摘要
固溶温度影响晶粒尺寸小于10μm的薄板细晶2A97合金的强化机制,在固溶时间相同条件下,540℃固溶温度得到的2A97合金时效峰值抗拉强度比510℃的低40 MPa.为了解释这一现象,利用X射线衍射仪、扫描电子显微镜和透射电子显微镜等表征方法,分别从固溶强化、晶界强化、位错强化、析出强化等强化机制的角度,对固溶温度影响2A97合金强化机制的原因进行定量分析.研究发现,相对于510℃,固溶温度540℃时合金晶粒长大明显,回复再结晶程度高,位错密度降低,晶界无析出带变宽,这些影响导致合金性能下降.
The solid solution temperature affects the strengthening mechanism of thin-plate fine-grain 2A97 alloy with a grain size of less than 10μm.It has been observed that the tensile strength of peak-aging 2A97 alloy obtained at 540℃ decreases by 40 MPa compared with 510℃for the same solution time.X-ray diffraction,scanning electron microscopy,and transmission electron microscopy were applied to explain this phenomenon quantitatively from the perspective of strengthening mechanisms such as solid solution strengthening,grain boundary strengthening,dislocation strengthening and precipitation strengthening.It was found that the alloy solution-treated at 540℃exhibited significantly grown grains,higher levels of recovery and recrystallization,lower dislocation density and wider grain boundary precipitate free zone than that at 510℃,resulting in a decrease in the properties.
作者
牛凤姣
马子博
郭亚杰
刘海明
NIU Fengjiao;MA Zibo;GUO Yajie;LIU Haiming(Modern Engineering Training Center,Chang’an University,Xi’an 710061,China;College of Materials Science and Engineering,Chang’an University,Xi’an 710061,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第6期144-155,共12页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52101007)
中央高校基本科研业务费专项资金资助项目(300102501102)
陕西省重点研发计划一般项目(2021GY-211)。
关键词
铝合金
析出相
固溶温度
金相
位错
aluminum alloys
precipitation
solution temperature
metallography
dislocations
