外加载荷对2124合金微观组织和性能的影响  

Effect of Additional Load on the Performance and Microstructure of 2124 Alloy

作　　者：权力伟[1] 赵刚[1] 田妮[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2011年第4期512-515,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51001022);中央高校基本科研业务费专项资金资助项目(N090302003);辽宁省博士启动基金资助项目(20101034)

摘　　要：采用透射电镜、拉伸等实验研究了2124合金在190和170℃加载时效后的组织和性能的变化规律.结果表明,由于位错提供了足够的错配度,S相在各个方向上的取向和数量基本相同;外加载荷对Al-Cu-Mg合金中S相的择优取向没有较明显的影响,但其尺寸相对较小,外加载荷对GPB的尺寸和取向分布都没有影响;在190℃加载时效时S相的长大速率比在170℃要快;在相同时效条件下,大量析出较细的S相使施加载荷样品的屈服强度要高于未施加载荷的样品.Microstructure and performance were investigated on aged 2124 alloy at 190 and 170 ℃ with or without added load by means of TEM,tensile testing.Due to dislocations providing enough misfits for the nucleation of S phases,equivalent S phase distribution in various directions was obtained.Load did not significantly impact preferential orientation of the S phase.However,length of the S phase in aged samples with load was shorter than that without load.Load had no significant impact on preferential orientation and length of GPB.Growth rate of the S phase aged at 190 ℃ was faster than that at 170 ℃ with load.Because of a large amount of fine S phase precipitation,yield strength of the aged alloy with load was larger than that without load.

关 键 词：AL-CU-MG合金 择优取向 S相 变形 

分 类 号：TG146[一般工业技术—材料科学与工程]