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AZ31镁合金板材压弯–轧平复合形变组织性能研究
Study of Composite Deformation Properties of AZ31 Magnesium Alloy Sheet Bending-Rolling Flat  [PDF]
梁海成, 张玉鹏, 刘凤国, 崔海涛
Metallurgical Engineering (MEng) , 2022, DOI: 10.12677/MEng.2022.94034
Abstract: 为探究镁合金压弯轧平复合形变对其组织影响，通过构建宏观有限元模型，微观动态再结晶模型，对不同厚度的AZ31镁合金在400℃下多方向压弯–轧平复合形变进行模拟，并检测其织构变化情况。研究结果表明：等效应力随道次增加而增加，随板材厚度增加而减小，波峰应力值大于波谷处；随着变形道次增加再结晶现象更加明显，形变过程中出现孪晶，两道次孪晶比例上升。采用元胞自动机法(CA)，模拟AZ31镁合金复合形变中的微观组织变化，微观模拟结果与实验吻合。通过EBSD检测可知，复合形变能有效弱化板材基面织构。通过建立AZ31镁合金复合形变微观仿真模型，能够模拟仿真压弯轧平复合形变过程，对镁合金复合形变有一定指导作用。
In order to investigate the effect of bending-rolling composite deformation of magnesium alloy on its organization, by constructing macroscopic finite element model and microscopic dynamic recrystallization model, the multi-directional bending-rolling composite deformation of AZ31 magnesium alloy with different thicknesses was simulated at 400？C, and examined the change of its weave. The results show that: the equivalent stress increases with the number of passes and decreases with the thickness of the plate, and the peak stress value is larger than the trough; the recrystallization phenomenon is more obvious with the increase of deformation passes, and twinning occurs during the deformation process, and the proportion of twinning increases in two passes. The microstructure changes in the composite deformation of AZ31 magnesium alloy were simulated by the cellular automata method (CA), and the microscopic simulation results were consistent with the experiments. The composite deformation can effectively weaken the basal weave of the plate as shown by EBSD inspection. By establishing the microscopic simulation model of composite deformation of AZ31 magnesium alloy, it is able to simulate the process of composite deformation of press bending and rolling flat, which is a certain guidance for composite deformation of magnesium alloy.
In Vitro Corrosion and Bioactivity Study of Surface Phytic Acid Modified AZ31 Magnesium Alloy  [PDF]
Xu Yang, Lanlan Li, Jian He, Haiying Guo, Jiqiang Zhang
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.52009
Abstract:

The purpose of the present work was to examine in vitro corrosion and bioactivity of surface phytic acid treatment AZ31 magnesium alloys. Untreated AZ31 magnesium alloys were used as control. The surface morphologies of magnesium alloys were observed by SEM. EDS was used to analyze the surface chemical elemental compositions and elemental concentration distribution. Corrosion properties were evaluated by electrochemical tests. Human osteosarcoma MG-63 cells were used to examine cell viability and proliferation. The results showed that surface phytic acid treatment resulted in a surface coating formation, which did not significantly improve the corrosion resistance of the alloys. The corrosion potential of AZ31 magnesium alloy positive shifted only about 0.04 V (from -1.50 V to -1.46 V); and the corrosion current decreased only 0.354 mA/cm2 (from 2.547 × 10-3 mA/cm2 to 2.193 × 10-3 mA/cm

Investigation on the Mechanical Properties of Mg-Al Alloys (AZ41 and AZ51) and Its Composites
Khin S. Tun,Ng J. Minh,Quy B. Nguyen,Abdel Magid Hamouda,Manoj Gupta
Metals , 2012, DOI: 10.3390/met2030313
Abstract: In the present study, AZ41 and AZ51 alloys were fabricated using disintegrated melt deposition technique followed by hot extrusion. AZ41/Yttria and AZ51/Yttria composites were prepared using 0.6 wt% yttria nano particles in the alloys using the same fabrication technique. From the tensile test results, both strengths (yield and tensile) and ductility were improved in AZ51 when compared to AZ41. In comparison with its alloy counterparts, the yield and tensile strengths were enhanced while maintaining the same ductility in AZ41/Yttria composite, but comparable strengths with decreased ductility were observed in AZ51/Yttria composite. Under compressive loading, an improvement in strengths with similar ductility was observed in AZ51 when compared to AZ41. The best combination of strengths and ductility was observed in AZ51/Yttria composites from compression test results. The obtained mechanical properties are correlated with the microstructure observations.
