Mechanical Properties and Fatigue Behavior of Age Treated Die Cast AlMg5Si2Mn Alloy

Abstract:

Mechanical properties and fatigue behavior of die cast AlMg5Si2Mn alloy are studied to broaden its application. Results indicate that the microstructure consist of coarse α₁-Al crystals, fine α₂-Al and eutectic [Al+Mg₂S region. Dilatant shear band and surface layer are observed in the surface and sub-surface of the die castings. Ultimate tensile strength, yield strength and elongation of as-cast AlMg5Si2Mn alloy are 333MPa, 191MPa and 10.7% respectively. Age treatment significantly improves the strength and slightly decreases the elongation. Fatigue limit of AlMg5Si2Mn is 56MPa and the fatigue lives of as-cast and age treat specimens are similar to each other. Uniform fatigue striations and tear ridges are observed in the fatigue fracture.

• Periodical: Advanced Materials Research (Volume 704)
• Pages: 126-131
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.704.126
• Online since: June 2013
• Authors: Zu Qi Hu, Li Wan, Shu Sen Wu, Xue Qiang Liu
• Keywords: Age Treatments, AlMg5Si2Mn, Die Casting, Elongation, Fatigue Life

References

[1] Niu XP, Hu BH, Pinwill I, Li H. Vacuum assisted high pressure die casting of aluminium alloys. J Mater Process Technol. 2000;105:119-27.

DOI: 10.1016/s0924-0136(00)00545-8

[2] Brungs D. Light weight design with light metal castings. Mater Design. 1997;18:285-91.

DOI: 10.1016/s0261-3069(97)00065-4

[3] Carle D, Blount G. The suitability of aluminium as an alternative material for car bodies. Mater Design. 1999;20:267-72.

DOI: 10.1016/s0261-3069(99)00003-5

[4] Kaufmann H, Uggowitzer PJ. Metallurgy and Processing of High-Integrity Light Metal Pressure Castings: Schiele & Schön; 2007.

[5] With M, Koch H, Klos R. Experiences from the mass production of die cast steering wheel frames from the alloy AlMg5Si2Mn. Giesserei (Germany). 1999;86:185-9.

[6] ASTM Standard B85: Standard Specification for Aluminum-Alloy Die Castings. Annual book of ASTM Standards, vol.02.02 ed. USA: ASTM International; 2010.

[7] Greven K, Dragulin D. Ductile High Pressure Die Casting - Heat Treated or Temper F? the 2nd International Conference on Light Metals Technology2005. pp.221-6.

[8] Koch H, Hielscher U, Sternau H, Franke A. Magsimal-59-an AlMgMnSi type squeeze casting alloy designed for temper F Light Metals 1996:933-7.

[9] Kaufmann H, Uggowitzer PJ. Fundamentals of the New Rheocasting Process for Magnesium Alloys. Adv Eng Mater. 2001;3:963-7.

DOI: 10.1002/1527-2648(200112)3:12<963::aid-adem963>3.0.co;2-x

[10] Grimmig T, Ovcharov A, Afrath C, Bunck M, Buhrig-Polaczek A. Potential of the rheocasting process, demonstrated on different aluminum based alloy systems. In: Kang CG, Kim SK, Lee SY, editors. Semi- Solid Processing of Alloys and Composites. Stafa-Zurich: Trans Tech Publications Ltd; 2006. pp.484-8.

[11] Hu Z, Wan L, Wu S, Wu H, Liu X. Microstructure and mechanical properties of high strength die-casting Al–Mg–Si–Mn alloy. Mater Design. 2013;46:451-6.

DOI: 10.1016/j.matdes.2012.10.020

[12] Franke R, Dragulin D, Zovi A, Casarotto F. Progress in ductile aluminum high pressure die casting alloys for the automotive industry. la metallurgia italiana. 2007.

[13] Otarawanna S, Gourlay CM, Laukli HI, Dahle AK. Formation of the surface layer in hypoeutectic Al-alloy high-pressure die castings. Mater Chem Phys. 2011.

DOI: 10.1016/j.matchemphys.2011.06.035

[14] Otarawanna S, Laukli HI, Gourlay CM, Dahle AK. Feeding Mechanisms in High-Pressure Die Castings. Metall. Mater. Trans A. 2010;41:1836-46.

DOI: 10.1007/s11661-010-0222-6

[15] Ji S, Watson D, Fan Z, White M. Development of a super ductile diecast Al–Mg–Si alloy. Mater Sci Eng A. 2012;556:824-33.

DOI: 10.1016/j.msea.2012.07.074