Abstract In this work, the Metal-rich phase Chromium Aluminum (CrAl)/Ceramic phase Chromium Aluminum Nitride (CrAlN) multi-layer coatings were prepared by Arc Ion Plating (AIP). The micro-structure and phase composition of CrAl/CrAlN multi-layer coatings were characterized, and the microstructure, mechanical properties, residual stress and fracture toughness of the coating were emphatically analyzed. It has been found out that the residual stress of the multi-layer coating was only −0.932 ± 0.065 GPa, which was significantly lower than that of the mono-layer coating for −1.569 ± 0.093 GPa. At the same time, it was also found that the preferred growth orientation of the coating changed from a mono-layer (111) to a multi-layer (200) crystal plane. The hardness of the multi-layer (22.74 ± 0.57 GPa) is slightly lower than that of the mono-layer (24.92 ± 0.5 GPa), and the adhesion strength (46.2 ± 3.8 N) is obviously higher than that of the mono-layer (37.4 ± 2.4 N), and the fracture toughness is also higher (8.7 ± 0.8 MPa m1/2). In addition, the mechanism of crack initiation and propagation in stress-induced coatings was studied in detail on the basis of the structure of micro-nano CrAl/CrAlN multi-layer coatings.

中文翻译：

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显微组织对CrAl/CrAlN涂层断裂失效机理的影响

摘要 本工作采用电弧离子镀(AIP)制备富金属相铬铝(CrAl)/陶瓷相氮化铝铬(CrAlN)多层涂层。表征了CrAl/CrAlN多层涂层的显微组织和相组成，重点分析了涂层的显微组织、力学性能、残余应力和断裂韧性。发现多层涂层的残余应力仅为-0.932±0.065 GPa，明显低于单层涂层的-1.569±0.093 GPa。同时，还发现涂层的优选生长取向从单层（111）晶面变为多层（200）晶面。多层（22.74±0.57GPa）的硬度略低于单层（24. 92 ± 0.5 GPa)，粘合强度(46.2 ± 3.8 N)明显高于单层(37.4 ± 2.4 N)，断裂韧性也更高(8.7 ± 0.8 MPa m1/2)。此外，在微纳米CrAl/CrAlN多层涂层结构的基础上，详细研究了应力诱导涂层裂纹萌生和扩展的机理。