Parameters optimization for friction spot welding of AZ31 magnesium alloy by Taguchi method
Campanelli, Leonardo Contri;Suhuddin, Uceu Fuad Hasan;Santos, Jorge Fernandez dos;Alcantara, Nelson Guedes de;
Soldagem & Inspe？？o , 2012, DOI: 10.1590/S0104-92242012000100005
Abstract: friction spot welding (fspw) is a solid state welding process suitable for producing spot-like joints, especially in lightweight materials, which are particularly interesting due to the weight saving potential. the plunging of an especially designed non-consumable and rotating tool creates a connection between overlapped sheets through frictional heat and plastic deformation. minimum material loss is observed, and therefore a fully consolidated joint with flat surface (no keyhole) is obtained. in the current study, the effect of fspw parameters, such as rotational speed, plunge depth and dwell time, on lap shear strength of az31 magnesium alloy joints was investigated. the optimization of input process parameters was carried out through taguchi approach of doe. analysis of variance was applied to determine the individual importance of each parameter. main effect plots were used to indicate the best levels for maximizing lap shear strength. the results show that tool plunge depth has the higher effect on the weld strength, followed by rotational speed and dwell time.
Cavitation Behavior during Superplastic Deformation of AZ31 Magnesium Alloy
Kaifeng ZHANG,Deliang YIN,Guofeng WANG,Wenbo HAN,
Kaifeng ZHANG,Deliang YIN,Guofeng WANG and Wenbo HAN School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,China
材料科学技术学报 , 2005,
Abstract: Superplasticity of AZ31 Mg alloy at the temperature range of 250～450℃ and stain rate range of 0.7x10-3～ 1.4x 10-1 s-1 was examined through uniaxial tensile test. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to investigate the morphology of cavities and surface relief near fracture surface, respectively.It is shown that AZ31 Mg alloy starts to exhibit superplasticity from 300℃. The maximum elongation of 362.5%was obtained at 400℃ and strain rate of 0.7×10-3 s-1. There exist many O-shaped cavities and filaments at the boundaries near fracture surface. The fracture of filaments results in intergranular cavity and the model for the formation of intergranular cavities is proposed. The growth of cavities is plasticity-controlled and the serrated boundaries of intergranular cavities agree with the results of surface relieves.
Corrosion resistance of AZ31 alloy after plastic working in NaCl solutions
W. Walke,J. Przondziono,E. Hadasik,J. Szala
Journal of Achievements in Materials and Manufacturing Engineering , 2011,
Abstract: Purpose: The purpose of the study was to assess corrosion resistance of magnesium alloy AZ31 (Mg-Al-Zn alloy) after plastic working in NaCl solutions. It presents currently applied methods of magnesium alloys plastic working. Basic groups of magnesium alloys that are used for plastic working have been discussed.Design/methodology/approach: Corrosion tests of AZ31 alloy were carried out in solution with concentration of 0.01-2 M NaCl with application of the system for electrochemical tests VoltaLab PGP201. Resistance to electrochemical corrosion was evaluated on the ground of registered anodic polarisation curves by means of potentiodynamic method. Immersion tests were carried out in NaCl solutions in the time of 1-5 days. Scanning microscopy enabled to present microstructure of AZ31 after immersion tests.Findings: Results of all carried out tests explicitly prove deterioration of corrosion properties of magnesium alloy AZ31 with the increase in molar concentration of NaCl solution.Practical implications: It was determined that irrespective of molar concentration of NaCl solution pitting corrosion was found in the tested alloy. It proves that application of protective coating on elements made of the tested alloy is necessary.Originality/value: Literature gives the results of corrosion tests with reference to cast alloy AZ31. Tests of corrosion resistance of hot rolled AZ31 in chloride solutions have been made for the first time.
