In situ TEM investigation on void coalescence in metallic materials

摘要: Abstract More precise modeling on ductile fracture of metals at the scale from micron to meter is still urgently needed in many engineering applications. Due variety metal and its alloys, a lack understanding mechanisms quantitative experimental data impede building assessing mechanics models for different length scales. In this paper, situ tensile tests are carried out Transmission Electronic Microscope (TEM) copper, high entropy alloy aluminium alloy. We examine full process void growth coalescence neighboring voids under view TEM. Nanotwins ligament between lead new mechanism copper Necking shearing alloys clearly illustrated, which demonstrated by samples with manually drilled hole before SEM (Scanning Microscope). The evolution geometry recorded, then used verify existing literature. It found that McClintock model provides better prediction than Brown-Embury (including modified model). A multiscale homogenization framework experiments can be further extract stress state around voids, explaining importance stress-state cavitation/nucleation, voids.