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

Issue link: http://amp.digitaledition.asminternational.org/i/466012

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Understanding failUre in glassy materials Researchers at University of Penn- sylvania, Philadelphia, discovered an important commonality that seems to extend through the wide range of glassy materials. They demonstrated that the scaling between a glassy material's stiff- ness and strength remains unchanged, implying a constant critical strain that these materials can withstand before catastrophic failure, despite the extreme variation found among the physical properties of different glasses. This con- stant critical strain provides insight into the fundamental "seed" out of which glass failure grows—a small group of the glass's constituent particles or atoms that change shape in a collective way. Despite the disorder that epitomizes glass, this coordinated activity appears to be universal among many glassy sys- tems, such as certain metals, polymers, and colloids, and is an important starting point for designing more durable materi- als. For more information: Daniel Gianola, 215.898.7246, gianola@seas.upenn.edu, www.seas.upenn.edu. inaUgUral photonic pressUre sensor oUtshines mercUry model A unique pressure-sensing device recently surpassed the performance of the best mercury-based techniques in resolution, speed, and range at a frac- tion of the size, according to scientists at NIST, Gaithersburg, Md. The new in- strument, called a fixed-length optical cavity (FLOC), works by detecting sub- tle changes in the wavelength of light passing through a cavity filled with ni- trogen gas. The FLOC system is poised to de- pose traditional mercury pressure sen- sors (manometers) as the standard used to calibrate commercial equipment, according to researchers. The new de- sign is also a promising candidate for a factory-floor pressure instrument that could be used by a range of industries, in- cluding semiconductor, glass, and aero- testing | characteriZation Briefs Nikon Instruments Inc., Melville, N.Y., entered a strategic partnership with JEOL, Peabody, Mass., to develop techniques to address correlative light and electron microscopy. Along with progress in super-resolution technologies, there is growing interest in correlating light microscopy data with electron microscopy data to further push the limits of resolution. The alliance plans to develop tools to combine the advantages of both methods. nikoninstruments.com, jeolusa.com. Microscope image of a micropillar failing afer the formation of a shear band. S I gma LabS I Nc., Santa Fe, n.M., a developer oF inSpection S ySte MS For Metal-baSed additive ManuFacturing technologieS, received a contract FroM honeywell aeroSpace aS part oF a D E f ENSE aDva Nc ED R ESE a R ch P ROJEct ag ENcy ( darpa ) phaSe ii award to develop an integrated coMputational MaterialS engineering ( ic Me ) FraMework to accurately predict the propertieS oF Metal coMponentS produced uS ing additive ManuFacturing. sigmalabsinc.com. Floc gauges pressure by detecting subtle diferences in the wavelength of light resonating in two channels. courtesy of niSt. 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 1 0

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