FeNiMnCuC0．2Alx高熵合金结构及性能研究

通过高频感应加热在真空下制备FeNiMnCuC0．2Alx（x=0、0．1、0．2、0．5mol）高熵合金，对固溶处理后的试样进行结构及性能研究。结果表明，FeNiMnCuC0．2Alx高熵合金具有简单的面心立方结构；添加少量Al（x=0．1、0．2mol）能细化FeNiMnCuC0．2Alx高熵合金晶粒，但x=0．5mol时，晶粒又变得粗大；初生树枝状晶富含Fe、Ni元素，Mn、Cu在枝晶间相内有所聚集，C、Al大体上均匀分布于两相中；x=0时，FeNiMnCuC0．2Alx高熵合金具有高的抗压强度（5218MPa），x=0．1mol时，舍金抗压强度（4037MPa）和压缩率（〉75％）均较佳，随Al添加量的继续增加，合金压缩性能有所下降，x=0．5mol时，合金表现为脆性断裂。

Preparation and properties of FeNiMnCuC0.2 Alx high-entropy alloy

The FeNiMnCuC0.2 Alx（x= 0, 0. 1, 0.2, 0.5 mol） high-entropy alloy were prepared by highfrequency induction melting under vacuum condition, and the ingots were processed by solid-solution treatment. According to X-ray diffraction results, the FeNiMnCuC0.2 Alx high-entropy alloy has simple fec structure. Compressive properties of the alloy were tested by WAW-3100 testing machine. It is found that the FeNiMnCuC0.2 high-entropy alloy has high compressive strength, which reaches 5 218 MPa. With the increase of Al content, the compressive strength of the alloy decreases, When x=0.1 mol,a good combination of compressive strength and plastic strain is obtained, which are 4 037 MPa and more than 75%, respectively. When the content of A1 reaches x=0.5 mol, the alloy exhibits brittle fracture. The results of microstructure and EDS show that the addition of a small amount of Al （x=0. 1, 0. 2 mol） can make FeNiMnCuC0.2 Alx grains finer; while x=0. 5 tool, primary dendrite grains grow. EDS finds dendritic segregation area to be Fe, Ni rich, while interdendritic segregation area is found to be Mn, Cu rich. The distribution of C, Al is almost identical.