摘要
本文使用内角为90°、外角为30°的模具对2A12铝合金进行了等径角挤压实验,并采用H itach iS-800透射电镜(TEM)研究了材料内部裂纹的产生和扩展。结果表明:挤压两次后的试样内部没有产生微裂纹,挤压三次后的试样中观察到了微裂纹的出现,而位错塞积是裂纹产生和扩展的主要因素。所以,2A12铝合金等径角挤压过程中,应该在两次挤压后进行退火处理,保证后续挤压的顺利进行。
Al-4. 25% Cu alloy was suffered from equal channel angular pressing （ECAP） in this experiment, in which an ECAP die with the inner angle Ф =90°, outer angle ψ =30°. It was studied that the cause and expansion of cracks of ECAPed Al-4.25% Cu alloy by TEM method. It shows that no cracks are found in samples after two passes ECAP, but they are observed in samples after three passes. And dislocation movement is the main cause of cracks expamsion. So ECAP samples should be annealed after two passes.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2006年第4期724-727,共4页
Journal of Synthetic Crystals
基金
国家自然科学基金(No.130170269)
山东省科技攻关项目(No.032050115)资助
