Effects of Yb addition on microstructures and mechanical properties of 2519A aluminum alloy plate

• Published in: Transactions of Nonferrous Metals Society of China 2010-05, Vol.20 (5), p.727-731
• Main Author: 张新明 王文韬 陈明安 高志国 贾寓真 叶凌英 郑大伟 刘玲 匡小月
• Format: Article
• Language: English
• Subjects: 2519A aluminum alloy; Alloy plating; Alloying additive; Aluminum base alloys; Density; Mechanical properties; Microstructure; rare-earth; Scanning electron microscopy; Spheroidizing; tensile properties; ytterbium; 力学性能; 微观结构; 扫描电子显微镜; 机械性能; 质量分数; 透射电子显微镜; 铝合金板
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60205-3

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.