周明哲,易丹青,蔡金伶,王宏伟,芦禹

• 1:中南大学材料科学与工程学院
• 2:中南大学教育部有色金属材料科学与工程重点实验室

摘要(Abstract)：

利用维氏硬度检测、疲劳性能测试、视差量热法(DSC)、透射电子显微分析(TEM)等手段,研究了航空用T3态2E12铝合金在150℃下分别暴露10 h,100 h,1000 h组织演变及疲劳寿命变化规律。结果表明:随热暴露时间的增加,合金硬度不断增大,疲劳寿命呈先增后降趋势;T3态及热暴露10 h合金中析出相由GPB区结构组成,热暴露10 h合金中GPB区发生长大,因而具有最长疲劳寿命;热暴露100 h至1000 h后,合金中析出相为S″相及S′相,析出相在晶界处析出,晶界附近形成无沉淀析出带(PFZ);由于S″相及S′相共格性较GPB区低,加之晶界处析出相易形成裂纹源,PFZ与基体协调性差等因素,热暴露100 h和1000 h后,合金疲劳寿命急剧下降。

关键词(KeyWords)： 2E12铝合金;热暴露;DSC分析;析出相;疲劳性能

Abstract:

Keywords:

基金项目(Foundation): 国家“973高性能铝材和铝资源高效利用基础研究”子课题(2005CB623705);; 中国铝业公司科技发展基金资助项目(CHALCO-2007-KJ-09)

作者(Author): 周明哲,易丹青,蔡金伶,王宏伟,芦禹

DOI: 10.13289/j.issn.1009-6264.2011.01.030

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