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Bolt-Load Retention Behavior of Die-Cast AZ91D and AE42 Magnesium
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Abstract
The effect of temperature and preload on the bolt load retention (BLR) behavior of AZ91D and AE42 magnesium die castings was investigated. The results were compared to those of 380 aluminum die castings. Test temperatures from 125 to 175°C and preloads from 7 to 28 kN were investigated. The loss of preload for AZ91D was more sensitive to temperature than that observed for AE42, especially at low preloads. In general, retained bolt-load was lowest in AZ91D. All test assemblies were preloaded at room temperature and load levels increased when the assemblies reached test temperature. The load-increase was dependent on the preload level, test temperature, alloy, and results from thermal expansion mismatch between the steel bolt and the magnesium alloy components, mitigated by the onset of primary creep. Thermal exposure (aging) of AZ91D at 150°C improved BLR behavior.
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Authors
Citation
Sohn, K., Yurko, J., Jones, J., Kearns, J. et al., "Bolt-Load Retention Behavior of Die-Cast AZ91D and AE42 Magnesium," SAE Technical Paper 980090, 1998, https://doi.org/10.4271/980090.Also In
References
- Caton P.D. “Magnesium-an old material with new applica-tions,” Materials & Design 12 December 1991 309 316
- Luo A. Renaud J. Plourde J. “Recent metallurgical advances in light metals industries” Proceedings of the International Symposium on Recent Metallurgical Advances in Light Metals Industries Vancouver, British Columbia, Canada 1995
- Suman C. “Creep of diecast magnesium alloys AZ91D and AM60B,” SAE Technical Paper , 910416 Society of Automotive Engineer Warrendale, PA 1991
- Aune T.K. Westengen H. “Property update on magnesium die casting alloys,” SAE Technical Paper , 950424 Society of Automotive Engineer Warrendale, PA 1995
- Mercer W.E. II “Magnesium die cast alloys for elevated temperature applications,” SAE Technical Paper , 900788 Society of Automotive Engineer Warrendale, PA 1990
- Albright D.L. Aune T.K. “Stress relaxation behavior of die casting alloys,” S SAE Technical Paper , 910412 Society of Automotive Engineer Warrendale, PA 1991
- Sieracki E.G. Velazquez J.J. Kabiri K. “Compressive stress retention characteristics of high pressure die casting magnesium alloys,” SAE Technical Paper , 960421 Society of Automotive Engineer Warrendale, PA 1996
- Chen F.C. Jones J.W. McGinn T.A. Kearns J.E. Nielsen A.J. Allison J.E. “Bolt-load retention and creep of die-cast magnesium alloys,” SAE Technical Paper , 970325 Society of Automotive Engineer Warrendale, PA 1997
- Pettersen K. Fairchild S. “Stress relaxation in bolted joints of die cast magnesium components,” SAE Technical Paper , 970326 Society of Automotive Engineer Warrendale, PA 1997
- Clark J.B. “Age hardening in a Mg-9wt%Al alloy,” Acta Metallurgica 16 February 1968 141 151
- Suman C. “Heat treatment of magnesium die casting alloys AZ91D and AM60B,” SAE Technical Paper , 890207 Society of Automotive Engineer Warrendale, PA 1989
- Basner T.G. Evans M. Sakkinen D.J. “The effect of extended time aging on the mechanical properties of vertical vacuum cast aluminum-manganese and aluminum-rare earth magnesium alloys,” SAE Technical Paper , 930419 Society of Automotive Engineer Warrendale, PA 1993
- Dargusch M. Hisa M. Caceres C.H. Dunlop G.L. “Elevated temperature deformation of die cast Mg alloy AZ91D” Proceedings of the Third International Magnesium Conference Manchester, UK 1996
- Aune T.K. Riopelle L.A. “An evaluation of the mechanical properties critical to the design of interior magnesium components,” SAE Technical Paper , 960415 Society of Automotive Engineer Warrendale, PA 1996
- Diecasting Development Council NADCA product specification standards for die castings La Grange, Illinois Diecasting development council 1995
- Crawley A.F. Milliken K.S. “Precipitate morphology and orientation relationships in an aged Mg-9%Al-1%Zn-0.3%Mn alloy,” Acta Metallurgica 22 May 1974 557 562