Advanced Materials & Processes

FEB 2015

Covers developments in engineering materials selection, processing, fabrication, testing/characterization, materials engineering trends, and emerging technologies, industrial and consumer applications, as well as business and management trends

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with about 200,000 units per production line allows the highly concentrated, ef- ficient use of carbon fiber, while at the same time meeting all safety require- ments. Results of an initial rear-impact crash test demonstrate that the CAMIS- MA prototype satisfied all of the strength requirements of current seats built with a metal structure in large-scale series pro- duction. In addition to significant weight savings, CAMISMA offers a further advan- tage: The manufacturing steps required in assembly are substantially reduced through the number of attachment parts needed, which also saves cost. alloYIng toughER tungStEn New tungsten alloys being devel- oped at Massachusetts Institute of Tech- nology, Cambridge, could replace deplet- ed uranium in armor-piercing projectiles. Depleted uranium poses a potential health hazard to soldiers and civilians. A new alloy with chromium and MIT graduate student Zack Cordero removes a vacuum-sealed glass ampoule from a box furnace operating at 1100°C used to anneal metal powders. Courtesy of Denis Paiste/ Materials Processing Center. iron (W-7Cr-9Fe) is significantly stron- ger than commercially available tung- sten alloys, reports graduate student Zachary Cordero. To achieve this, metal powders were compacted in a field-assisted sintering hot press, with the best result attained at a processing time of one minute at 1200°C. Cordero achieved ultrafine grain structure of about 130 nm in the W-7Cr- 9Fe compact, confirmed by electron mi- crographs. "Using this powder process- ing route, we can make big samples up to 2 cm in diameter, or we could go bigger, with dynamic compressive strengths of 4 GPa." For more information: Zachary Cordero,, A D V A N C E D M A T E R I A L S & P R O C E S S E S | F E B R U A R Y 2 0 1 5 9

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