Effect of stress on microstructures of creep-aged 2524 alloy  

应力对蠕变时效2524合金微观组织的影响(英文)

作　　者：权力伟[1,2] 赵刚 田妮[1] 黄明丽[2] 

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,沈阳110004 [2]东北大学秦皇岛分校资源与材料学院,秦皇岛066004

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第8期2209-2214,共6页中国有色金属学报（英文版）

基　　金：Project (2009BAG12A07-B02) supported by the National Science & Technology Pillar Program during the 11th Five-Year Plan Period,China;Project supported by Innovative Research Team in University of Liaoning Province,China;Project (51001022) supported by the National Natural Science Foundation of China

摘　　要：Microstructures of creep-aged 2524 （A1-4.3Cu-1.5Mg） aged at 170 ℃ with various stresses （0, 173 and 250 MPa） were studied on a creep machine. Ageing hardness curves under various stresses were plotted and the corresponding microstructures were characterized by transmission electron microscopy （TEM）. The results show that the value of peak hardness is increased, while the time to reach the peak hardness is reduced under an external stress. Meanwhile, the length of S（Al2CuMg） phase is shorter and the number density of S phases is larger in the creep-aged alloy. The predominant contribution to the peak hardness can be ascribed to the GPB zones with an elastic stress.研究了2524合金(Al-4.3Cu-1.5Mg)通过蠕变机器施加不同应力(0、173和250 MPa)在170℃时效的微观组织变化,测定了不同应力下的硬度曲线,并利用透射电镜(TEM)观察相应的微观组织。结果表明:施加应力的样品,时效后其峰值硬度增加,而达到峰值硬度所需的时间缩短;时效成形后,S(Al2CuMg)相长度变短,而密度增加;弹性应力下GPB区对峰值硬度起主要作用。

关 键 词：creep-age S phase GPB zone hardness DISLOCATION stress orientation effect 

分 类 号：TG156.92[金属学及工艺—热处理]