Ti和Ce对2524铝合金组织和力学性能的影响  

Effects of Ti and Ce content on microstructure and mechanical properties of 2524 aluminum alloy

作　　者：胡晓青[1] 房洪杰[1] 王艳娟[1] 孙杰[1] 尹登峰[2] 吕正风 Hu Xiaoqing;Fang Hongjie;Wang Yanjuan;Sun Jie;Yin Dengfeng;Lu Zhengfeng(College of Engineering, Yantai Nanshan University, Longkou Shandong 265713, China;School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China)

机构地区：[1]烟台南山学院工学院,山东龙口265713 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《金属热处理》2018年第6期41-45,共5页Heat Treatment of Metals

基　　金：山东省重点研发项目(2017GGX20130);国家十三五重点研发专项(2017YFB0306404);山东省高等学校科研计划项目(J16LA56)

摘　　要：利用光学显微镜、扫描电镜、拉伸试验机和透射电镜等手段研究了2524铝合金复合添加Ti元素和稀土元素Ce后的显微组织、拉伸断口形貌、力学性能以及析出相和位错。结果表明,复合添加Ti和Ce元素后,合金的铸态组织得到细化;合金板材的抗拉强度、规定塑性延伸强度、伸长率均有提高。热处理状态为T6时,分别提高了2.2%、2.9%、7.5%;热处理状态为T351时,则分别提高了1.5%、5.5%、20.9%。合金微合金化后,形成的第二相粒子能够阻碍位错攀移,起到抑制再结晶的作用。Microstructure,tensile fracture,mechanical properties,precipitates and dislocations of 2524 aluminum alloy added Ti element and rare earth element Ce were investigated by means of optical microscope,scanning electron microscope,tensile machine and transmission electron microscope. The results show that microstructure of as-cast alloy is refined after the addition of Ti and Ce elements,and the tensile strength,proof strength,plastic extension and elongation of the alloy sheet are improved. When the heat treatment state is T6,they are increased by 2. 2%,2. 9% and 7. 5%,respectively; when the heat treatment state is T351,they are increased by 1. 5%,5. 5% and 20. 9%,respectively. After microalloying,the second phase particles influence impeding the dislocation climbing and inhibiting the recrystallization.

关 键 词：微合金化 铝合金 复合添加 显微组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]