Simplifying the microstructure and improving the corrosion resistance of the FeCoCrNiNbx high-entropy alloys via homogenizing annealing heat treatment

被引:0
作者
Liu, Chang [1 ,2 ]
Kong, Decheng [1 ,2 ]
Tan, Qingbiao [1 ,2 ]
He, Jian [1 ,2 ]
Wang, Rui [1 ,2 ]
Zhu, Guoliang [1 ,2 ]
Sun, Baode [1 ,2 ]
Zou, Yong [3 ]
机构
[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Adv High Temp Mat & Precis Formin, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[3] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China
基金
中国国家自然科学基金;
关键词
High-entropy alloy; Heat treatment; Microstructure; Corrosion resistance; MECHANICAL-PROPERTIES; COMPUTATIONAL THERMODYNAMICS; BEHAVIOR; NIOBIUM;
D O I
10.1016/j.jallcom.2025.178565
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
FeCoCrNiNbx high-entropy alloys were subjected to a homogenizing annealing heat treatment at 1200 degrees C for 4 h, which simplified the microstructure of the alloys and reduced the degree of compositional segregation. After heat treatment, FeCoCrNi alloy still maintained the single-phase FCC structure, and the grains grew into coarser columnar crystals reducing the number of grains; the intergranular eutectic FCC phase of FeCoCrNiNbx (x = 0.15, 0.33) alloys disappeared and the segregated Laves phase content in FeCoCrNiNbx (x = 0.15, 0.33, 0.5) alloys was significantly reduced. The special Ostwald ripening phenomenon was discovered in the FeCoCrNiNb0.5 alloy. The homogenizing heat treatment drastically raised the work function (WF) of the alloys by nearly a factor of one, improved the homogeneity of WF distribution in each phase, and weakened the tendency of selective dissolution; moreover, it also improved the compactness of the alloys' passive films, significantly decreased the maintaining passivation current density of the passive films by more than one order of magnitude, enhanced the tendency of the alloys repassivation, and ultimately improved the corrosion resistance of the alloys in 3.5 wt% NaCl solution. The thermodynamic calculation of alloy phase diagrams is of vital significance in guiding the design of alloy compositions, optimizing heat treatment processes, and improving alloy properties.
引用
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页数:17
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