的平衡相。(C)2012 Elsevier B. V.保留所有权利。
Al23Co15Cr23Cu8Fe15Ni16 and Al8Co17Cr17Cu8Fe17Ni33 high entropy alloys were investigated by scanning electron microscopy, transmission electron microscopy and three dimensional atom probe. While the brittle Al23Co15Cr23Cu8Fe15Ni16 alloy decomposes during solidification mainly into two body centred cubic phases, the ductile Al8Co17Cr17Cu8Fe17Ni33 shows two prominent face-centred cubic phases. Al23Co15Cr23Cu8Fe15Ni16 consists of Fe-Cr-rich and Cu-rich intermetallic phases embedded in an Al-Ni-rich solid solution matrix. The microstructure of Al8Co17Cr17Cu8Fe17Ni33 is mainly characterized by two phases. Nano-sized precipitates enriched mainly in Ni are embedded in a matrix depleted in Al and Cu. The phases observed in both high entropy alloys are compared with the equilibrium phases predicted by Thermo-Calc simulation. (C) 2012 Elsevier B.V. All rights reserved.