scholarly journals Deformation Behavior on Small-Diameter ZM21 Magnesium Alloy Tube in Warm Tube Hydroforming

2019 ◽  
Vol 60 (707) ◽  
pp. 346-351 ◽  
Author(s):  
Hajime YASUI ◽  
Shoichiro YOSHIHARA ◽  
Ryuich YAMADA ◽  
Yasumi ITO
Keyword(s):  
Magnesium Alloy ◽  
Deformation Behavior ◽  
Tube Hydroforming ◽  
Small Diameter ◽  
Alloy Tube ◽  
Zm21 Magnesium Alloy

scholarly journals Influence of Internal Pressure and Axial Compressive Displacement on the Formability of Small-Diameter ZM21 Magnesium Alloy Tubes in Warm Tube Hydroforming

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 674 ◽  
Author(s):  
Hajime Yasui ◽  
Taisuke Miyagawa ◽  
Shoichiro Yoshihara ◽  
Tsuyoshi Furushima ◽  
Ryuichi Yamada ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Internal Pressure ◽  
Deformation Behavior ◽  
Tube Hydroforming ◽  
Small Diameter ◽  
Forming Limit ◽  
Outer Diameter ◽  
Fe Method ◽  
Zm21 Magnesium Alloy ◽  
Forming Defects

In this study, the influence of internal pressure and axial compressive displacement on the formability of small-diameter ZM21 magnesium alloy tubes in warm tube hydroforming (THF) was examined experimentally and numerically. The deformation behavior of ZM21 tubes, with a 2.0 mm outer diameter and 0.2 mm wall thickness, was evaluated in taper-cavity and cylinder-cavity dies. The simulation code used was the dynamic explicit finite element (FE) method (FEM) code, LS-DYNA 3D. The experiments were conducted at 250 °C. This paper elucidated the deformation characteristics, forming defects and forming limit of ZM21 tubes. Their deformation behavior in the taper-cavity die was affected by the axial compressive direction. Additionally, the occurrence of tube buckling could be inferred by changes of the axial compression force, which were measured by the load cell during the processing. In addition, grain with twin boundaries and refined grain were observed at the bended areas of tapered tubes. The hydroformed samples could have a high strength. Moreover, wrinkles, which are caused under a lower internal pressure condition, were employed to avoid tube fractures during the axial feeding. The tube with wrinkles was expanded by a straightening process after the axial feed. It was found that the process of warm THF of the tubes in the cylinder-cavity die was successful.

Warm Hydroforming Process with Non-Uniform Heating for AZ31 Magnesium Alloy Tube

2010 ◽  
Vol 654-656 ◽  
pp. 739-742 ◽  
Author(s):  
Kenichi Manabe ◽  
Toshiji Morishima ◽  
Yu Ogawa ◽  
Kazuo Tada ◽  
Tsutomu Murai ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Magnesium Alloy ◽  
Tube Hydroforming ◽  
Az31 Magnesium Alloy ◽  
Fe Model ◽  
Uniform Heating ◽  
Forming Process ◽  
Alloy Tube ◽  
Warm Hydroforming

In this study, non-uniform heating approach in warm T-joint forming process is attempted for the AZ31 magnesium alloy tube. For this purpose, finite element simulation is performed to analyze the appropriate temperature distribution. The validity of the finite element(FE) model of T-joint tube hydroforming(THF) is verified by comparing the FE simulation and experimental results. Using this FE model, appropriate temperature distribution was suggested. In addition, it was showed that the wall thickness could be more uniform by optimizing the temperature condition.

Dynamic Deformation Behavior of As-Extruded Mg-Gd-Y Magnesium Alloy and the Microstructural Evolution

2011 ◽  
Vol 284-286 ◽  
pp. 1579-1583
Author(s):  
Ping Li Mao ◽  
Zheng Liu ◽  
Chang Yi Wang ◽  
Feng Wang
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Deformation Behavior ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Deformation ◽  
Strain Rates ◽  
Compression Axis ◽  
Deformation Localization ◽  
Dynamic Deformation Behavior

The dynamic deformation behavior of an as-extruded Mg-Gd-Y magnesium alloy was studied by using Split Hopkinson Pressure Bar (SHPB) apparatus under high strain rates of 102 s-1 to 103s-1 in the present work, in the mean while the microstructure evolution after deformation were inspected by OM and SEM. The results demonstrated that the material is not sensitive to the strain rate and with increasing the strain rate the yield stress of as-extruded Mg-Gd-Y magnesium alloy has a tendency of increasing. The microstructure observation results shown that several deformation localization areas with the width of 10mm formed in the strain rates of 465s-1 and 2140s-1 along the compression axis respectively, and the grain boundaries within the deformation localization area are parallel with each other and are perpendicular to the compression axis. While increasing the strain rate to 3767s-1 the deformation seems become uniform and all the grains are compressed flat in somewhat. The deformation mechanism of as-extruded Mg-Gd-Y magnesium alloy under high strain rate at room temperature was also discussed.

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