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中文摘要：
微观结构和 2519A 铝合金板的机械性质上的 Yb 内容的效果借助于张力的测试，光显微镜学，传播电子显微镜学，扫描电子显微镜学和 X 光检查衍射计被调查。结果显示出 Yb 增加的 0.17% 的那增加(集体部分) 密度“ 2519A 合金板和还原剂的粒子变粗的速度率”在 300 牣獯潣楰? 桰獡 ? 楦汥? 瑳摵 ? 的阶段湯愠楧杮戠桥癡潩 ? 景丠??? 娷 ? 愠汬祯
英文摘要：
The effects of Yb content on the microstructures and mechanical properties of 2519A aluminum alloy plate were investigated by means of tensile test,optical microscopy,transmission electron microscopy,scanning electron microscopy and X-ray diffractometer.The results show that addition of 0.17% （mass fraction） Yb increases the density of θ＇ particles of the 2519A alloy plate and reduces the coarsening speed rate of θ＇ phase at 300 ℃.Therefore,tensile strength is enhanced from 483.2 MPa to 501.0 MPa at room temperature and is improved from 139.5 MPa to 169.4 MPa at 300 ℃.The results also show that with the addition of 0.30% （mass fraction） Yb,the mechanical properties increase at 300 ℃ and decrease at room temperature.With Yb additions,the Al7.4Cu9.6Yb2 phase is found whilst the segregated phases of as-cast alloys along grain boundaries become discontinuous,thin and spheroidized.
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