G031015 Study on Compressive Forming Limit of Cast AZ31 Magnesium Alloy by Biaxial Compressions with Proportional and Non-proportional Strain Paths

2013 ◽  
Vol 2013 (0) ◽  
pp. _G031015-1-_G031015-3
Author(s):  
Daisuke AKIYAMA ◽  
Ichiro SHIMIZU ◽  
Naoya TADA
Keyword(s):  
Magnesium Alloy ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Strain Paths

Forming Limit of AZ31 Magnesium Alloy Sheet under Non-Proportional Deformation at Elevated Temperature

2013 ◽  
Vol 535-536 ◽  
pp. 292-295 ◽  
Author(s):  
Takashi Katahira ◽  
Tetsuo Naka ◽  
Masahide Kohzu ◽  
Fusahito Yoshida
Keyword(s):  
Magnesium Alloy ◽  
Plastic Strain ◽  
Elevated Temperatures ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Plastic Strain Increment ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet ◽  
Strain Paths

In the present work, FLDs of AZ31 magnesium alloy sheet for non-proportional strain paths were investigated by performing two-step stretch forming experiments at various forming speeds (3, 30 and 300 mm.min-1) at elevated temperatures of 150, 200 and 250°C. The forming limit strainSuperscript texts, both for proportional and non-proportional deformations, increased with temperature rise and with decreasing forming speed. A FLC after a uniaxial pre-strain lies outside of the proportional FLC for a given condition of temperature and forming speed, whereas a biaxially pre-strained FLC lies inside of the proportional FLC. It was found that the accumulated effective plastic strain and the direction of plastic strain increment at the final stage of forming are two major factors that influence the forming limits for non-proportional deformations.

1006 Effects of Temperature and Strain-Rate on Non-proportion Forming Limit Diagram for AZ31 Magnesium Alloy Sheets

2009 ◽  
Vol 2009.47 (0) ◽  
pp. 337-338
Author(s):  
Yosuke UEKAWA ◽  
Takashi KATAHIRA ◽  
Akiyoshi ODE ◽  
Testuo NAKA ◽  
Takeshi UEMORI ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Forming Limit Diagram ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Effects Of Temperature

Formability and Microstructure of AZ31 Magnesium Alloy Sheets

2007 ◽  
Vol 344 ◽  
pp. 31-38 ◽  
Author(s):  
Archimede Forcellese ◽  
Mohamad El Mehtedi ◽  
M. Simoncini ◽  
S. Spigarelli
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Microstructural Evolution ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Remarkable Increase ◽  
Temperature Range ◽  
Forming Limit Curves

The formability of AZ31 magnesium alloy sheets has been investigated in the temperature range varying from 200 to 300°C. Forming limit diagrams have been obtained by performing Nakazima-based tests. The different straining conditions have been investigated using sheet blanks with several length to width ratios. The forming limit curves have been related to the microstructural evolution occurring during deformation. The forming limit diagrams have shown a remarkable increase in formability with temperature that could be related to the occurrence of full dynamic recrystallization at 300°C.

319 Prediction of Forming Limit of AZ31 Magnesium Alloy Sheets under Non-proportional Deformation

2008 ◽  
Vol 2008.46 (0) ◽  
pp. 119-120
Author(s):  
Takashi KATAHIRA ◽  
Yosuke UEKAWA ◽  
Tetsuo NAKA ◽  
Takeshi UEMORI ◽  
Ryutaro HINO ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Az31 Magnesium Alloy ◽  
Forming Limit

Predicting forming limit diagrams for AZ31 magnesium alloy and 7050 aluminum alloy by numerical simulation

2020 ◽  
pp. 030932472098120
Author(s):  
Fengmei Xue ◽  
Yu Yan ◽  
Jincheng Kang
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Forming Limit Diagram ◽  
Az31 Magnesium Alloy ◽  
Instability Criterion ◽  
Forming Limit ◽  
Punch Force ◽  
Forming Limit Diagrams ◽  
Adjacent Element ◽  
7050 Aluminum Alloy

Forming limit diagram (FLD) is the most intuitive method to evaluate and analyze the forming performance of sheet metal, which is widely used in production. To examine the formability of AZ31 magnesium alloy and 7050 aluminum alloy, the simplified bulging models based on the Nakazima experiment are established by ABAQUS finite element (FE) software, and the maximum punch force criterion is adopted as the instability criterion. The forming limit diagrams of 7050 high-strength aluminum alloy at room temperature and AZ31 magnesium alloy at warm working conditions are obtained by extracting the in-plane strain of the adjacent element of the maximum strain element at the moment of instability. Compared with experimental observation shows that the Nakazima virtual model established in this paper can accurately predict FLD. In addition, the influences of lubrication conditions and virtual punching speeds on the bulging process of AZ31 and AA7050 sheet metals are also investigated. The results show that the better the lubrication environment, or the lower the punching speed, the better the formability of the sheet, and reducing the punching speed has a more significant improvement effect on the formability of AZ31 sheets.

Effects of Temperature and Sheet Thickness on Formability of AZ31 Magnesium Alloy

2008 ◽  
Vol 604-605 ◽  
pp. 147-152 ◽  
Author(s):  
P. Ricci ◽  
Mohamad El Mehtedi ◽  
L. Barone ◽  
S. Spigarelli
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Sheet Thickness ◽  
Optical Microscope ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Light Optical Microscope ◽  
Effects Of Temperature

The formability of AZ31 magnesium alloy sheets, with two different thicknesses, has been investigated at room temperature and 250°C by means of Nakazima tests. The different straining conditions have been studied by using sheet blanks with several length to width ratios, and Forming Limit Diagrams were then obtained with and without using lubricant. As expected, an increase in temperature was observed to enhance the formality of the alloy. The formability increases also by increasing the thickness as well as by using Teflon foil as lubricant. The microstructure of the deformed samples was analysed by means of light optical microscope.

Experimental Research on AZ31 Magnesium Alloy Sheet with Electromagnetic Forming and Quasi-Static Forming

2012 ◽  
Vol 509 ◽  
pp. 253-258 ◽  
Author(s):  
Fei Feng ◽  
Zheng Hua Meng ◽  
Shang Yu Huang ◽  
Jian Hua Hu ◽  
Zhi Lei He
Keyword(s):  
Magnesium Alloy ◽  
Forming Limit Diagram ◽  
Alloy Sheet ◽  
Electromagnetic Forming ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Magnesium Alloy Sheet ◽  
Punch Test ◽  
Az31 Magnesium Alloy Sheet ◽  
Forming Methods

Forming Limit Diagram of AZ31 magnesium alloy in different forming methods was researched in this paper. Experiment equipment and processes were improved successfully. Some tests and experiments (including tensile test, punch test and electromagnetic forming experiment) of AZ31 magnesium alloy sheet were done. Forming Limit Diagram of electromagnetic forming was established successfully. It could promote the application of magnesium alloy sheet in electromagnetic forming. Forming Limit Diagram of static forming was established successfully. It was very useful for the application of magnesium alloy sheet in other forming methods. The difference between these Forming Limit Diagram showed that electromagnetic forming obviously improve forming ability of the magnesium alloy sheet.

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