Dear All,
We carry out fracture test of Zr alloys. To distinguish crack growth during fracture test, we carry out heat tinting at 300 oC for 20 min at no load and then samples are torn apart to measure fatigue pre-crack and final crack length. One such stereo fractograph is attached here. We almost always get bright region between crack growth during fracture test and post fracture tearing region. I want to whether it belongs to crack growth during fracture test or it is part of post fracture tearing?