Fracture In Polycrystalline Iridium Coating

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• 作者：Zhaofeng Chen ; Wangping Wu ; Liangbing Wang and Ying Zhang
• 关键词：fracture surface ; polycrystalline iridium ; grain boundary
• 刊名：International Journal of Fracture
• 出版年：2008
• 出版时间：October, 2008
• 年：2008
• 卷：153
• 期：2
• 页码：185-190
• 全文大小：239.8 KB

文摘

Iridium coating was prepared by the double glow plasma. The phase identification and the microstructure observation of the fracture surface of the coating were examined by X-ray diffraction and scanning electron microscopy, respectively. The deposition rate of the coating was up to 20¦Ìm/h. The iridium coating failed predominantly by grain boundary brittle fracture at room temperatures. Brittle intergranular fracture does not depend on grain size. Intergranular fracture in iridium coating has been considered to arise from low cohesive strength of the grain boundaries.