摘要
采用透射电镜对Cu-Ni-Si合金连续挤压过程中的典型变形区粘着区、直角弯曲前变形区及直角弯曲后变形区组织进行取样分析研究。结果表明:在粘着区阶段,Cu-Ni-Si只发生了晶粒的拉伸变形以及伴随而来的位错大量缠结,并无第二相析出;在直角弯曲前变形区,已出现极其细小、尺寸为5 nm左右的弥散第二相颗粒Ni2Si;在直角弯曲后变形区,析出相颗粒进一步的长大,尺寸达到10 nm左右,出现了不完全动态再结晶,其形成机理为:由位错累积、位错缠结直至位错合并、重排到胞状亚结构的形成。
The microstructures in typical deformation zones such as adhesion zone, before and after 90°bending zones during continuous extrusion of alloy Cu-Ni-Si were studied by sampling and analysis with TEM. The results indicate that, in the adhesion zone, the grain tensile deformation accompanied with a large number of dislocation entanglements occurs in Cu-Ni-Si alloy without the second precipitated phase. In the deformation zone before 90°bending, the second phase particles Ni2Si with extremely small size about 5 nm appear dissipat- edly. And in the deformation zone after 90°bending, the precipitated phase particles grow up to 10 nm further, and the incomplete dynam- ic recrystallization appears whose formation mechanism is that dislocation accumulation and entanglement until merging and rearrangement lead to cellular sub structure formed.
出处
《锻压技术》
CAS
CSCD
北大核心
2015年第5期80-83,共4页
Forging & Stamping Technology
基金
上海市教委创新项目(11YZ112)
上海市科委基础研究重点项目(10JC1411800)
上海市教育委员会重点学科建设项目(J50503)
