Search Results - "Hartwig, Karl T."

Correlating Prior Austenite Grain Microstructure, Microscale Deformation and Fracture of Ultra-High Strength Martensitic Steels by Zheng, Xinzhu, Ghassemi-Armaki, Hassan, Hartwig, Karl T., Srivastava, Ankit

“…Herein, we correlate the prior austenite grain (PAG) microstructure to deformation and fracture mechanisms of an ultra-high strength martensitic steel. To this…”
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Correction: Zheng et al. Correlating Prior Austenite Grain Microstructure, Microscale Deformation and Fracture of Ultra-High Strength Martensitic Steels. Metals 2021, 11, 1013 by Zheng, Xinzhu, Ghassemi-Armaki, Hassan, Hartwig, Karl T., Srivastava, Ankit

“…In the original article [...]…”
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Copper-Tantalum Metal Matrix Composites Consolidated from Powder Blends by Severe Plastic Deformation by Levin, Zachary S., Demkowicz, Michael J., Hartwig, Karl T.

“…We investigated the effectiveness of severe plastic deformation by equal channel angular extrusion (ECAE) for consolidation of metal powders into metal matrix…”
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Effects of strain localization on the corrosion behavior of ultra-fine grained aluminum alloy AA6061 by Ly, Ramatou, Hartwig, Karl T., Castaneda, Homero

“…[Display omitted] •Shear bands formed during ECAP possess a higher volume fraction of closely spaced precipitates than the matrix.•Shear bands are preferential…”
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Inverse determination of Johnson–Cook model constants of ultra-fine-grained titanium based on chip formation model and iterative gradient search by Ning, Jinqiang, Nguyen, Vinh, Huang, Yong, Hartwig, Karl T., Liang, Steven Y.

“…This paper presents an original method to inversely identify the Johnson–Cook model constants (J-C constants) of ultra-fine-grained titanium (UFG Ti) based on…”
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Insights into the electrochemical response of a partially recrystallized Al-Mg-Si alloy and its relationship to corrosion events by Ly, Ramatou, Karayan, Ahmad Ivan, Hartwig, Karl T., Castaneda, Homero

“…The degradation of ultra-fine grained aluminum alloys involves multiple localized corrosion mechanisms at once which make its understanding complex. Here we…”
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Tube equal channel angular extrusion (tECAE) of Mg–3Al–1Zn alloy by Srivastava, Abhinav, Vaughan, Matthew W., Mansoor, Bilal, Nasim, Wahaz, Barber, Robert E., Karaman, Ibrahim, Hartwig, Karl T.

“…This study describes a severe plastic deformation processing technique for tubular materials, in the interest of enhancing mechanical properties via grain…”
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Fracture in annealed and severely deformed tungsten by Levin, Zachary S., Srivastava, Ankit, Foley, David C., Hartwig, Karl T.

“…Bulk tungsten normally undergoes brittle fracture at ambient temperatures and has a brittle-to-ductile transition in the range 200–300 °C. This limits the use…”
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Response of microstructure to annealing in in situ Cu–Nb microcomposite by Deng, Liping, Wang, Bingshu, Han, Ke, Niu, Rongmei, Xiang, Hongliang, Hartwig, Karl T., Yang, Xiaofang

“…In this paper, the shape instabilities of Nb in in situ Cu–Nb microcomposite wires after exposed to different annealing treatments have been analyzed using…”
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Hardness, electrical resistivity, and modeling of in situ Cu–Nb microcomposites by Deng, Liping, Han, Ke, Hartwig, Karl T., Siegrist, Theo M., Dong, Lianyang, Sun, Zeyuan, Yang, Xiaofang, Liu, Qing

“…•Effect of interface area density on hardness was quantificationally analyzed.•A model was developed for describing the structure dimensions.•Solid solution…”
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Constitutive modeling of ultra-fine-grained titanium flow stress for machining temperature prediction by Ning, Jinqiang, Nguyen, Vinh, Huang, Yong, Hartwig, Karl T., Liang, Steven Y.

“…This work investigates the machining temperatures of ultra-fine-grained titanium (UFG Ti), prepared by equal channel angular extrusion, through analytical…”
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Design Aspects of Dual Nb-Ta Sheet Diffusion Barriers for Nb3Sn Conductors by HARTWIG, Karl T, BALACHANDRAN, Shreyas, BARBER, Robert E, PYON, Tae, GRIFFIN, Richard B

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Design Aspects of Dual Nb-Ta Sheet Diffusion Barriers for Conductors by Hartwig, Karl T, Balachandran, Shreyas, Barber, Robert E, Pyon, Tae, Griffin, Richard B

“…Tantalum (Ta) diffusion barriers used in Nb 3 Sn superconductors deform nonuniformly during wire drawing. A strategy sometimes used to mitigate this problem is…”
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Influences of Different ECAE Routes on Filament Deformation in Cu Clad Nb Composite Wires by Balachandran, Shreyas, Barber, R E, Huang, Y, Miao, H, Parrell, J A, Griffin, R B, Hartwig, Karl T

“…A strategy to obtain higher critical current density (Jc) in Nb 3 Sn conductors is to increase the Nb fraction. This can be achieved by improving the…”
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Fabrication of Tantalum Sheet for Superconductor Diffusion Barriers by Balachandran, S., Hartwig, K.T., Baars, D.C., Mathaudhu, S.N., Bieler, T.R., Pyon, T., Barber, R.E.

“…Poor deformation behavior of commercial Ta sheet used for Sn diffusion barriers in multifilamentary Nb 3 Sn superconductors leads to excessive Ta-Cu interface…”
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Minor titanium addition markedly improves the co-deformability of copper-tantalum composites by Borenstein, Charles, Butler, Brady G., Paramore, James D., Hartwig, Karl T., Demkowicz, Michael J.

“…We investigated the microstructures of equal channel angular extrusion (ECAE) processed sintered composites of copper (Cu) and tantalum (Ta). These composites…”
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Tube equal channel angular extrusion (tECAE) of Mg–3Al–1Zn alloy by Srivastava, Abhinav, Vaughan, Matthew W., Mansoor, Bilal, Nasim, Wahaz, Barber, Robert E., Karaman, Ibrahim, Hartwig, Karl T.

“…Not provided…”
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Grain refinement mechanisms and strength-hardness correlation of ultra-fine grained grade 91 steel processed by equal channel angular extrusion by Song, Miao, Sun, Cheng, Chen, Youxing, Shang, Zhongxia, Li, Jin, Fan, Zhe, Hartwig, Karl T., Zhang, Xinghang

“…Ferritic/martensitic grade 91 steel (T91 or P91) is one of the candidate materials for primary and secondary loops in sodium cooled fast reactor. Recently,…”
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Influence of dynamic recrystallization and shear banding on the localized corrosion of severely deformed Al–Mg–Si alloy by Ly, Ramatou, Hartwig, Karl T., Castaneda, Homero

“…The low intergranular corrosion resistance of extruded aluminum alloys is a limiting criteria for several applications. In this work, we investigated the…”
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Microstructure and Mechanical Properties of Heavily Worked and Recrystallized Copper for Low-Temperature Superconductor Applications by Springs, Jason C., Srivastava, Abhinav, Levin, Zach S., Barber, Robert E., Hartwig, Karl T.

“…Oxygen-free high-conductivity (OFHC) copper is generally used as a matrix for mechanical and electrical failure support of Nb3Sn superconducting filaments…”
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