Magnesium-based Metal-Metal Composites
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
Metal-metal fiber-reinforced composites with high ductility and high strength have previously been produced by deformation processing Cu and Ti binary alloys. Mg-X alloys (where X =Ti, Nb, and Fe) have also been deformation processed to produce high-strength, high-ductility composites which have stable microstructures when exposed to 400°C for 500 hours. In these experiments, metal-metal composites consisting of a matrix of Mg or Mg-12wt%Li-2wt%Nd were produced by infiltrating a 10-20% dense steel wool with the molten matrix alloy. The Mg/IOSW material did not roll well, even at 300°C. However, the Mg-12Li-2Nd/20SW had excellent ductility at room temperature and it was reduced 99.6% without annealing, producing a composite sheet with highly elongated, nano-scale steel filaments. These Mg-based composites were evaluated by mechanical testing, microscopy, and high-temperature annealing to determine the relation between processing, microstructure, and properties. It is believed that deformation processing can be used to successfully develop a Mg-based composite with low density, high strength, high ductility, high fracture toughness, and excellent thermal stability. Such a Mg-based composite would represent a truly unique method for producing commercially viable structural materials.
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This chapter is published as Jensen, J. A., Alan M. Russell, T. W. Ellis, and L. Scott Chumbley. "Magnesium-based Metal-Metal Composites." In Aluminum and Magnesium for Automotive Applications. (Proceedings of a symposium sponsored by the Structural Materials Division (SMD) Non-Ferrous Metals Committee of the Minerals, Metals & Materials Society (TMS), J. Daniel Bryant and Dawn R. White, eds.) Warrendale, PA: The Minerals, Metals & Materials Society, 1996. Pages 173-187. Posted with permission.