摘要
将7136-0.35La合金进行一级、二级、三级固溶处理后均施以单级时效处理,通过扫描电镜、硬度计、万能拉伸试验机、电化学工作站等设备分别测试了合金的固溶态金相、拉伸断口形貌及能谱、合金硬度及断裂性能、电化学参数等。结果表明:三级固溶合金固溶态组织回溶效果较好,初步减少腐蚀裂纹源数量;三级固溶时效合金伸长率为13.65%,比单级固溶时效合金增长21.9%,且主断裂方式为韧性断裂;然而,单、双、三级固溶处理的3种时效态合金均表现出相似的耐电化学腐蚀性能,因此以腐蚀性能为主要指标时,首选单级固溶处理。
7136-0.35La aluminum alloy was subjected to solid solution treatment in single-,double-,and three-stage respectively and then single-stage aging,and the solid-solution metallography,tensile fracture morphology and energy spectra,alloy hardness,fracture properties,and electrochemical parameters were tested by scanning electron microscope,hardness tester,universal tensile tester,electrochemical workstation and other equipment.The results show that the re-dissolution effect for three-stage treated solid solution microstructure is better,and the number of corrosion cracking sources is preliminarily reduced.The elongation of the three-stage solution treated then aged alloy is 13.65%,which is 21.9%higher than that single-stage treated,and with ductile fracture as the primary fracture mode.However,the three aged alloys solid-solution treated in single-,double-and three-stages show similar resistance to electrochemical corrosion,so the single stage solution treatment is preferred when taking the corrosion property as the main criteria.
作者
王春华
王峰
王凤良
房洪杰
杨丽娟
Wang Chunhua;Wang Feng;Wang Fengliang;Fang Hongjie;Yang Lijuan(College of Materials Science and Engineering,Yantai Nanshan University,Yantai Shandong 265713,China;Longkou Nanshan Donghai Alumina Co.,Ltd.,Yantai Shandong 265706,China;College of Aeronautics,Yantai Nanshan University,Yantai Shandong 265713,China;College of Engineering,Yantai Nanshan University,Yantai Shandong 265713,China;Laboratory of Light Alloy Forming,Yantai Shandong 265713,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第9期124-128,共5页
Heat Treatment of Metals
基金
山东省高等学校科技计划(J18KB046)
山东省重点研发计划(2017GGX20130)。
关键词
多级固溶
固溶态组织
裂纹源
抗电化学腐蚀能力
multi-stage solid solution
solid-solution state structure
crack source
electrochemical corrosion resistance
