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Zr-4合金的表面晶粒细化研究 被引量:7

Study on Surface Grain Refinement of Zircaloy-4
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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。 A refined structure was obtained on Zircaloy-4 through ultra-sonic shot peening (USSP) treatment and characterized by optical microscopy (OM), X-ray diffraction (XRD) and field-emission gun scanning electron microscopy (FEG-SEM). It has been found that the treated sample consists of three grain structures: surface nanocrystalline (60μm thick), ultrafine grain (160μm thick) and the matrix. The grain refinement mechanism is attributed to severe plastic deformation (SPD) during the USSP treaarment, which includes: formation of twins and dislocations, formation of dislocation tangles, subdivision by dislocation cells, orientation randomization.
出处 《核动力工程》 EI CAS CSCD 北大核心 2009年第1期64-67,共4页 Nuclear Power Engineering
基金 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
关键词 晶粒细化 ZR-4合金 超声喷丸 剧烈塑性变形 Grain refinement, Zircaloy-4, Ultra-sonic shot peening, Severe plastic deformation
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