NEW YORK – Prodded by the U.S. Department of Defense, which is eager to reduce the weight of combat armored vehicles, a team of researchers has developed a new breed of porous-metal foam alloys that make already lightweight magnesium and aluminum weigh even less. The team led by Nikhil Gupta, associate professor of mechanical and aerospace engineering at the Polytechnic Institute of New York University, mixes fly ash with magnesium or aluminum to produce metal foams targeted for use in ...

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