摘要
用差热分析、金相显微镜、扫描电镜、透射电镜、拉伸试验机等研究固溶温度对2519A-T87合金厚向性能及断裂行为的影响,建立2519A-T87铝合金板厚向拉伸的裂纹扩展模型。结果表明:固溶温度从510℃升至530℃,可溶性结晶相粒子逐渐回溶,合金板厚向强度和伸长率逐渐升高;固溶温度升至540℃时合金过烧,导致合金板厚向力学性能恶化。合金板沿厚向拉伸的断裂机制主要是沿晶断裂,导致合金板厚向伸长性能差的主要原因是未溶的结晶相和难溶的脆性相、垂直于载荷方向的纤维晶粒结构和晶界分布特性。
Effect of solution temperature on the fracture behavior and mechanical properties of 2519 A-T87 aluminum alloy along the thickness direction was investigated using differential thermal analysis,metallographic microscope,scanning electron microscope,transmission electron microscope,tensile tests and other experimental methods.The crack propagation model of 2519 A-T87 aluminum alloy thick plate in thick direction was established.The results show that the soluble particles gradually dissolve into the matrix and the strength and elongation of the thick plate gradually increase along thickness direction as the solution temperature increases from 510℃to 530℃.However,over burning occurs when the solution temperature rises to540℃,which causes the deterioration of mechanical properties of the alloy.The fracture mechanism of the thick plate along the thickness direction is mainly intergranular fracture.The main reasons for the poor tensile ductility of thick plate along the thick direction are the insoluble crystalline phase and the insoluble brittle phase,the fiber grain structure and grain boundary distribution characteristics perpendicular to the load direction.
作者
刘文辉
蒋碧娟
黄浩
朱必武
LIU Wenhui;JIANG Bijuan;HUANG Hao;ZHU Biwu(College of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Jianglu Electromechanical Group Co.,Ltd,Xiangtan 411100,China;College of Mechanical and Electrical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第4期18-23,共6页
Ordnance Material Science and Engineering
基金
国家自然科学基金(51875197,51905166)
湖南省自然科学基金(2020JJ6027)。
关键词
2519A铝合金
固溶温度
厚向
断裂行为
2519A aluminum alloy
solution temperature
thickness direction
fracture behavior
