7050铝合金表面亚微米化及其显微硬度的研究
Study on Surface Micro-crystallization of 7050 Al Alloy and Its Microhardness
杨祥伟1, 揭晓华1, 郑向新2, 黄展原2
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作者单位：(1. 广东工业大学 材料与能源学院, 广东 广州 510006; 2. 广东巨轮股份有限公司, 广东 揭阳 515500)
中文关键字：喷丸； 表面亚微米化； 7050铝合金； 显微硬度
英文关键字：shot peening; surface micro-crystallization; 7050 Al alloy; microhardness
中文摘要：通过改进7050铝合金表面纳米化技术(调节喷丸压力、弹丸直径和喷丸时间)在材料表面获得亚微米晶层，利用OM、XRD、SEM等方法对亚微米结构表层进行了观察和分析。结果表明：喷丸使7050铝合金表面发生一定的塑性变形，表层亚微米晶尺寸约88 nm，显微硬度比基体提高2倍。
英文摘要：The surface nano-crystallization of 7050 Al alloy was obtained using improved technology (including shot peening pressure, diameters of projectiles and shot peening time). The microstructure features of the surface layer were observed and analyzed using OM, XRD and SEM. The results show that after shot peening treatment, certain plastic deformation is found. The grain size of micro-crystallites on the surface layer is about 88 nm. The surface hardness rasies 2 times more than untreated samples.