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

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.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.604-605.147 ◽

2008 ◽

Vol 604-605 ◽

pp. 147-152 ◽

Cited By ~ 3

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.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.509.253 ◽

2012 ◽

Vol 509 ◽

pp. 253-258 ◽

Cited By ~ 3

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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