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Research Papers

Formability Analysis of Magnesium Alloy Sheets at Elevated Temperatures With Experimental and Numerical Method

[+] Author and Article Information
Lin Wang

Department of Industrial System Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P.R.C.mflindaw@inet.polyu.edu.hk

L. C. Chan

Department of Industrial System Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P.R.C.mflcchan@inet.polyu.edu.hk

T. C. Lee

Department of Industrial System Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P.R.C.mftclee@inet.polyu.edu.hk

J. Manuf. Sci. Eng 130(6), 061003 (Oct 09, 2008) (7 pages) doi:10.1115/1.2977823 History: Received September 19, 2007; Revised July 02, 2008; Published October 09, 2008

This paper describes a study in which thermomechanical properties of wrought magnesium were thoroughly investigated. The formability of the magnesium based alloy sheet at the elevated temperatures was assessed with a forming testing machine accompanied by a tailor-made temperature control system. The deformed laser printed circles on the magnesium sheet were measured to plot a forming limiting curve. The most used theoretical forming limiting diagram models were adopted to predict the forming limiting curve and the suitability of the model was checked for the formability prediction of the hexagonal close-packed metals at the elevated temperatures.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Instron high temperature tensile machine

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Figure 2

Shape of specimen for the tensile test

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Figure 3

Microstructure of the Mg alloy AZ31B at room temperature

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Figure 4

True stress-strain curves for AZ31B alloys at various temperatures when the strain rate is 1.54×10−2s−1

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Figure 5

Tensile curves when the angles between the rolling and tensile directions are 0deg, 45deg, and 90deg under three temperatures

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Figure 6

Anisotropic coefficient of the magnesium sheet under three temperatures

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Figure 7

Hille forming testing machine with closed loop temperature controller

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Figure 8

Specimens and types of grids for FLD measurement

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Figure 9

Experimental FLC of the Mg alloy at 200°C

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Figure 10

Experimental FLC of the Mg alloy at 300°C

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Figure 11

Comparison of the experimental FLC and Swift model predicted ones

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Figure 12

Comparison of the experimental FLC and vertex model predicted ones

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