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Study on the low mechanical anisotropy of extruded Mg-Zn-Mn-Ce-Ca alloy tube in the compression process

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Journal of Magnesium and Alloys 2024年第3期12卷 1054-1067页

作者： Dandan Li qichi le Xiong Zhou Xiaoqiang Li Chenglu Hu Ruizhen Guo Tong Wang Ping Wang Wenxin Hu The Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

In this study,the extruded Mg-Zn-Mn-Ce-Ca alloy tube with a low compression anisotropy along the ED,45ED and TD was *** effect of the second phases,initial texture and deformation behavior on this low mechanical anisotropy was *** results revealed that the alloy tube contains the high content(Mg1-xZnx)11Ce phase and the low content of Mg12Ce *** second phases are respectively incoherent and coherent with the Mg matrix,and their influence can be ***,the alloy tube exhibited a weak basal fiber texture,where the c-axis was aligned along the 0°∼30°tilt from TD to *** a texture made the initial deformation(at 1.0%∼1.6%strain)of the three samples controlled by comparable basal*** deformation progressed(1.6∼9.0%strain),larger amounts of ETWs nucleated and gradually approached saturation in the three samples,re-orienting the c-axis to a 0°∼±30°deviation with respect to the loading ***,the prismatic and pyramidalslips replaced the dominant deformation progressively until ***,the similar deformation mechanisms determined by the weak initial texture in the three samples contribute to the comparable strain hardening rates,resulting in the low compressive anisotropy of the alloy tube.

关键词： Mg alloy tube Low mechanical anisotropy Weak texture Deformation mechanism.

镁合金表面高温氧化膜CO_(2)矿化处理研究

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材料导报 2024年第16期38卷 222-227页

作者：程春龙陈正陈长玖柳力晨乐启炽中国矿业大学材料与物理学院江苏徐州221116 东北大学材料电磁过程研究教育部重点实验室沈阳110819

为改善镁合表面高温氧化膜性能,采用CO_(2)矿化技术对AZ80-0.38Nd(质量分数/%,下同)合金表面高温氧化膜进行了处理。对比考察了合金氧化膜CO_(2)矿化处理前后的微观形貌、结构及物相,并采用浸泡和电化学测试技术研究了膜层的腐蚀防护性... 详细信息

为改善镁合表面高温氧化膜性能,采用CO_(2)矿化技术对AZ80-0.38Nd(质量分数/%,下同)合金表面高温氧化膜进行了处理。对比考察了合金氧化膜CO_(2)矿化处理前后的微观形貌、结构及物相,并采用浸泡和电化学测试技术研究了膜层的腐蚀防护性能。结果表明,AZ80-0.38Nd合金表面高温氧化膜具有典型的裂纹与孔洞缺陷,CO_(2)矿化处理很好地修复了合金表面高温氧化膜缺陷,提高了氧化膜层的致密度,并在合金表面构筑由棒状MgCO_(3)·3H_(2)O和层片状4MgCO_(3)·Mg(OH)2·4H 2O组成的矿化膜。相比于氧化膜,矿化膜可将合金自腐蚀电位(E corr)由-1.41 V SCE提高至-1.33 V SCE,将合金自腐蚀电流密度(i corr)由1.62×10^(-4)A/cm^(2)减小至2.47×10^(-5)A/cm^(2)。此外,矿化膜还能将合金局部腐蚀转变为均匀腐蚀,呈现优异的腐蚀防护性能。

关键词：镁合金高温氧化二氧化碳矿化腐蚀防护

6061铝合金半连铸圆坯组织瞬态数值模拟研究

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兵器材料科学与工程 2024年第5期47卷 25-33页

作者：呼京龙乐启炽胡文鑫东北大学材料科学与工程学院辽宁沈阳110819 包头稀土研究院内蒙古包头014020

本文建立了6061铝合金半连铸过程传热模型和元胞自动机-有限元(CAFE)耦合模型,采用边界跟踪法模拟了瞬态条件下不同铸造工艺对凝固组织演变的影响。经试验验证,该模型可模拟6061铝合金半连铸的凝固组织。用其预测不同铸造温度、速度和... 详细信息

