中文摘要：

为提高2060新型铝锂合金的抗疲劳性能,研究了喷丸强化对2060-T8E30铝锂合金表面完整性和疲劳性能的影响规律。利用表面轮廓仪、X射线应力测试仪、扫描电子显微镜（SEM）以及透射电子显微镜（TEM）等测试和分析了铝锂合金喷丸处理前后的表面完整性变化;使用高频疲劳试验机评价了喷丸强化处理对2060-T8E30铝锂合金疲劳寿命的影响规律;探讨了喷丸强化表面完整性与疲劳性能之间的内在联系。结果表明：合理强度的喷丸强化处理能够显著提高2060-T8E30铝锂合金的疲劳寿命,但过高或过低强度的喷丸处理不能达到改善铝锂合金抗疲劳性能的最佳效果,此归因于喷丸强化处理对铝锂合金表面完整性影响作用的非单调变化规律。

英文摘要：

In order to improve the fatigue resistance of 2060-T8E30 aluminum lithium alloy,the effect of the shot peening on the surface integrity and fatigue property of this alloy were investigated. The variations of the surface integrity before and after shot peening were observed and analyzed by using the surface profiler,X-ray stress instrument,scanning electron microscopy（ SEM） and transmission electron microscopy（ TEM）. The influence of the shot peening treatments on the fatigue life was studied by using the high frequency fatigue testing machine. The internal relationship between the surface integrity and the fatigue property were discussed. The results indicated that the shot peening with rational intensity can effectively improve the fatigue life of 2060-T8E30 alloy,however the best anti-fatigue performance of the aluminum lithium alloy can not be obtained by excessively increasing or decreasing the intensity of shot peening. It should be attributed to the non-monotonic influence of the shot peening on the surface integrity of aluminum lithium alloy.