Effect of cold rolling process on microstructure and properties of T1 Copper sheet

Abstract

The 8mm thick T1 state copper plate was cold rolled into 3mm, 2mm and 1mm thin plate sections, and its microstructure and texture were analyzed by optical metallographic microscope and X-ray diffraction (XRD). The mechanical properties were tested by cupping machine and micro-hardness tester. The results show that with the increase of cold rolling deformation, the grain size decreases and a strong (220) diffraction surface texture appears. The highest tensile strength is 421.76MPa, and the microhardness is 129.9HV, all of which are greatly improved, but the elongation decreases from 40% to 5%, and the fracture morphology changes from ductile fracture to quasi cleavage fracture.

Effects of work-hardening and post thermal-treatment on tensile behaviour of solder-affected copper

“…The present results do not fully agree with the general understanding that the microstructure of heavily rolled copper consists of long, thin, elongated cells with sharp boundaries; however, it agrees with the decrease of grain size along with crystal deformation as observed by Malin and Hatherly 50 and Sun and Li. 51…”

“…The present results do not fully agree with the general understanding that the microstructure of heavily rolled copper consists of long, thin, elongated cells with sharp boundaries; however, it agrees with the decrease of grain size along with crystal deformation as observed by Malin and Hatherly 50 and Sun and Li. 51 Figure 18 depicts the microstructural images of sample materials subjected to cold work and thermal ageing performed at 400°C. After thermal ageing at this higher temperature, the cold-rolled samples have availed a state of relaxation, and thus the micrographs have some grain reshaping indications.…”