Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

Materials

Xu Li¹  Yanlin Jia²  Alex.A. Volinsky³  Kexing Song⁴  Baohong Tian⁴  Meng Zhou⁴  YiJie Ban⁴  Yong Liu⁴  Yi Zhang⁴ 

[1] Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China;College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620, USA;School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;

关键词: Cu-Ni-Co-Si-Cr-(Ce) alloys;    hot deformation;    microstructure evolution;    electron backscattered diffraction (EBSD);    processing map;   

DOI  :  10.3390/ma13143186

来源: DOAJ

【 摘 要 】

Cu-Ni-Si alloys are widely used in lead frames and vacuum devices due to their high electrical conductivity and strength. In this paper, a Cu-Ni-Co-Si-Cr-(Ce) alloy was prepared by vacuum induction melting. Hot compression tests of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were carried out using a Gleeble-1500 simulator at 500–900 °C deformation temperatures and 0.001–10 s⁻¹ strain rates. The texture change was analyzed by electron backscatter diffraction. The <110> fiber component dominated the texture after compression, and the texture intensity was reduced during recrystallization. Moreover, the average misorientation angle j for Cu-Ni-Co-Si-Cr-Ce (11°) was lower than that of Cu-Ni-Co-Si-Cr (16°) under the same conditions. Processing maps were developed to determine the optimal processing window. The microstructure and precipitates of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were also analyzed. The average grain size of the Cu-Ni-Co-Si-Cr-Ce alloy (48 μm) was finer than that of the Cu-Ni-Co-Si-Cr alloy (80 μm). The average size of precipitates in the Cu-Ni-Co-Si-Cr alloy was 73 nm, while that of the Cu-Ni-Co-Si-Cr-Ce alloy was 27 nm. The addition of Ce delayed the occurrence of dynamic recrystallization.

【 授权许可】

Unknown