中文摘要：

对2524-T3铝合金母材及三种尺寸搅拌摩擦焊（FSW）对接接头的疲劳性能进行了研究，获得了各试样的sN曲线并进行了分析。结果表明：在疲劳寿命为1×10^5周时，小厚度、短焊缝FSW对接接头的疲劳强度约为母材的80．8％，大厚度FSW对接接头的疲劳强度约为小厚度、短焊缝FSW对接接头的80．3％，大焊缝FSW对接接头的疲劳强度约为小厚度、短焊缝FSW对接接头的79．9%。

英文摘要：

The fatigue performance of 2524-T3 aluminum alloy base metal and three kinds of size of friction stir welded （FSW）butt joints was studied. The S-N curves of samples were obtained and analyzed. The results show that when the fatigue life was 1 ×10^5 cycles, the fatigue strength of FSW butt joint with small thickness and short weld seam was 80. 8% of the fatigue strength of base metal, the fatigue strength of the joint with big thickness was 80. 3% of the joint with small thickness and short weld seam, and the fatigue strength of FSW butt joint with big weld seam was 79.9% of the joint with small thickness and short weld seam.