Influence of Cryorolling on the Precipitation of Cu–Ni–Si Alloys: An In Situ X-ray Diffraction Study

作     者：Wei Wang Zong-Ning Chen En-Yu Guo Hui-Jun Kang Yi Liu Cun-Lei Zou Ren-Geng Li Guo-Mao Yin Tong-Min Wang 

作者机构：Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2018年第31卷第10期

页      面：1089-1097页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：the supports of National Key Research and Development Program of China(No.2017YFA0403803) the National Natural Science Foundation of China(Nos.51525401,51774065,51690163 and 51601028) the Dalian Support Plan for Innovation of High-level Talents(Top and Leading Talents,2015R013) 

主　　题：Copper alloy Cryogenic Rolling Aging precipitation Synchrotron radiation X-ray diffraction 

摘      要：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.