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Effects of Deformation Modes on Texture Evolution during Hot Working of al-zn-mg-cu-zr alloy

Journal of Wuhan University of Technology(Materials Science) 2016年第3期31卷 616-623页

作者：赵晓东 LU Ruilong LIN Jinbao 陈慧琴 School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Applied Science Taiyuan University of Science and TechnologyTaiyuan 030024China

Deformation modes have strong effects on deformation textures and subsequent annealing textures during hot working of metals. Micro-textures and macro-textures during hot axisymmetric and planar compressive deformation and subsequent annealing processes of al-zn-mg-cu-zr alloy were investigated by EBSD and XRD respectively. The EBSD testing indicated that for the axisymmetric compressive deformation, Brass along the a-fiber and Goss present in the sample deformed at 350 ~C, Rotated-cube was present and Brass transformed to Goss along a-fiber after annealing; Rotated-cube appeared only in the deformation at 420 ~C, which decreased and Brass appeared after annealing. For the planar compressive deformation, Rotated-cube and Brass aligned to a and fl fibers present in the deformation at 350 ~C, Rotated-cube texture transformed to Brass along the ct-fiber after annealing; Rotated-cube and Brass were present in the deformation at 420 ~C, and the Rotated-cube was enhanced and Brass transformed to Goss after annealing. Shearing textures dominated on the surface of the specimen. XRD testing showed that Rotated-cube and a few Goss dominated in the thickplates formed by upsetting and drawing, which transformed to cube after annealing; However, Brass and cube textures present in the thick-plates formed by rolling besides Rotated-cube and Goss textures, which remained in the plates after annealing.

关键词： al-zn-mg-cu-zr alloy deformation annealing textures

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Evolutions of diffusion activation energy and Zener–Hollomon parameter of ultra-high strength al-zn-mg-cu-zr alloy during hot compression

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Progress in Natural Science:Materials International 2018年第5期28卷 635-646页

作者： Yuanwei Sun Qinglin Pan Zhiqi Huang Weiyi Wang Xiangdong Wang Mengjia Li Jianping Lai School of Materials Science and Engineering Central South University Sanshui Fenglv aluminum Co. Ltd. School of Materials Science and Engineering Zhengzhou University

The changes of stress level for the ultra-high strength al-zn-mg-cu-zr alloy were described by constitutive equation with considering lattice diffusion of aluminum, zinc, magnesium and copper. Zener–Hollomon(Z)parameter expression based on the constitutive equation with considering lattice diffusion was used to reflect the changes of microstructure. The critical stress σcfor the initiation of dynamic recrystallization(DRX) was introduced to calculate the Z parameter. Steady-state dislocation density ρsatand critical dislocation density ρcfor the initiation of DRX decreased with the increase of deformation temperature. The dependence of diffusion activation energy Q on temperature and strain rate was given and the effects of deformation conditions on Q were discussed in detail. Microstructural evolution revealed that low angle boundaries(2–5°) created in the process of dynamic recovery(DRV) could convert into subgrain boundary, thus the original grains were divided into subgrains, and then subgrains transformed into DRX grains by the way of progressive rotation. When the Z value was high(ln Z > 30.9), DRV was the main softening mechanism. With the decrease of Z value, both of DRV and DRX played an important roles in softening effect, while with the further decrease of Z value(ln Z allization(CDRX) and discontinuous dynamic recrystallization(DDRX) operated together under the condition of lower Z value, but CDRX was confirmed as the dominant DRX mechanism.

关键词： al-zn-mg-cu-zr alloy Constitutive model Dislocation density Diffusion activation energy Zener–Hollomon parameter

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Influence of minor Sc additions on grain refinement and microstructure characteristics of a high zn-containing al-zn-mg-cu-zr alloy

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Journal of Central South University 2022年第3期29卷 780-794页

作者： WEN Kai LI Xi-wu XIONG Bai-qing LIU Hong-lei WANG Ying-jun LI Zhi-hui ZHANG Yong-an LI Ya-nan State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China Northeast Light alloy Co. Ltd.Harbin 150060China

