Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 31, Issue 10, Pages 1089-1097Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-018-0781-x
Keywords
Copper alloy; Cryogenic; Rolling; Aging precipitation; Synchrotron radiation; X-ray diffraction
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Funding
- National Key Research and Development Program of China [2017YFA0403803]
- National Natural Science Foundation of China [51525401, 51774065, 51690163, 51601028]
- Dalian Support Plan for Innovation of High-level Talents (Top and Leading Talents) [2015R013]
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The effect of cryorolling on the precipitation process of deformed Cu-Ni-Si alloys was investigated through in situ synchrotron X-ray diffraction technique. The results demonstrate that the precipitation process is significantly accelerated by cryorolling. Cryorolling produces higher dislocation density, which provides more heterogeneous nucleation sites for Ni2Si precipitates, hence promotes precipitation. In the early stage of aging, the enhanced nucleation of precipitates accelerates the depletion of supersaturation, and finer precipitates are obtained. In addition, recrystallization is promoted as a result of high stored energy in the cryorolled Cu-Ni-Si alloys, which facilitates the formation of discontinuous precipitation in the late stage of aging.
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