摘要
通过硬度和拉伸性能测试以及扫描电镜和透射电镜观察,研究了Al-4.5Cu-0.6Mg和Al-4.5Cu-0.6Mg-0.3Si合金在180℃下进行不同保温时间(6、10、14和18 h)的时效处理及元素Si对力学性能的影响。结果表明:随时效时间的延长,Al-4.5Cu-0.6Mg(-0.3Si)合金的硬度和强度先增大后减小,断裂伸长率明显降低;Si元素的添加使Al-4.5Cu-0.6Mg合金的硬度、强度、断裂伸长率均有明显提高,但延迟了Al-4.5Cu-0.6Mg合金达到峰时效的时间。利用SEM对Al-4.5Cu-0.6Mg(-0.3Si)合金拉伸断口形貌进行的观察表明:加入0.3%的Si元素后,Al-4.5Cu-0.6Mg合金的断裂特征由韧脆混合断裂变为韧性断裂。
The influences of aging time( 6、10、14 and 18 h) and Si addition on tensile properties of hot-extruded Al-4. 5Cu-0. 6Mg and Al-4. 5Cu-0. 6Mg-0. 3Si alloys were investigated by means of hardness and tensile tests as well as scanning and transmission electron microscope analysis. The results indicate that the hardness and tensile strength of Al-4. 5Cu-0. 6Mg(-0. 3Si) alloys firstly increase and then decrease with prolonging the aging time. And with the addition of 0. 3% Si,the elongation significantly decreases. The hardness,tensile strength and elongation of Al-4. 5Cu-0. 6Mg alloy increase,but the peak time to reach is delayed. The SEM observations on the tensile fracture reveal that after adding 0. 3% of Si element,the tensile fracture mode changes from a mixed ductile and brittle fracture into the ductile fracture for the Al-4. 5Cu-0. 6Mg alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第6期36-40,共5页
Transactions of Materials and Heat Treatment
基金
辽宁省教育厅科学技术研究一般项目(L2013056)
