Ultrasonic Cavitation Erosion Behavior of AlCoCrxCuFe High Entropy Alloy Coatings Synthesized by Laser Cladding

被引：12

作者：

Yin, Danqing ^{[1
]}

Liang, Guangbing ^{[1
]}

Fan, Shuai ^{[1
]}

Li, Shanxin ^{[1
]}

机构：

[1] Henan Univ Sci & Technol, Sch Mat Sci & Engn, Luoyang 471003, Peoples R China

来源：

MATERIALS | 2020年 / 13卷 / 18期

基金：

中国国家自然科学基金;

关键词：

ultrasonic cavitation erosion; high entropy alloy coatings; AlCoCrxCuFe; laser cladding; AUSTENITIC STAINLESS-STEEL; SOLID-SOLUTION PHASE; CORROSION BEHAVIOR; RESISTANCE; NI; TEMPERATURES; STABILITY;

D O I：

10.3390/ma13184067

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：

Cavitation corrosion resistant coatings are an excellent solution to the cavitation corrosion problem. High entropy alloys provide a new possibility for cavitation resistant coatings due to their excellent comprehensive performance. Laser cladding was employed to synthesize AlCoCrxCuFe (x represents the Cr concentration, x = 0.5, 1.0, 1.5, 2.0) high entropy alloy coatings (HECs) on AISI 304 steel. The phase transformation, microstructure, micro-mechanical properties, and cavitation erosion performance of HECs were studied. Results showed that AlCoCrxCuFe HECs were composed of BCC and FCC duplex phase. The microstructure of HECs showed a typical dendritic structure. The composition segregation of interdendrite structures was observed. Cavitation erosion resistance represented by 20 h volume loss was decreased with the increase in Cr content. AlCoCrxCuFe HECs with the lowest chromium content (AlCoCr0.5CuFe) showed the best cavitation erosion resistance among all samples. The cavitation resistance of AlCoCrxCuFe HECs has good correlation with the mechanical parameter H-n(3)/E-r(2) (H-n is nanohardness, Er is elastic modulus) and phase formation parameter delta (delta is atomic radius difference). The surface after 20 h of cavitation erosion testing exposed the dendritic structure of BCC phase, which was caused by the destruction of the interdendrite structure by cavitation impact.

引用

页数：14

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