摘要
采用ICP光谱仪、光学显微镜、电子万能试验机分析了205 mm厚度7055铝合金超厚板不同厚度层的化学成分、显微组织及力学性能的均匀性。分析结果表明:板材不同厚度层的化学成分均满足标准要求,主要合金元素Cu、Mg、Zn沿板材厚度方向的偏析率分别为7.3%、7.4%、5.8%;板材经过475℃6 h的固溶处理及110℃12 h+130℃24 h时效处理后,显微组织从表层至芯部,再结晶程度逐渐降低,板材在T/4厚度层取得最高的力学性能,其抗拉强度为626 N/mm^(2)、屈服强度为559 N/mm^(2),伸长率可以达到10.5%。
The chemical composition,microstructure and mechanical properties uniformity of 7055 aluminum alloy ultra-thick plate with 205 mm thickness were analyzed by ICP spectrometer,optical microscope and electronic universal testing machine.The results show that the chemical composition of different thickness layers of the plate meets the standard requirements,and the segregation rates of the main alloying elements Cu,Mg and Zn along the thickness direction of the plate are 7.3%,7.4%and 5.8%respectively.After solution treatment at 475℃for 6 h and aging treatment at 110℃for 12 h+130℃for 24 h,the degree of recrystallization gradually decreases from the surface layer to the core,and the plate achieves the highest mechanical properties in the T/4 thickness layer.The tensile strength is 626 N/mm^(2),the yield strength is 559 N/mm^(2),and the elongation can reach 10.5%.
作者
贾桂龙
陈愿情
韦修勋
何克准
谭自盟
JIA Gui-long;CHEN Yuan-qing;WEI xiu-xun;HE ke-zhun;TAN Zi-meng(Guangxi Alnan Aluminum Fabrication Co.,Ltd.,Nanning 530031,China)
出处
《轻合金加工技术》
CAS
2021年第6期40-46,共7页
Light Alloy Fabrication Technology
基金
广西创新驱动发展专项资金项目(桂科AA17204012,桂科AA17202007)。
关键词
7055铝合金
超厚板
化学成分
显微组织
力学性能
均匀性
7055 aluminum alloy
ultra thick plate
chemical composition
microstructure
mechanical properties
uniformity
