锻压技术

Cu-Ni-Si合金连续挤压典型变形区的组织分析

英文标题：Microstructure analysis on typical deformation zone of alloy Cu-Ni-Si under continuous extrusion

关键词：Cu-Ni-Si合金连续挤压直角弯曲

分类号：TG376

出版年,卷(期):页码：2015,40(5):80-83

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 dissipatedly. And in the deformation zone after 90°bending, the precipitated phase particles grow up to 10 nm further, and the incomplete dynamic recrystallization appears whose formation mechanism is that dislocation accumulation and entanglement until merging and rearrangement lead to cellular sub structure formed.

基金项目：

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)

苏宏林（1961-），男，学士，副教授

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