In the present work, scandium elements with a series of contents(0.06 wt.%, 0.10 wt.%, 0.14 wt.%,0.17 wt.%, 0.20 wt.% and 0.25 wt.%) were added in a high zn-containing al-zn-mg-cu-zr alloy and the corresponding as-cast microstructure characteristics including grains and phases were thoroughly investigated. The results indicated that fine grain boundaries existed in these alloys and fine mgzn2phases discontinuously distributed on them. Besides,alznmgcu eutectic phases and Sc, zr-containing phases with flocculent morphology were observed. As scandium contents vary from 0.06 wt.% to 0.17 wt.%, the average grain size continuously decreased and its equiaxial characteristics were strengthened. Meanwhile, the content of alznmgcu eutectic phase showed a decrease trend. When scandium contents were 0.20 wt.% and 0.25 wt.%, no further enhancement on grain refinement was observed, so as to the reduction of alznmgcu eutectic phase content. Besides, Sc, zr-containing phases with blocky morphology were observed and the alloy with a scandium content of 0.25 wt.% possessed a larger amount of blocky Sc, zr-containing phase than the alloy with a scandium content of 0.20 wt.%. Grain refinement and reduction of alznmgcu eutectic phase content associated with scandium addition were discussed.

关键词： al-zn-mg-cu-zr alloy high zinc content microstructure Sc addition grain refinement phase evolution

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Microstructure of al-zn-mg-cu-zr-0.5Er alloy under as-cast and homogenization conditions

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Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1449-1454页

作者：王少华孟令刚杨守杰房灿峰郝海戴圣龙张兴国大连理工大学材料科学与工程学院大连116024 北京航空材料研究院北京100095

The billets of al-zn-mg-cu-zr and al-zn-mg-cu-zr-0.5Er alloys were prepared by semi-continuous direct chill casting （DCC）.The effects of trace Er on microstructure of al-zn-mg-cu-zr alloy under as-cast and homogenization conditions were *** results show that the grain morphology is large dendritic structure and the grain size increases obviously by the addition of 0.5% ***,most of Er element in the alloy segregates at grain boundary during solidification,resulting in ternary al8cu4Er *** homogenization,most of the mgzn2 phase at grain boundary has dissolved back to al matrix in the two *** the Er-containing alloy,the dissolution temperature of al8cu4Er phase is about 575 °***,the homogenization treatment cannot eliminate al8cu4Er phase validity.

关键词： al-zn-mg-cu-zr alloy Er al8cu4Er phase homogenization microstructure

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Microstructural evolution and fracture mechanism of a new alzn-mg-cu-zr alloy processed by equal-channel angular pressing

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Rare Metals 2022年第10期41卷 3546-3551页

作者： Hong-Li Liu Ping Li Ke-Min Xue Chen-Hao Qian Rui Hua School of Materials Science and Engineering Hefei University of TechnologyHefei230009China

Equal-channel angular pressing(ECAP) is considered to be one of the most effective processing procedures to produce ultrafine-grained(UFG) materials.A new AI-znmg-cu-zr alloy was subjected to ECAP experiment in Route B_(C)(i.e.,rotated 90° in the same sense between each pass).The effect of ECAP on the microstructural evolution and fracture mechanism of the alloy was analyzed by optical microscope(OM),X-ray diffraction(XRD),tensile test(at room temperature),and scanning electron microscope(SEM).The results show that the main strengthening phase of the alloy is mgzn_(2),whose content increases apparently after ECAP,the dislocation density increases by one order of magnitude,the hardness value of the 1 pass ECAPed sample increases by 53 %,the ultimate tensile strength(UTS)increases by 29 %,and the true strain increases by 15.4 %.But the further increase in the strength with the passes increasing would cost a slight drop in the true *** morphology of the tensile dimples is converted from elongated one to equiaxed one with a uniform distribution of size and depth after pressing.

关键词： al-zn-mg-cu-zr alloy Equal-channel angular pressing Microstructural evolution Crystallite size Mechanical properties Fracture mechanism

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Microstructures and constituents of super-high strength aluminum alloy ingots made through LFEC process

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China Foundry 2007年第4期4卷 280-283页

作者： WANG Shuang ZUO Yu-bo cuI Jian-zhong College of Software Northeastern University Shenyang 110004 China Keb Lab of EPM Northeastern University Shenyang 110004 China

Ingots of a new super-high strength al-zn-mg-cu-zr alloy were produced respectively by low frequency electromagnetic casting(LFEC)and by conventional direct chill(DC)casting *** and constituents of the ingots were *** results indicated that the LFEC process significantly refines microstructure and constituents of the alloy,and to some extent,decreases the area(or volume)fraction of constituents and eutectic structure precipitated at grain ***,no difference in the type of constituents was observed between LFEC and DC *** results also showed LFEC process can improve the as-cast mechanical properties.

关键词： al-zn-mg-cu-zr alloy low frequency electromagnetic field DC casting microstructure constituent

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