摘要
通过对高温拉伸强度、延伸率、高温持久时间的测试以及SEM、TEM观察表明:Ag含量的增加显著提高合金在高温拉伸时的强度和高温持久强度极限;合金在高温下的断裂仍为塑性穿晶断裂;Ag含量越大,合金中析出的?相的数量越多,经长时间高温之后,其粗化程度不大,仍为主要强化相。
Effect of Ag content on the evaluated-temperature mechanical properties of a series of Al-Cu-Mg-Ag alloys was studied by means of tensile tests, endurance tests, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show that tensile strength and ultimate endurance strength increased dramatically with Ag content increasing. SEM observations suggest a plastic transgranular manner of tensile fractures. TEM results reveal that increasing Ag content promoted the nucleation of the Ω phase, which was the dominant strengthening phase in matrix. Furthermore, Ω precipitates were not coarsened on a large scale after long time endurance at evaluated temperature
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第3期482-485,共4页
Rare Metal Materials and Engineering
基金
国家重点基础研究发展计划资助项目(2005CB623705-04)
