摘要
借助扫描电镜以及能谱分析技术对预腐蚀LY12CZ铝合金疲劳断口形貌进行了研究,分析了腐蚀疲劳断口形貌与合金中的Si,Mg等元素以及腐蚀损伤对断裂过程的影响。结果表明疲劳断口是以韧性为主的多源性断口。腐蚀坑使得材料局部力学性能退化,成为裂纹萌生源。合金化过程中控制合适的Mg,Si等强化相元素含量,能够使强度与塑性相匹配,从而提高材料的抗疲劳性能。
Fatigue fracture surface of AA LY12CZ with corrosion damage was studied using scanning electron microscope and energy spectrum analysis.The effect of fatigue fracture feature,alloy element Si and Mg,and the corrosion damage on the fracture process was analyzed.The results indicated that the fatigue fracture surface is tough fracture with multiple fatigue sources;pits introduced by corrosion damage weaken the material property,which serve as crack nucleation sites;proper hardening constituent element introduced during alloying process such as Si and Mg,will make strength and plasticity match,thus improve fatigue performance of materials.
出处
《装备环境工程》
CAS
2013年第4期9-12,29,共5页
Equipment Environmental Engineering