Solidification Microstructure of AlCoCrFeNi2.1 Eutectic High Entropy Alloy Ingots

被引：58

作者：

Nagase, Takeshi ^{[1
,2
]}

Takemura, Mamoru ^{[3
]}

Matsumuro, Mitsuaki ^{[3
]}

Maruyama, Toru ^{[4
]}

机构：

[1] Osaka Univ, Res Ctr Ultra High Voltage Electron Microscopy, Ibaraki 5670047, Japan

[2] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, Suita, Osaka 5650871, Japan

[3] Osaka Res Inst Ind Sci & Technol, Izumi 5941157, Japan

[4] Kansai Univ, Fac Chem Mat & Bioengn, Suita, Osaka 5648680, Japan

来源：

MATERIALS TRANSACTIONS | 2018年 / 59卷 / 02期

关键词：

metal; alloy; high-entropy alloy; microstructure; solidification; SOLID-SOLUTION; COOLING RATE; ELEMENTS;

D O I：

10.2320/matertrans.F-M2017851

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) ingots were successfully obtained by high-frequency melting and centrifugal metal-mold casting under an Ar flow. The microstructure of the ingots was investigated by trans-scale observations using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM). The constituent phases of the ingots were identified as fcc and bcc phases by X-ray diffraction (XRD) analysis, and were not dependent on the position of the ingot. The microstructure was observed to have a primary fcc dendrite and fcc+bcc eutectic structure at the inter-dendrite region, regardless of the position of the ingots. The size of the solidification structure was affected by the cooling rate. Faster cooling rates resulted in finer solidi flcation structures. TEM observations clarified the development of L1(2) ordering structures in the primary fcc dendrite phase, while the ordering peak could not be detected by XRD analysis.

引用

页码：255 / 264

页数：10

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