摘要
双级过时效是优化工业化大尺寸7050铝合金锻件综合性能的有效手段。对7050铝合金锻件进行双级过时效处理,研究第二级时效时间对其组织与力学性能的影响。结果表明,随着第二级时效时间的延长,晶界处析出相逐渐粗化,并由连续分布转变为断续分布,合金的硬度、屈服强度和抗拉强度随之降低,伸长率与断裂韧性逐渐升高,并且拉伸及断裂韧性测试样品的断裂模式从沿晶断裂向韧窝型断裂转变。当第二级时效时间延长至一定程度时,合金力学性能趋于平稳。为通过双级过时效工艺调控7050铝合金锻件的综合力学性能提供了研究基础和理论指导。
Two-stage over-aging is an effective means to optimize the comprehensive properties of industrial large-sized 7050 aluminum alloy.Two-stage over-aging treatment was performed on 7050 aluminum alloy forgings to investigate the effect of the second stage aging time on their microstructure and mechanical properties.The results show that with the extension of the second aging time,the precipitates at the grain boundary gradually coarsens and changes from continuous distribution to intermittent distribution,the hardness,yield strength and tensile strength of the alloy decrease,the elongation and fracture toughness increase gradually,and the fracture mode of the tensile and fracture toughness test samples change from intergranular fracture to dimple fracture.When the second stage aging time is extended to a certain extent,the mechanical properties of the alloy tend to stabilize.This study provides a research foundation and theoretical guidance for regulating the comprehensive mechanical properties of 7050 aluminum alloy forgings using two-stage over-aging technology.
作者
何维维
范晓东
刘禹
侯娟
HE Weiwei;FAN Xiaodong;LIU Yu;HOU Juan(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering ResearchCenter of Advanced Aluminum Alloys and Applications,Beijing 100095,China;School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《有色金属材料与工程》
CAS
2023年第3期29-35,44,共8页
Nonferrous Metal Materials and Engineering
基金
国家自然科学基金资助项目(52073176)。
关键词
7050铝合金
双级过时效
显微组织
力学性能
7050 aluminum alloy
two-stage over-aging
microstructure
mechanical properties
