Study on mechanism of environmental effect on interfacial fracture in micro-scale components

通过实验分析，阐明了气体环境对微尺度构件抗界面自由边裂纹萌生强度的影响。采用聚焦离子束技术制备了含界面的微元器件。具有精确加载装置的试样保持器在配备有环境单元的高压透射电子显微镜中操作。首次在气体环境中成功地进行了界面断裂过程的原位观察和断裂临界载荷的测定。但其环境效应机制尚需进一步系统研究。

Experimental analyses were performed to elucidate the effect of gaseous environment on the strength against crack initiation from interface free-edges in micro-scale components. The micro-components containing interfaces were fabricated with a focused ion beam technique. A specimen holder with a precise loading apparatus was operated in a high-voltage transmission electron microscope equipped with an environmental cell. The in-situ observation of interfacial fracture process, as well as the measurement of critical load at fracture, was successfully conducted for the first time in a gaseous environment. However, a systematic study needs to be further implemented to clarify the mechanism of environmental effect.