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TECHNICAL PAPERS

Mechanical Performance Evaluation of Cast Magnesium Alloys for Automotive and Aeronautical Applications

[+] Author and Article Information
Sp. G. Pantelakis, A. N. Chamos

Department of Mechanical and Aeronautical Engineering, Laboratory of Technology and Strength of Materials, University of Patras, 26500 Patras, Greece

N. D. Alexopoulos1

Department of Rural and Surveying Engineering, Laboratory of Structural Mechanics, National Technical University of Athens, Zografou Campus, 9 Iroon Polytechniou Street, 15780 Athens, Greecenalexop@tee.gr

1

Corresponding author.

J. Eng. Mater. Technol 129(3), 422-430 (Dec 13, 2006) (9 pages) doi:10.1115/1.2744407 History: Received May 08, 2006; Revised December 13, 2006

The potential of cast magnesium alloys for being used as structural materials in lightweight applications is assessed. The ability of the alloys for mechanical performance is evaluated and compared against the ability of widely used structural aircraft cast aluminum alloys. The specific quality index QDS, devised for evaluating both cast and wrought aluminum alloys, will be exploited to evaluate the ability of a number of cast magnesium alloys for mechanical performance. The exploited quality index QDS involves the material’s yield strength Rp to account for strength, the strain energy density W to account for both tensile ductility and toughness, and the material’s density ρ. The effects of differences in chemical composition and heat treatment conditions on the mechanical performance of cast magnesium alloys have been assessed. The use of the quality index QDS has been proved to appreciably facilitate the evaluation of the mechanical performance of cast magnesium alloys and also the comparison between alloys of different base materials. The results quantify the gap to be closed such as to involve cast magnesium alloys in aircraft structural applications.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Yield and tensile strength; and (b) elongation to fracture and strain energy density of AM cast magnesium alloys with the variation in the aluminum content (strength properties and elongation to fracture data are taken from Aune (15); strain energy density data are calculated using Eq. 10)

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Figure 2

Variation of the quality index Q0 for the investigated AM cast magnesium alloys with the variation in the Al content; Q0 values are calculated by means of Eq. 4

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Figure 3

Quality map on the basis of the quality index Q0 of Eq. 4 for the investigated AM cast magnesium alloys with variations in the Al content

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Figure 4

(a) Yield and tensile strength; and (b) elongation to fracture and strain energy density of QE22A cast magnesium alloy subjected to different solid solution heat treatment conditions (strength properties and elongation to fracture data are taken from Avedesian (17); strain energy density data are calculated using Eq. 10

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Figure 5

Variation of the quality index Q0 for the investigated QE22A cast magnesium alloy for different solid solution heat treatment temperatures; Q0 values are calculated by means of Eq. 4

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Figure 6

Quality map on the basis of quality index Q0 of Eq. 4 of the QE22A cast magnesium alloy for different solid solution heat treatment temperatures

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Figure 7

(a) Yield strength Rp; (b) tensile strength Rm; (c) elongation to fracture Af; and (d) strain energy density W of the QE22A cast magnesium alloy for different artificial aging heat treatment conditions (strength properties and elongation to fracture data are taken from Avedesian (17); strain energy density data are calculated using Eq. 10)

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Figure 8

Variation of the quality index Q0 of the QE22A cast magnesium alloy for the different artificial aging heat treatment conditions; Q0 values are calculated by means of Eq. 4

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Figure 9

Quality map on the basis of the quality index Q0 of Eq. 4 of the QE22A cast magnesium alloy for the different artificial aging heat treatment conditions (numbers refer to test series according to Table 3)

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Figure 10

Quality maps on the basis of the quality indices: (a)Q0; (b)Q0S of Eqs. 4,2, respectively, for the investigated cast aluminum and magnesium alloys

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