力学性能和微观结构
(1. 北京航空航天大学 材料科学与工程学院，
北京 100083；
2. 东北大学 理学院， 沈阳 110004)
摘 要: 采用等通道角挤压法（ECAP法）制备亚微米7050铝合金。为了提高合金的力学性能，在挤压过程中增加了固溶时效处理工艺，并对7050铝合金在不同处理工艺条件下的显微组织和力学性能的变化进行了研究。结果表明：ECAP挤压后进行固溶和时效处理能明显提高合金的力学性能。退火态合金经过ECAP后，晶粒尺寸明显细化到亚微米级。将挤压一次的试样进行固溶处理和时效处理，合金的强度在575MPa左右，而延伸率能达到25.5%左右；若经等通道角挤压过的试样在固溶处理后立即进行再次挤压，并配合时效处理，合金强度能迅速达到616MPa，延伸率为16.9%。
关键字: ECAP； 7050铝合金； 固溶处理； 时效处理； 力学性能
submicrometer 7050 aluminum
alloy prepared by ECAP
（1. School of Materials Science & Engineering,
Beijing University of Aeronautics and Astronautics,
Beijing 100083, China;
2. College of Science, Northeastern University,
Shenyang 110004, China）
Abstract:Experiments were conducted to investigate the microstructure and mechanical properties of 7050 aluminum alloy processed by equal channel angular pressing (ECAP)combined with solid solution and aging treatment. It is shown that ECAP is capable of refining the grain size to submicrometer level rapidly; for the 7050 alloys solid solution treated and aged after ECAP (process 2), ultimate tensile strength σb increases to about 575MPa, elongation to failure δ increases to about 25.5%; if adding ECAP again immediately after solid solution treating (process 3), σb can reach about 616MPa, δ about 16.9%. So, the combination of heat treatment in the process of ECAP can obtain high strength and good ductility of 7050 alloys, which is very important for its prospect of application.
Key words: ECAP; 7050 aluminum alloy; solid solution treatment; aging; mechanical properties
