Aging precipitation and recrystallization in re-aged copper alloy
(1.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China2.School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China)
Abstract: Precipitation and recrystallization behavior of the re-aged Cu-Ag-Cr alloy were investigated. The precipitation occurring before the onset of recrystallization in the pre-aging process makes it possible to gain the efficient hardening in re-aging process and the re-aging strengthening effect with pre-aging at 440℃ for 8h is the most remarkable. Pre-aging at 440℃ for 8h, consequent 60% deformation, and re-aging at 350400℃ can be close to optimal aging treatment. In the re-aging process combined with cold deformation in the studied Cu-Ag-Cr alloy, the in-situ recrystallization can be observed to occur, the precipitates are coarsened or dissolved in the front of grain boundaries following a re-precipitation in the recrystallization area.
Key words: copper alloy； re-aging； precipitation； recrystallization