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Transactions of Nonferrous Metals Society of China 2020年第1期30卷 27-40页

作者： Xiao-feng WANG Tong-ya SHI He-bin WANG Song-ze ZHOU Wen-fei PENG Yong-gang WANG Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China School of Materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

The effects of strain rate on the mechanical properties,microstructure and texture of al-mg-si-cu alloy were investigated through tensile test,microstructure and texture *** results show that strain rate has some influences on the mechanical properties and microstructure,but a slight influence on the ***,yield strength,ultimate tensile strength and elongation increase first,then remain unchanged,and finally increase with increasing strain *** of strain rate,microstructure in the vicinities of the fracture regions of all the specimens is composed of the slightly elongated ***,some differences in misorientation angle distributions can be *** strain rate increases,the low angle grain boundaries(LAGBs)increase first,and then *** in the vicinities of the fracture regions are almost identical with increasing strain rate.

关键词： al-mg-si-cu alloy strain rate mechanical properties microstructure texture

Microstructure, Texture, and Hardness Evolutions of al-mg-si-cu alloy during Annealing Treatment

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Journal of Wuhan University of Technology(Materials Science) 2019年第6期34卷 1288-1296页

作者： WANG Xiaofeng MA cunqian MA Pengcheng ZHOU Songze WANG Yonggang Key Laboratory of Impact and Safety Engineering(Ningbo University) Ministry of EducationNingbo 315211China Capital Aerospace Machinery Company Beijing 100076China Aerospace Research Institute of Materials and Processing Technology Beijing 100076China

Microstructure, texture and hardness evolutions of al-mg-si-cu alloy during annealing treatment were studied by microstructure, texture and hardness characterization in the present study. The experimental results show that microstructure, texture and hardness will change to some extent with the increase of annealing temperature. The microstructure transforms from the elongated bands to elongated grains first, and then the grains grow continuously. The texture transforms from the initial deformation texture b fiber to recrystallization texture mainly consisting of cubeND {001} and P {011} orientations first, and then the recrystallization texture may be enhanced continuously as a result of the grain growth. Hardness decreases slowly at first, and then decreases sharply and increases significantly finally. Besides, the particle distributions also have great changes. As the annealing temperature increases, they increase firstly as a result of precipitation, and then gradually disappear as a result of dissolution. Finally, the effect of annealing temperature on microstructure, texture and hardness evolutions is discussed.

关键词： al-mg-si-cu alloy hardness microstructure texture recrystallization

Effect of artificial aging on the deformation behavior of an al-1.01mg-0.68si-1.78cu alloy

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Rare Metals 2008年第5期27卷 531-535页

作者： HE Lizi CHEN Yanbo ZHANG Haitao cuI Jianzhong Key Lab of the Ministry of Education of China for Electromagnetic Processing of Materials Northeastern University Shenyang 110004 China School of Materials ＆ Metallurgy Northeastern University Shenyang 110004 China

The influences of artificial aging on the microstructures and mechanical properties of an al-1.01mg-0.68si-1.78cu alloy were investigated. The detailed fracture surfaces, precipitates, and dislocation structures were also examined through scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show that the tensile strengths exhibit two peak values and reach saturated values with increasing aging time, while the elongation decreases sharply to the minimum value and changes slightly later. The deformation and fracture behaviors are also closely related to the aging conditions.

关键词： al-mg-si-cu alloy aging deformation precipitates dislocation fracture

Effects of Pre-Ageing Treatment on Subsequent Artificial Ageing Characteristics of an al-1.01mg-0.68si-1.78cu alloy

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Journal of Materials Science & Technology 2010年第2期26卷 141-145页

作者： Lizi He , Haitao Zhang and Jianzhong cui Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China Key Lab of Electromagnetic Processing of Materials Ministry of Education Northeastern University

The influences of pre-ageing temperature and natural ageing time on subsequent artificial age hardening behavior and precipitation sequence of new type al-1.01mg-0.O8si-l.78cu alloy were investigated by hardness test, differential scanning calorimetry （DSC） test and transmission electronic microscopy （TEM） observations. When pre-ageing temperature is 20℃ （natural ageing）, the peak hardness of subsequent artificial aged alloy is lower than that of T6 treated alloy （negative effect）, while a positive effect appears when pre-ageing temperature is above 80℃. The size of needlelike /3-precipitate in subsequent artificial aged alloy is much coarser when pre-ageing temperature is 20℃, which causes a decrease in peak-hardness. The positive effect occurs again when natural ageing time is longer than 3 weeks. There are seven exothermic peaks in DSC curve of as-quenched alloy, while the number and height of exothermic peak decrease with increasing pre-ageing temperature and natural ageing time.

关键词： al-mg-si-cu alloy Pre-ageing treatment Age hardening Differential scanning calorimetry (DSC) curve

Effect of minor Zr and Sc on microstructures and mechanical properties of al-mg-si-cu-Cr-V alloys

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Transactions of Nonferrous Metals Society of China 2013年第7期23卷 1882-1889页

作者：蒙毅赵志浩崔建忠东北大学材料电磁过程研究教育部重点实验室沈阳110819

The effects of minor contents of Zr and Sc on the microstructures and mechanical properties of al-mg-si-cu-Cr-V alloy were studied. The results show that the effects of minor Zr and Sc on the as-cast grain refinement in the ingots, the improvement in the strength of the as-extruded alloys and the restriction of high angle grain boundaries in the aged alloys can be sorted as al3Scal3 （Zr,Sc）al3Zr. None of them could stop the nucleation of recrystallization, but al3 （Zr,Sc） phase is a more effective inhibitor of dislocation movement compared to al3 Sc in the aged alloys. Compared with the mechanical properties of the aged alloy added only 0.15% Sc, the joint addition of Zr and Sc to the alloy leads to a very slight decrease in strength with even no cost of ductility. Taking both the production cost and the little bad influence on mechanical properties into consideration, an optimal content of Zr and Sc in the al-mg-si-cu-Cr-V alloy to substitute 0.15% Sc is 0.13% Zr＋0.03% Sc.

关键词： al-mg-si-cu alloy recrystallization microstructure mechanical property

Effect of copper on precipitation and baking hardening behavior of al-mg-si alloys

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2289-2294页

作者：刘璁慧张新明唐建国刘星兴陈亮中南大学材料科学与工程学院长沙410083

The effects of copper on the ageing precipitation behavior of as-quenched and pre-aged AA6016 aluminum alloy were studied by differential scanning calorimetry （DSC）, Vickers hardness measurement and transmission electronic microscopy （TEM）. The results indicate that the addition of copper facilitates the growth of clusters （GP I） to the critical size during pre-ageing. Therefore, the addition of copper accelerates the transition from GP I （pre-β＂） to GP II （β＂） during final artificial ageing, and finally results in the favorable paint-bake response. However, the one with the copper level of 0.3% does not show significant baking hardening response as expected. Pre-aging can also reduce the detrimental effect due to natural aging of copper-containing alloys.

关键词： al-mg-si-cu alloy baking hardening behavior cu contained precipitates