Divided Flow Extrusion of AZ31 Magnesium Alloy with Cerium and Antimony Addition

2011 ◽  
Vol 66-68 ◽  
pp. 736-740
Author(s):  
Bao Feng Zhang ◽  
Shuang Xi Li ◽  
Qing Kui Li ◽  
Ai Yun Jiang
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Deformation Temperature ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Extrusion Speed ◽  
Az31 Mg Alloy ◽  
Comprehensive Performance ◽  
Deformation Behaviors

Divided flow extrusion deformation behaviors and as-extruded tube properties of AZ31-Ce-Sb alloy were investigated. Addition of Sb and RE in AZ31 could accelerate the nucleation of dynamic recrystallization grains and refine tube microstructure. Compared to AZ31 Mg alloy, higher deformation temperature, extrusion speed and ration were allowed. AZ31-1%Ce-1%Sb alloy tubes had much better comprehensive performance.

Numerical Simulation and Experimental Verification of Microstructure Evolution during the Seamless Tube Extrusion of Semi-Continuous Casting AZ31 Magnesium Alloy

2017 ◽  
Vol 898 ◽  
pp. 79-85
Author(s):  
Tao Lin ◽  
Ji Xue Zhou ◽  
Bai Chang Ma ◽  
Yun Teng Liu ◽  
Di Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Continuous Casting ◽  
Dynamic Recrystallization ◽  
Volume Fraction ◽  
Seamless Tube ◽  
Compression Tests ◽  
Extrusion Speed ◽  
Tube Extrusion ◽  
Az31 Mg Alloy

Based on the stress-strain curves at the temperature of 300-450 °C with strain rate of 0.01-1 s−1 by hot compression tests, the empirical dynamic recrystallization models for the semi-continuous AZ31magnesium alloy were developed. The dynamic recrystallization evolution during the seamless tube extrusion of the AZ31 Mg alloy was simulated by numerical method with the derived models and validated by experiment measurements. The results show that at certain extrusion speed the influence of the extruding temperature on the dynamic recrystallization fraction was significant. With the increase of the extruding temperature the volume fraction of dynamic recrystallization increase obviously. The predicted dynamic recrystallization fraction was in an excellent agreement with the experimental results.

Effect of Restored Energy Items in Recrystallization Simulation of AZ31 Magnesium Alloy

2021 ◽  
Vol 1035 ◽  
pp. 827-832
Author(s):  
Jin Lin Xiong ◽  
Yan Wu ◽  
Qiang Luo ◽  
Ji Bing Chen ◽  
Wei Dong Cheng
Keyword(s):  
Magnesium Alloy ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Impact Factors ◽  
Az31 Mg Alloy ◽  
Simulation Results ◽  
The Impact

The effect of restored energy items in recrystallization simulation of AZ31 Mg alloy was studied with multi-order phase field model, and the impact factors during the recrystallization were discussed by changing the parameters of the restored energy item. The simulation results showed that the greater the restored energy, the greater the number of the recrystallized grains.

scholarly journals Comparison of Corrosion Resistance and Cytocompatibility of MgO and ZrO2 Coatings on AZ31 Magnesium Alloy Formed via Plasma Electrolytic Oxidation

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 441 ◽  
Author(s):  
Shimeng Wang ◽  
Lingxia Fu ◽  
Zhenggang Nai ◽  
Jun Liang ◽  
Baocheng Cao
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Corrosion Properties ◽  
Az31 Mg Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

In this work, one coating is comprised of ZrO2 and the other consists of MgO as main phase composition was produced on AZ31 magnesium alloy using one-step plasma electrolytic oxidation (PEO). The purpose of this work was to study the corrosion resistance and cytocompatibility of the above-coated AZ31 magnesium alloys in order to provide a basis for AZ31 Mg alloy’s clinical applications of biomedical use. The morphology and phase composition of the coatings were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion properties were examined using electrochemical testing, hydrogen evolution measurements, and immersion tests in a simulated body fluid (SBF). Compared with bare magnesium and the MgO coating, the ZrO2-containing coating exhibited an improved corrosion resistance. Cell proliferation assays and cell morphology observations showed that the ZrO2-containing coating was not toxic to the L-929 cells. The ZrO2 coating was much denser and more homogeneous than the MgO coating, hence the corrosion resistance of the ZrO2-coated AZ31 Mg alloy was superior and more stable than the MgO-coated AZ31 Mg alloy, and ZrO2/AZ31 did not induce a cytotoxic reaction to L-929 cells and promote cell growth.

