Zr-4合金的表面晶粒细化研究

基金项目:

国家自然科学基金（50461001）、核材料与燃料国家级重点实验室基金（514810501）资助

Study on Surface Grain Refinement of Zircaloy-4

1. National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu, 610041, China;
2. School of Materials Science and Engineering, Chongqing University, Chongqing, 300044, China

摘要: 通过超声喷丸在Zr-4合金表面获得细晶组织,采用金相显微镜、X射线衍射(XRD)以及场发射扫描电镜(FEG-SEM)观察处理前后锆合金的晶粒组织变化。结果表明,喷丸后样品从表面到芯部依次为:纳米晶(厚度约为60μm)、超细晶(厚度约为160μm)和原始组织。喷丸处理的晶粒细化机制为剧烈塑性变形。主要过程包括:孪晶、位错萌生—位错纠缠—晶粒分割—取向随机化。
- 晶粒细化 /
- Zr-4合金 /
- 超声喷丸 /
- 剧烈塑性变形
Abstract: A refined structure was obtained on Zircaloy-4 through ultra-sonic shot peening （USSP） treat-ment and characterized by optical microscopy （OM）, X-ray diffraction （XRD） and field-emission gun scan-ning electron microscopy （FEG-SEM）. It has been found that the treated sample consists of three grain struc-tures: surface nanocrystalline （60μm thick）, ultrafine grain （160μm thick） and the matrix. The grain refine-ment mechanism is attributed to severe plastic deformation （SPD） during the USSP treatment, which includes: formation of twins and dislocations, formation of dislocation tangles, subdivision by dislocation cells, orientation randomization.
- Grain refinement /
- Zircaloy-4 /
- Ultra-sonic shot peening /
- Severe plastic deformation