涂层厚度对镀铬锆合金界面结合力和力学性能的影响  

Effect of coating thickness on interfacial adhesion and mechanical properties of Cr-coated zircaloy

作　　者：周腾 陈寰 岳雅楠 方修洋 张瑞谦 高雄 蔡振兵[1] Teng ZHOU;Huan CHEN;Ya-nan YUE;Xiu-yang FANG;Rui-qian ZHANG;Xiong GAO;Zhen-bing CAI(Tribology Research Institute,Southwest Jiaotong University,Chengdu 610031,China;State Key Laboratory of Reactor Fuel and Materials,Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]西南交通大学摩擦学研究所,成都610031 [2]中国核动力科学研究院反应堆燃料与材料国家重点实验室,成都610041

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第9期2672-2686,共15页中国有色金属学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.U2067221)。

摘　　要：研究镀铬锆合金(Zr-4)的拉伸失效行为。通过对拉伸过程的实时观察,研究涂层厚度对界面附着力的影响。使用有限元分析和剪切强度理论定量评估Cr涂层的界面附着力。此外,还研究镀铬样品的裂纹扩展行为。结果表明,随着涂层厚度的增加,界面剪切强度和界面黏附性能下降。然而,对基材的保护作用随着涂层厚度的增加而增加。此外,涂层与基体界面处裂纹扩展的路径也随着涂层厚度的增加而变化。较薄涂层界面处的裂纹很容易扩展到基体中,造成局部损伤。较厚涂层的裂纹更容易沿界面扩展,导致黏合剂失效。The tensile failure behavior of the Cr-coated zircaloy(Zr-4)was investigated.The effect of the coating thickness on the interfacial adhesion of the samples was studied by observing the real-time process of tensile.The interfacial adhesion of the Cr coating was quantitatively evaluated using finite element analysis and shear strength theory.In addition,the crack propagation behavior of the Cr-coated samples was investigated.Results showed that the interfacial shear strength and the interfacial adhesion performance decreased with the increase of the coating thickness.However,the protective effect on the substrate increased with the increase of the coating thickness.Furthermore,the path of the crack propagation at the interface between the coating and the substrate also changed as the coating thickness increased.The cracks at the interface of the thinner coating expanded easily into the substrate,causing the local damage.The cracks of the thicker coating were more likely to propagate along the interface,resulting in the adhesive failure.

关 键 词：镀铬锆合金 涂层厚度 界面黏附 力学性能 拉伸失效 裂纹行为 

分 类 号：O346.1[理学—固体力学] TG174.4[理学—力学]