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用X射线衍射仪、扫描电子显微镜、透射电子显微镜、显微硬度仪对经喷丸处理的Cu-0.8Cr-0.1Zr合金进行组织结构分析和硬化效果的测试,并在此基础上探讨了合金喷丸强化机制。结果表明,合金喷丸后在距表层300μm深度内形成了剧烈变形层和变形层两种不同变形程度的区域。其中剧烈变形层内位错密度较高,并形成位错胞亚结构和孪晶亚结构。随喷丸时间的增加,剧烈变形层晶粒尺寸可细化至80nm,表层HV硬度达到1.99GPa,较未变形试样提高1倍以上。合金的喷丸强化机制为细晶强化和应变硬化,而应变硬化的贡献大于细晶强化。
The microstructures and hardenability of the peening treated Cu-0.8Cr-0.1Zr alloy were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and microhardness tester. Based on the results, Shot peening mechanism. The results show that after shot peening, two regions with different deformities of deformed layer and deformed layer are formed in the depth of 300 μm from the surface. The dislocation density is high in the heavily deformed layer and forms dislocation cell sub-structure and twin-crystal sub-structure. With the increase of shot peening time, the grain size of the heavily deformed layer can be refined to 80nm, the HV hardness of the surface layer reaches 1.99GPa, which is more than double that of the undeformed specimen. The shot peening mechanism of alloy is fine grain strengthening and strain hardening, while strain hardening contributes more than fine grain strengthening.