Sc对Al-8.5Zn-2.3Mg-2.4Cu合金组织与性能的影响  

Effect of Sc on Microstructure and Properties of Al-8.5Zn-2.3Mg-2.4Cu Alloy

作　　者：成义锐 孙小涵 贺永东[1] 赵亿坤[3] 杜玉峰 梁飞龙 CHENG Yirui;SUN Xiaohan;HE Yongdong;ZHAO Yikun;DU Yufeng;LIANG Feilong(College of Materials Science and Engineering,Xinjiang University,Urumqi 830046,Xinjiang,China;Shandong Energy Digital Technology Co.,Ltd.,Jinan 250000,Shandong,China;College of Physical Science and Technology,Xinjiang University,Urumqi 830046,Xinjiang,China;Xinjiang Nongliushi Aluminum Co.,Ltd.,Wujiaqu 831300,Xinjiang,China;Xinjiang Xiangrun New Materials Co.,Ltd.,Hami 839000,Xinjiang,China)

机构地区：[1]新疆大学材料科学与工程学院,新疆乌鲁木齐830046 [2]山东能源数字科技有限公司,山东济南250000 [3]新疆大学物理科学与技术学院,新疆乌鲁木齐830046 [4]新疆农六师铝业有限公司,新疆五家渠831300 [5]新疆湘润新材料股份有限公司,新疆哈密839000

出　　处：《矿冶工程》2024年第5期142-147,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51861033);新疆维吾尔自治区科技厅重点研发专项项目(2020B02007)。

摘　　要：研究了Sc对Al-8.5Zn-2.3Mg-2.4Cu合金组织与性能的影响。结果表明:Al-Zn-Mg-Cu铸态合金中添加Sc后,合金晶粒尺寸明显减小;Sc含量(质量分数)由0增加至0.4%时,合金晶粒尺寸由107.7μm减小至49.96μm,硬度由116.8HV增加至130.2HV。经大变形量热轧处理后进行470℃×1 h固溶处理发现,相较未添加Sc的合金,含Sc合金位错密度增大;添加0.4%Sc的合金再结晶率由92.4%降低至45.7%,合金的再结晶行为受到抑制。经120℃×24 h时效处理后,添加0.4%Sc的Al-Zn-Mg-Cu合金中观察到大量弥散分布的圆球状Al_(3)Sc粒子和短棒状η′(MgZn_(2))粒子,通过绘制与α(Al)共格或半共格的Al_(3)Sc-MgZn_(2)晶体结构模型,可推测出Al_(3)Sc粒子为η′(MgZn_(2))相提供异质形核位点,促进其形核,对合金时效析出强化有促进作用。The effect of Sc on the microstructure and properties of Al-8.5Zn-2.3Mg-2.4Cu alloy was investigated.It is found that an addition of Sc can make the as-cast Al-Zn-Mg-Cu alloy with obviously smaller grain.As the Sc content(mass fraction)increases from 0 to 0.4%,the grain size of alloy decreases from 107.7μm to 49.96μm and the hardness increases from 116.8HV to 130.2HV.After hot-rolling process with large deformation quantity followed by 1 hour of solution heat treatment at 470℃,the Sc-containing alloy has higher dislocation density compared to the alloy without Sc addition,and the alloy with an addition of 0.4%Sc has a recrystallization rate dropped from 92.4%to 45.7%due to inhibition of its recrystallization behavior.After 24 hours of aging treatment at 120℃,the Al-Zn-Mg-Cu alloy with an addition of 0.4%Sc can be observed to have a large amount of spherical Al_(3)Sc particles and short rod-likeη′(MgZn_(2))particles in dispersive distribution.Based on the plotted a crystal structure of Al_(3)Sc-MgZn_(2) with coherent or semi-coherent interface withα(Al),it can be deduced that the Al_(3)Sc particles provide heterogeneous nucleation sites forη′(MgZn_(2))phase to promote its nucleation,which can promote precipitation hardening of the alloy.

关 键 词：微合金化 钪 AL-ZN-MG-CU合金 再结晶 Al3Sc粒子 异质形核位点 析出强化 

分 类 号：TG146[一般工业技术—材料科学与工程]