Experimental investigations of the micro cracking behavior of a coating-substrate structure were carried out in-situ with a scanning electron microscope (SEM). An anodized coating layer was deposited on an AZ91D substrate by the galvanize pulse method. Results indicated that the failure mechanism of the coating-substrate structure was due to a mismatch of micro deformation between the coating and substrate. The micro deformations induced by different failure models were cracking, spalling, or delamination. The failure models were validated using theoretical, experimental, and digital image correlation methods. The critical stress of failure can be evaluated by measuring the biaxial stress.

中文翻译：

---

使用SEM阳极氧化涂层AZ91D衬底的临界应力的评价 原位 技术

用扫描电子显微镜（SEM） 在原位 进行了涂层-基材结构的微裂纹行为的实验研究 。通过镀锌脉冲法将阳极氧化涂层沉积在AZ91D基板上。结果表明，涂​​层-基体结构的失效机理是由于涂层和基体之间的微观变形不匹配。由不同破坏模型引起的微变形是开裂，剥落或分层。使用理论，实验和数字图像相关方法验证了失效模型。破坏的临界应力可以通过测量双轴应力来评估。