Abstract
Deformation behavior and formability limits of thixo-molded Mg AZ61L alloy and regular Mg AZ61 alloy sheets (with similar chemical compositions except for Mn content) were experimentally investigated at elevated temperature. Tensile (uniaxial), hydraulic bulge (biaxial) tests as well as closed-die hydroforming tests were conducted to understand the material behavior at temperatures ranging from 25 °C to 300 °C and strain rates at 0.0013, 0.013 and 0.13 s−1. It was found that flow stress and the maximum plastic strain increased with increasing temperature and decreasing strain rate. Closed-die warm hydroforming tests were also performed to determine the process window for the sheet alloy. Die cavity filling ratios and thinning of the sheet blanks were measured with non-contact optical photogrammetry. Results indicated that lower strain rates and higher temperatures increase formability, particularly above temperatures of 200 °C.
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References
W. F. Powers “Automotive Materials in the 21st Century”, Advanced Materials &Processes, 157–5, (2000), 38–41.
J. A. Carpenter “The FreedomCAR challenge and steel”, American Iron and Steel Institute, Great Designs in Steel Seminar, February 24, 2004, Livonia, MI.
R. A. Schultz “Aluminum for light vehicles - An objective look at the next ten to twenty years”(Ducker Research), 14th International Aluminum Conference, September 15, 1999, Montreal, Canada.
M. Easton “Mg Alloy Applications and Automotive Structures”, Journal of Materials, 60, (2008), 57–62.
S. Novotny and M. Geiger “Process design for hydroforming of lightweight metal sheets at elevated temperatures”, Journal of Materials Processing Technology, 138, (2004), 594–599.
E. Doege and K. Dröder “Sheet metal forming of magnesium wrought alloys - formability and process technology”, Journal of Materials Processing Technology, 115, (2001), 14–19.
S. R. Agnew and O. Duygulu “A mechanistic understanding of the formability of magnesium: Examining the role of temperature on the deformation mechanisms”, Materials Science Forum, 419–422, (2003), 177–188.
M. R. Barnett “Twinning and the ductility of magnesium alloys Part I: “Tension”twins”, Materials Science and Engineering A, 464, (2007), 1–7.
H. Takuda et al., “Modeling of formula for flow stress of a magnesium alloy AZ31 sheet at elevated temperatures”, Journal of Materials Processing Technology, 164–165, (2005), 1258–1262.
R. Neugebauer et al., “Sheet metal forming at elevated temperatures”, Annals of the CIRP, 55–2, (2006), 793–816.
S. Kaya et al., “Determination of the flow stress of magnesium AZ31–0 sheet at elevated temperatures using the hydraulic bulge test”, International Journal of Machine Tools and Manufacture, 48, (2008), 550–557.
K. Siegert S. Jäger and M. Vulcan “Pneumatic bulging of magnesium AZ31 sheet metals at elevated temperatures”, CIRP Annals-Manufacturing Technology, 52–1, (2001), 241–244.
[13] J. M. Kim et al., “Microstructure and mechanical properties of thixocast Mg-Cu-Y alloy”, Scripta Materialia, 49–7, (2003), 687–691.
[14] S. Mahabunpachai and M. Koç, “Material behavior and formability of magnesium AZ31 sheet alloy under warm hydroforming conditions”, Materials Forum, 34, (2010), 105–109.
[15] M. Koç, E. Billur, and Ö.N. Cora, “An experimental study on the comparative assessment of hydraulic bulge test analysis methods”, Materials and Design, 32, (2011), 272–281.
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© 2012 TMS (The Minerals, Metals & Materials Society)
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Koç, M., Cora, Ö.N., Snell, R., Decker, R., Huang, J. (2012). Experimental Investigations into the Deformation Behavior of Thixo-Molded Mg AZ61L Sheet Alloy. In: Mathaudhu, S.N., Sillekens, W.H., Neelameggham, N.R., Hort, N. (eds) Magnesium Technology 2012. Springer, Cham. https://doi.org/10.1007/978-3-319-48203-3_73
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DOI: https://doi.org/10.1007/978-3-319-48203-3_73
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48571-3
Online ISBN: 978-3-319-48203-3
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