摘要
通过室温拉伸、疲劳裂纹扩展速率测试及透射电镜等实验手段,研究Mg含量对Al-Cu-Mg-Ag合金时效析出过程与力学性能的影响。结果表明:随着Mg含量的增加,合金的时效响应速率加快,而强度则先上升后下降,当Cu/Mg比为6时,合金强度最高;Mg含量的提高为主要析出相?相提供了更多的形核位置,使得合金基体中的析出相细小弥散,分布均匀;Cu/Mg比接近4的合金经165℃时效30min处理后,晶内析出大量的Cu-Mg原子团簇,疲劳性能最佳。
The effect of Mg content on the microstructure and mechanical properties of Al-Cu-Mg-Ag alloys was characterized by means of tensile test, fatigue crack growth test and transmission electron microscopy （TEM）. The results show that with the increase of Mg content, the aging response time is accelerated, whereas the strength increased at first and then decreased; when Cu/Mg ratio approached 6 the alloy had the highest strength. TEM results reveal that raising the Mg level increase promoted the nucleation of the Ω phase, and made the precipitations small and finely dispersed. In addition, after aging at 165℃for 30 min, the alloy with a Cu/Mg ratio close to 4 had the best fatigue crack growth resistance, which is attributed to the presence of Cu-Mg clusters in the matrix.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第A01期52-55,共4页
Rare Metal Materials and Engineering
基金
国家重点基础研究发展计划项目(2005CB623705-04)
