The Experts below are selected from a list of 4542 Experts worldwide ranked by ideXlab platform
Mala M. Sharma - One of the best experts on this subject based on the ideXlab platform.
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A Microscopic Study on the Corrosion Fatigue of Ultra-Fine Grained and Conventional Al–Mg Alloy
Corrosion Science, 2015Co-Authors: Mala M. Sharma, Josh D. Tomedi, Jeffrey ParksAbstract:The corrosion behavior of a nanocrystalline (NC)/ultrafine grained (UFG) Al–Mg based alloy was investigated and compared to its conventional counterpart 5083(H111). The corrosion fatigue (CF) was studied with respect to pit initiation, pit location and crack propagation as a function of environment. Scanning electron microscopy (SEM) with EDS was used to analyze the fracture surface of the Failed Specimen with respect to pitting characteristics, crack propagation and corrosion product. Load vs. cycles to failure was measured and S/N curves were generated for the UFG Al–Mg based alloy and the conventional counterpart 5083 in air and seawater.
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pitting and stress corrosion cracking susceptibility of nanostructured al mg alloys in natural and artificial environments
Journal of Materials Engineering and Performance, 2008Co-Authors: Mala M. Sharma, Constance W ZiemianAbstract:The stress corrosion cracking (SCC) behavior of two developmental nanocrystalline 5083 alloys with varied composition and processing conditions was studied. The results were compared to a commercial aluminum AA 5083 (H111) alloy. The pitting densities, size and depths, and residual tensile strengths were measured after alternate immersion in artificial seawater and atmospheric exposure under different loading conditions. Optical and scanning electron microscopy (SEM) with EDX was used to analyze the fracture surfaces of Failed Specimen after removal at selected intervals and tensile testing. One of the nanostructured Al-Mg alloys exhibited significantly superior pitting resistance when compared to conventional microstructured AA 5083. Under conditions where pitting corrosion showed up as local tunnels toward phase inclusions, transgranular cracking was observed, whereas under conditions when pitting corrosion evolved along grain boundaries, intergranular cracking inside the pit was observed. Pit initiation resistance of the nano alloys appears to be better than that of the conventional alloys. However, long-term pit propagation is a concern and warrants further study. The objective of this investigation was to obtain information regarding the role that ultra-fine microstructures play in their degradation in marine environments and to provide insight into the corrosion mechanisms and damage processes of these alloys.
Constance W Ziemian - One of the best experts on this subject based on the ideXlab platform.
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pitting and stress corrosion cracking susceptibility of nanostructured al mg alloys in natural and artificial environments
Journal of Materials Engineering and Performance, 2008Co-Authors: Mala M. Sharma, Constance W ZiemianAbstract:The stress corrosion cracking (SCC) behavior of two developmental nanocrystalline 5083 alloys with varied composition and processing conditions was studied. The results were compared to a commercial aluminum AA 5083 (H111) alloy. The pitting densities, size and depths, and residual tensile strengths were measured after alternate immersion in artificial seawater and atmospheric exposure under different loading conditions. Optical and scanning electron microscopy (SEM) with EDX was used to analyze the fracture surfaces of Failed Specimen after removal at selected intervals and tensile testing. One of the nanostructured Al-Mg alloys exhibited significantly superior pitting resistance when compared to conventional microstructured AA 5083. Under conditions where pitting corrosion showed up as local tunnels toward phase inclusions, transgranular cracking was observed, whereas under conditions when pitting corrosion evolved along grain boundaries, intergranular cracking inside the pit was observed. Pit initiation resistance of the nano alloys appears to be better than that of the conventional alloys. However, long-term pit propagation is a concern and warrants further study. The objective of this investigation was to obtain information regarding the role that ultra-fine microstructures play in their degradation in marine environments and to provide insight into the corrosion mechanisms and damage processes of these alloys.
Jeffrey Parks - One of the best experts on this subject based on the ideXlab platform.
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A Microscopic Study on the Corrosion Fatigue of Ultra-Fine Grained and Conventional Al–Mg Alloy
Corrosion Science, 2015Co-Authors: Mala M. Sharma, Josh D. Tomedi, Jeffrey ParksAbstract:The corrosion behavior of a nanocrystalline (NC)/ultrafine grained (UFG) Al–Mg based alloy was investigated and compared to its conventional counterpart 5083(H111). The corrosion fatigue (CF) was studied with respect to pit initiation, pit location and crack propagation as a function of environment. Scanning electron microscopy (SEM) with EDS was used to analyze the fracture surface of the Failed Specimen with respect to pitting characteristics, crack propagation and corrosion product. Load vs. cycles to failure was measured and S/N curves were generated for the UFG Al–Mg based alloy and the conventional counterpart 5083 in air and seawater.
Josh D. Tomedi - One of the best experts on this subject based on the ideXlab platform.
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A Microscopic Study on the Corrosion Fatigue of Ultra-Fine Grained and Conventional Al–Mg Alloy
Corrosion Science, 2015Co-Authors: Mala M. Sharma, Josh D. Tomedi, Jeffrey ParksAbstract:The corrosion behavior of a nanocrystalline (NC)/ultrafine grained (UFG) Al–Mg based alloy was investigated and compared to its conventional counterpart 5083(H111). The corrosion fatigue (CF) was studied with respect to pit initiation, pit location and crack propagation as a function of environment. Scanning electron microscopy (SEM) with EDS was used to analyze the fracture surface of the Failed Specimen with respect to pitting characteristics, crack propagation and corrosion product. Load vs. cycles to failure was measured and S/N curves were generated for the UFG Al–Mg based alloy and the conventional counterpart 5083 in air and seawater.
Brijes Mishra - One of the best experts on this subject based on the ideXlab platform.
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Numerical Simulation of the Relaxation Behavior of Failed Sandstone Specimens
Mining Metallurgy & Exploration, 2020Co-Authors: Brijes MishraAbstract:The relaxation test on sandstone Specimens showed typical behavior in pre-failure region and stepwise behavior in the post-failure region. Overall, more significant stress relaxation occurred within the Failed Specimens than the intact ones. Numerical simulations were conducted with pre-defined failure plane and with Voronoi tessellation to visualize the relaxation behavior. The model with pre-defined failure plane showed the key role of failure plane and asperity in simulating the step-wise post-failure relaxation behavior. The inhomogeneous stress distribution within Failed Specimen and the viscous deformation of intact rocks induced high stress concentration at the asperities. The observed step-wise relaxation initiated from the failure of asperity. Furthermore, the simulations with Voronoi tessellation showed time-dependent fracture development during relaxation in post-failure region. The presence of fractures completely changed the stress distribution. Stress concentration occurred at the front area of fractures and at the interacting areas between fractures. During relaxation, fractures still developed with time and the sudden significant increase in the “damage” coincided with the acceleration of stress relaxation leading to step-wise relaxation. Finally, the results showed the possibility of using residual strength as the long-term strength of Failed rock.
