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Article
Structural transitions and local deformation processes at and near grain boundaries
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Article
A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754
Three-dimensional, matrix-based statistical analysis methods were developed and integrated with high-resolution topographical imaging, to assess how microstructural changes influence the evolution of plastic d...
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Article
Textural Development of AA 5754 Sheet Deformed under In-Plane Biaxial Tension
Crystallographic texture evolution was quantified as a function of biaxial strain level and strain path for AA5754-O sheet metal in an effort to provide a physical description of grain rotation resulting from ...
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Article
Microscopic fracture mechanisms observed on Cu–Sn frangible bullets under quasi-static and dynamic compression
The damage behavior of Cu–Sn frangible bullets was characterized in an effort to aid predictions of impact performance of these projectiles with soft body armor through finite element simulations. Fracture sur...
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Article
The role of metallurgy in the NIST investigation of the World Trade Center towers collapse
On August 21, 2002, on the direction of the U.S. Congress, the National Institute of Standards and Technology (NIST) initiated an investigation into the collapse of the World Trade Center (WTC) towers. In supp...
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Article
A Method for Direct Measurement of Multiaxial Stress-Strain Curves in Sheet Metal
A method has been developed that allows measurement of stress-strain curves for sheet metal being deformed in multiaxial tension. The strain state is imposed using a modification of the Marciniak in-plane biax...
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Article
Assessment of structural steel from the World Trade Center towers, part V: forensic photographic evidence of tower collapse initiation and progression
Photographic forensic evidence for the global collapse of the World Trade Center (WTC) towers was developed as part of the National Institute of Standards and Technology (NIST) WTC collapse investigation. The ...
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Article
Assessment of structural steel from the World Trade Center towers, part IV: Experimental techniques to assess possible exposure to high-temperature excursions
Recovered structural steel from the World Trade Center was examined as part of the National Institute of Standards and Technology investigation to provide data on potential temperature excursions seen by the s...
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Article
Assessment of structural steel from the World Trade Center towers, part I: Recovery and identification of critical structural elements
The National Institute of Standards and Technology conducted a 3-year, $16 million investigation of the World Trade Center (WTC) disaster in response to the events of September 11, 2001. A primary goal of the ...
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Article
Assessment of structural steel from the World Trade Center towers, part III: Physical damage caused by impact of aircraft
This paper describes damage characteristics and failure modes of the recovered structural steel components from the World Trade Center (WTC) towers WTC 1 and WTC 2. Knowledge of damage to the steel elements pl...
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Article
Assessment of structural steel from the World Trade Center towers, part II: Analysis of images for forensic information
A meaningful modeling analysis of the collapse of the World Trade Center towers required documentation of the damage of the buildings due to the aircraft impacts. Images accumulated during the National Institu...
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Article
Effect of intermediate heat treatment on microstructure and texture evolution of continuous cast Al-Mn-Mg alloy sheet
The microstructure and crystallographic texture evolution of continuous-cast, hot-rolled Al-Mn-Mg alloy sheet during cold rolling and subsequent annealing was investigated. All specimens cut from the as-receiv...
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Article
Through-thickness texture gradient in an annealed Al-Mg Alloy sheet
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Article
Through-thickness texture gradient in an annealed Al-Mg alloy sheet
Through-thickness crystallographic texture of a rolled and subsequently annealed Al-Mg continuous cast (CC) alloy was examined. Results showed that the annealed sheet developed a through-thickness texture grad...
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Article
Evolution of strain-induced microstructure and texture in commercial aluminum sheet under balanced biaxial stretching
The evolution of surface topography and crystallographic texture was investigated under balanced biaxial stretching in sheets of the aluminum alloy 5052-H32. Two different lots of material, with an initial nom...
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Article
Dilution control in gas-tungsten-arc welds involving superaustenitic stainless steels and nickel-based alloys
Fusion welds were prepared between a superaustenitic stainless steel, (the AL-6XN alloy) and two Ni-based filler metals (IN625 and IN622) using the gas-tungsten-arc welding (GTAW) process. Fusionzone compositi...
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Article
Sheet metal formability studies at the national institute of standards and technology
Sheet-metal forming is a multi-billion-dollar industry in the United States, with an overwhelming portion of its use in automotive markets as formed-sheet components. With roughly one-third of the weight of an...
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Article
Growth of Nodular Corrosion Products on Fe–Al Alloys in Various High-Temperature Gaseous Environments
The mechanisms for nodular corrosion-product development were investigatedin various high-temperature gaseous environments. Fe–Al alloys, with5–20 wt.% Al, were exposed in both oxidizing and sulfidizing[p(S2)=10−...
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Article
The effect of aluminum content on the corrosion behavior of Fe-Al alloys in reducing environments at 700 °C
The high-temperature corrosion behavior of monolithic Fe-Al alloys, with 0 to 20 wt pct Al, was investigated at 700 °C in a reducing atmosphere (p(S2) = 10−4 atm, p(O2) = 10−25 atm) for up to 100 hours. Postexpos...
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Article
Characterization of single and discretely-stepped electro-composite coatings of nickel-alumina
Electrodeposition from a sulfamate bath has been used to produce single layer and discretely stepped electro-composites consisting of a metallic nickel matrix with second phase alumina (α-Al2O3) particles. Light ...