Microstructure Evolution in AZ31 Magnesium Alloy Worked by Torsion at Warm Temperature

2010 ◽  
Vol 654-656 ◽  
pp. 727-730 ◽  
Author(s):  
Koji Aoyama ◽  
Mitsuaki Furui ◽  
Susumu Ikeno
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Microstructure Evolution ◽  
Deformation Temperature ◽  
Rotation Speed ◽  
Az31 Magnesium Alloy ◽  
Warm Temperature ◽  
Az31b Magnesium Alloy ◽  
Warm Working ◽  
Warm Condition

It had been already reported that the resistance of compression at warm condition can be decreased by the preliminary torsion working at AZ31B magnesium alloy. In the present study, it was found that the dynamic recrystallization occured during warm working by torsion. Dynamic recrystallization was slightly seen in the fractured edge of the bar at a rotation speed of 1rpm at temperature 573K and 623K. The amount of torsion to fracture was increased with increasing of deformation temperature. Remarkable dynamic recrystallization could be seen in the center of bar at the rotation speed of 1rpm at temperature of 673K.

THE DEVELOPMENT OF THE MICROSTRUCTURE AND TEXTURE IN COLD ROLLED AZ31 MG ALLOY SHEETS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5925-5930 ◽  
Author(s):  
INSOO KIM ◽  
SAIDMUROD AKRAMOV
Keyword(s):  
Magnesium Alloy ◽  
Optical Microscopy ◽  
Room Temperature ◽  
Rolling Direction ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Sheet Metals ◽  
X Ray ◽  
Az31 Mg Alloy ◽  
Cold Rolled

Formability is very important parameter of magnesium alloy sheets and it would be related to the texture of sheet metals. In this study, magnesium alloy sheets with strong {0002} texture were cut along the angles of 0, 12.5, 25 and 37.5 degrees to rolling direction (RD). Prepared samples were rolled at room temperature condition. Cold rolled AZ31 magnesium alloy sheets along the angles of 0, 12.5, 25, 37.5 and 45 degrees to rolling direction were investigated microstructure and texture with optical microscopy and x-ray diffractometer, respectively.

The Deformation Behavior of Thermal Compression for ZK30 Magnesium Alloy

2014 ◽  
Vol 541-542 ◽  
pp. 12-17
Author(s):  
Bao Dong Chen ◽  
Feng Guo ◽  
Jing Wen
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Type Equation ◽  
Nonlinear Flow ◽  
Thermal Compression ◽  
Deformation Behaviors

In order to improve the understanding deformation behaviors of thermal compressive of ZK30 magnesium alloy, carried out a series of thermal compressive tests with height reduction 60% of specimens were performed at deformation temperature range of 523-673 K, and strain rates range of 0.001-1 s−1 on Gleeble-1500 thermo-mechanical simulator. Based on an Arrhenius-type equation constructs a nonlinear flow model and its constitutive equation, are employed to study the deformation behavior and the relationship between deformation temperature, strain rate and flow stress. For higher deformation temperature and lower strain rate, the true stress-strain curves show a characteristic of dynamic recrystallization. With the increase of deformation temperature and the decrease of strain rate the flow stress decreases, also the dynamic recrystallization becomes easier.

Influnce of Grain Size on Dynamic Recrystallization of AZ31 Magnesium Alloy Rolling Sheet

2013 ◽  
Vol 395-396 ◽  
pp. 218-222 ◽  
Author(s):  
Chen Yang Xu ◽  
Fu Xiang Chu ◽  
Xiao Ling Xu ◽  
Hao Chen ◽  
Fang Gao
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Microstructure Evolution ◽  
Deformation Temperature ◽  
Az31 Magnesium Alloy ◽  
Deformation Condition ◽  
Evolution Characteristics ◽  
C 30

Microstructure evolution characteristics and the influence of the intial grain size on the dynamic recrystallization of AZ31 were investigated by rolling at deformation temperature of 280 °C, 30% reduction and strain rate of 5.6s-1. The results indicate that under the present deformation condition, when the grain size is 6.2μm the dynamic recrystallization does not occur , twinning dynamic recrystallization (TDRX) occurs when the original grain size are of 7.9μm and 12.7μm, when the original grain size is 21.1μm rotating dynamic recrystallization (RDRX) occurs.

Friction Stir Welding of Dissimilar Formed Mg Alloys (AZ31/AZ91)

2005 ◽  
Vol 486-487 ◽  
pp. 249-252 ◽  
Author(s):  
Chang Yong Lee ◽  
Won Bae Lee ◽  
Yun Mo Yeon ◽  
Seung Boo Jung
Keyword(s):  
Friction Stir Welding ◽  
Dynamic Recrystallization ◽  
Tensile Test ◽  
Intermetallic Compounds ◽  
Grain Growth ◽  
Weld Zone ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Friction Stir ◽  
Az31 Mg Alloy

Friction stir welding of dissimilar formed Mg alloys(AZ31/AZ91) was successfully carried out at the limited welding conditions. In a sound joint, SZ was mainly consisted of AZ31 Mg alloy which was located the retreating side. Dynamic recrystallization and grain growth occurred and β intermetallic compounds of AZ 91 Mg alloy was not observed in SZ. BM had a higher hardness than that of the weld zone. The fracture location was not weld zone but BM of the AZ91 Mg alloy in tensile test.

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