本文建立了6061铝合金半连铸过程传热模型和元胞自动机-有限元(CAFE)耦合模型,采用边界跟踪法模拟了瞬态条件下不同铸造工艺对凝固组织演变的影响。经试验验证,该模型可模拟6061铝合金半连铸的凝固组织。用其预测不同铸造温度、速度和传热系数下的凝固组织。结果表明:铸造温度升高,等轴区宽度从219.1 mm降至187.4 mm,柱状晶和等轴晶均粗化;铸造速度增加,液穴深度增大,等轴晶区的宽度由222.1 mm降至202.4 mm,柱状晶尺寸增大,等轴晶细化;传热系数增大,铸坯边部温度梯度增大,柱状晶粗化,但中心熔体冷却速度增大,对等轴晶有一定细化效果。用半连铸方法生产6061铝合金铸锭,适当降低铸造温度,增大铸造速度和冷却水量有利于形成细小的凝固组织。

关键词：边界追踪法凝固组织元胞自动机-有限元法 6061铝合金

Application of dynamic recrystallization model in AZ12 magnesium alloy rolling process

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Chinese Journal of Aeronautics 2023年第2期36卷 325-333页

作者： Yanxia NIU Yan shi Xuelin ZHAO qichi le Yixuan WANG Shuai REN Na WANG School of Automation Science and Electrical Beihang UniversityBeijing 100191China Department of Musculoskeletal Tumor Senior Department of OrthopedicsThe Fourth Medical Center of PLA General HospitalBeijing 10048China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

To deeply understand the dynamic recrystallization behavior of as-cast AZ12 magnesium alloy in deformation process,the uniaxial hot compression experiments were implemented through systematic isothermal compression *** true strain of thermal compression experiments was set to 50%with temperatures of 200,250,300,350,400℃and the strain rates of 0.001,0.01,0.1,1 s^(-1).The Dynamic Recrystallization(DRX)kinetic model of AZ12 magnesium alloy was established and the accuracy of this model was *** model is used to predict the volume fraction of the sheet obtained by rolling through different rolling passes under the condition of consistent total reduction(50%).And the predicted results are in good agreement with the experimental results.

关键词： AZ12 magnesium alloy Compression DRX model Microstructure Reduction Rolling

Heat transfer analysis of magnesium alloy plate during transport process

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Journal of Magnesium and Alloys 2019年第2期7卷 291-296页

作者： qichi le Weitao Jia Fangkun Ning Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Heavy Machinery Engineering Research Center Ministry of EducationTaiyuan University of Science and TechnologyTaiyuan 030024China

Temperature detection and tracking of AZ31B magnesium alloy plate during the air-cooling transport process were investigated and carried out under different thicknesses and initial *** results show that there exists a sudden temperature drop in the range of 1/4 of width distanced from the *** the plate is cooled by 25-56°C,the maximum inhomogeneous temperature distribution under all process conditions will appear in width *** the air-cooling transport process,the temperature control model for predicting the average temperature of the Mg plate after a predetermined time period can be established by modifying the Stefan-Boltzmann empirical *** model mainly depends on the plate specifications and air-cooling time.

关键词： AZ31B magnesium alloy Temperature detection Transport process Temperature control model

Crimp feasibility of AZ31 magnesium alloy wide plate at warm temperatures responding to asymmetry

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Journal of Magnesium and Alloys 2022年第3期10卷 862-876页

作者： Fangkun Ning qichi le Jiashi Yan Yonghui Jia Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The crimp feasibility of AZ31 Mg alloy wide plate responding to asymmetry and anisotropy at different temperatures was conducted by bending experiments and numerical *** the microstructural characteristic,mechanical properties,EBSD and FEM analysis,the results indicated that{10-12}twins and pyramidal(a)slip were dominated at the inner surface layer of the plate,while prismatic and pyramidal(a)slips were controlled at the outer layer when bending at 100℃,and their quantity decreased as the temperature elevation and vanished at 200℃.The flexural deflection increased gradually with the augment of flexural temperature,while the fracture stress weakened.A large number of twins nucleated and grew in the coarse grain,causing major distribution proportion of high angular grain boundaries(HAGBs)at the compression part,which could improve its flexural properties and affect subsequent strain contours,twins and recrystallization *** offset of the neutral layer declined from 1.4125 mm to 0.7261 mm with the temperature rising from 100℃to 250℃when bending,while it was concentrated on 0.0338-0.0481 mm when coiling,accounting for 0.26%-0.37%of the plate *** last,the reel diameter descended with increasing the temperature and coiling rate.

