LY12CZ航空铝合金腐蚀疲劳断口研究  

Corrosion Fatigue Fracture Analysis of LY12CZ Aluminum Alloy

作　　者：李旭东[1] 穆志韬[1] 刘治国[1] 李玲[1] 

机构地区：[1]海军航空工程学院青岛校区,山东青岛266041

出　　处：《装备环境工程》2013年第4期9-12,29,共5页Equipment Environmental Engineering

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.

关 键 词：疲劳 铝合金 断口分析 扫描电子显微镜 

分 类 号：TG172.3[金属学及工艺—金属表面处理] TG174.34[金属学及工艺—金属学]