摘要
采用定向凝固技术制备了不同凝固速率的Cu-0.67Cr-0.3Zr合金。凝固速率在13.2~242μm/s时,合金为胞晶生长方式,且胞晶尺寸随凝固速率的增大而逐渐减小,在胞晶间的组织为共晶组织。在凝固速率为13.2、26μm/s的试样胞晶内部观察到微米级棒状BCC结构Cr相。另外,在试样的α-Cu基体中均观察到均匀分布的纳米级FCC结构Cr颗粒,且颗粒密度随凝固速率增大而升高。此外,随凝固速率增大,合金的硬度和屈服强度升高。
Cu-0.67Cr-0.3Zr alloy with different solidification rates were prepared by directional solidification technology. In the range of 13.2~242 μm/s, the alloy presents cellular growth, and the cell size is decreased gradually with the increase of solidification rate with the eutectic structure in intercellular region. At solidification rate of 13.2、26 μm/s, micron-size rod-like BCC Cr phase is observed inside the cellular, and nano-size FCC structural Cr particles with uniform distribution are observed in the α-Cu matrix, of which the density is increased with solidification rate increasing. Besides, the hardness and yield strength of the alloy are increased with the increase of solidification rate.
作者
刘德志
刘金刚
赵性川
马杰
王长征
黄宝旭
Liu Dezhi;Liu Jin'gang;Zhao Xingchuan;Ma Jie;Wang Changzheng;Huang Baoxu(School of Materials Science and Engineering,Liaocheng University;XPY(Liaocheng)Intelligent Technology Co.,Ltd.)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第1期62-67,共6页
Special Casting & Nonferrous Alloys
基金
山东省自然科学基金资助项目(ZR2018MEM005)。
关键词
定向凝固
CU-CR-ZR合金
组织
凝固速率
力学性能
Directional Solidification
Cu-Cr-Zr Alloy
Microstructure
Solidification Rate
Mechanical Properties