Isothermal Gas Forming of Mg Alloy AZ31 Sheet
Yung-Hung Chen,Shyong Lee,Jian-Yih Wang,
Yung－Hung,Jian－YihWang
材料科学技术学报 , 2002,
Abstract: There have been reports on sheet forming of Mg alloy in industry via the punch and die method; this paper is probably the first formal one for studying the sheet formability of AZ31 employing pressurized gas to press the sheet into a female die cavity at various elevated temperatures. The results indicate it is feasible to form a rectangular box via pressurized gas from extruded sheets of 0.5 and 1.7 mm thick. The formed box has 1:2 depth over width ratio, which should be large enough when dealing with realistic industrial sheet forming parts. Presently, forming a sheet of 0.5 mm thick is considered a technical challenge by industry, and it is conquered as demonstrated in this paper. Gas forming technique applied to Mg alloy is unprecedented and shows potential for industrial utilization.
New Technique of Casting-rolling Strips for Semi-solid Magnesium Alloys
Shuisheng XIE,Maopeng GENG,Xinmin ZHOU,Ying ZHANG,Songyang ZHANG,Yanchun WANG,Guojie HUANG,
Shuisheng XIE,Maopeng GENG,Xinmin ZHOU,Ying ZHANG,Songyang ZHANG,Yanchun WANG and Guojie HUANG State Key Laboratory for Fabrication & Processing of Non-ferrous Metals,General Research Institute for Non-ferrous Metals,Beijing,China Mechanical and Electronical College,Nanchang University,Nanchang,China China National Nonferrous Metals Industry Techno-economic Institute,Beijing,China
材料科学技术学报 , 2005,
Abstract: The conjugation of semi-solid process technique and casting-rolling technique applied to produce the magnesium strips was studied. The semi-solid slurry hasbeen prepared continuously by the mechanical method and its temperature was controlled strictly at the same time. AZ91D and AZ31 casting magnesium alloys were applied to the experiment.The casting-rolling strips with non-dendritic structure were obtained and its main mechanical property is better. The process ability of the casting-rolling strips was studied. It is significative to link the semi-solid process techniques and casting-rolling techniques, through which we can get high quality magnesium alloy strips with non- dendritic structure and improve the overall properties of the products.
ELECTROLESS NICKEL PLATING ON AZ31 MAGNESIUM ALLOY SURFACE
AZ31镁合金表面化学镀镍工艺研究
SHI Xi-chang,YANG Hui-lan,XIAO Xiang,XU Hui,CHEN Bai-zhen,YANG Xi-yun,
石西昌,杨慧兰,肖湘,徐徽,陈白珍,杨喜云
腐蚀科学与防护技术 , 2009,
Abstract: 研究了在AZ31镁合金表面直接化学镀镍工艺,得到了镀液的最佳配方,镀液的成分为25 g/L NiSO4·6H2O、25 g/L次亚磷酸钠、15 g/L柠檬酸、10 g/L NH4F、1 mg/L硫脲.在温度为85℃、pH=9.0、反应时间1小时条件下可以在AZ31镁合金表面得到性能良好的Ni-P合金化学镀层,镀层厚度超过10 μm.用SEM、XRD和EDS研究了镀层的形貌和物相组成;在3.5%NaCI水溶液中通过测定Tafel极化曲线研究了镀层的耐腐蚀性能.结果表明,Ni-P镀层比皋体AZ31镁合金的耐腐蚀性能有极大的提高.
Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture
Kamineni Pitcheswara Rao,Yellapregada Venkata Rama Krishna Prasad,Joanna Dzwonczyk,Norbert Hort,Karl Ulrich Kainer
Metals , 2012, DOI: 10.3390/met2030292
Abstract: The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 °C, 350 °C and 450 °C have been studied in compression. The extruded material had a fiber texture with？parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the direction moved away from the extrusion axis. The processing maps for the material extruded at 300 °C and 350 °C are qualitatively similar to the material with near-random texture (cast-homogenized) and exhibited three dynamic recrystallization (DRX) domains. In domains #1 and #2, prismatic slip is the dominant process and DRX is controlled by lattice self-diffusion and grain boundary self-diffusion, respectively. In domain #3, pyramidal slip occurs extensively and DRX is controlled by cross-slip on pyramidal slip systems. The material extruded at 450 °C exhibited two domains similar to #1 and #2 above, which moved to higher temperatures, but domain #3 is absent. The results are interpreted in terms of the changes in fiber texture with extrusion temperature. Highly intense？texture, as in the rod extruded at 350 °C, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures >450 °C (domain #3).
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