关键词： Plate coiling Flexural deflection Fracture stress Neutral layer Schmid factor.

Bauschinger-Like Effect of AZ31 Magnesium Alloy Wide Sheet During the Straightening Process

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Acta Metallurgica Sinica(English letters) 2021年第9期34卷 1255-1264页

作者： Fangkun Ning qichi le Yonghui Jia Liang Chen Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The Bauschinger-like effect, which showed up in the straightening process of the AZ31 magnesium alloy wide sheet, was investigated through the multi-pass discrete three-point bending–unloading–bending(BUB) experiments. The stress variable, anisotropy, and asymmetry of tension and compression on the straightening process were corresponding to the Bauschingerlike effect. The Bauschinger-like effect in the initial, intermediate, and end of the straightening process was dominated by the twinning, detwinning, and dislocation induced by pyramidal slip, respectively. Also, they were responsible for the transformation of the Bauschinger stress parameter(BSP) and Bauschinger energy parameter(BEP). Later, the anisotropic nonlinear kinematic hardening model(ANK model) to describe the Bauschinger-like effect was optimized and simplified.

关键词： Bauschinger-like eff ect Straightening Discrete experiments Anisotropic nonlinear kinematic hardening model(ANK model)

QUENCHING AND AGEING BEHAVIORS OF Mg-Li-Zn ALLOY

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中国有色金属学会会刊：英文版 1997年第3期7卷 41-45页

作者： le, qichi Gui, Jianzhong Liu, Hanwu Northeastern Univ Shenyang China

ＱＵＥＮＣＨＩＮＧＡＮＤＡＧＥＩＮＧＢＥＨＡＶＩＯＲＳＯＦＭｇＬｉＺｎＡＬＬＯＹ①ＬｅＱｉｃｈｉ，ＣｕｉＪｉａｎｚｈｏｎｇ，ＬｉｕＨａｎｗｕＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌＦｏｒｍｉｎｇ，ＳｃｈｏｌｏｆＭａｔｅ... 详细信息

ＱＵＥＮＣＨＩＮＧＡＮＤＡＧＥＩＮＧＢＥＨＡＶＩＯＲＳＯＦＭｇＬｉＺｎＡＬＬＯＹ①ＬｅＱｉｃｈｉ，ＣｕｉＪｉａｎｚｈｏｎｇ，ＬｉｕＨａｎｗｕＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌＦｏｒｍｉｎｇ，ＳｃｈｏｌｏｆＭａｔｅｒｉａｌａｎｄＭｅｔａｌｕｒｇｙ，...

关键词： Mg Li Zn quenching ageing

Structure and mechanical properties of AZ31 magnesium alloy billets by different hot-top semi-continuous casting technology

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Rare Metals 2011年第4期30卷 414-418页

作者： ZHANG Zhiqiang le qichi CUI Jianzhong The Key Laboratory of Electromagnetic Processing of Materials （Ministry of Education of China） Northeastern University Shenyang 110004 China

AZ31 alloy billets of 200 mm in diameter were produced by three different processes of conventional direct chill （DC） casting, low-frequency electromagnetic casting （LFEC） and low-frequency electromagnetic vibration casting （LFEVC）, respectively. The effect of LFEC and LFEVC on the microstructures, macmsegregation and mechanical properties of AZ31 alloy billets was investigated. In conventional DC casting, the AZ31 alloy billets exhibited coarse grains （about 370 μa） and severe segregation of A1 and Zn. In the presence of a solo low-frequency alternating magnetic field or a low-frequency electromagnetic vibration field applied during DC casting of Ф200 mm AZ31 billets, grains in the AZ31 alloy billets were effectively reffmed （about 210 μa） and the macrosegregation of A1 and Zn in the billets was greatly decreased. Furthermore, the tensile strength, fracture elongation and hardness of the as-cast AZ31 alloy billets were improved by the processes of LFEC and LFEVC relative to that cast by the process of conventional DC casting.

关键词： magnesium alloys electromagnetic field microstructure macrosegregation mechanical properties casting