Stacking Faults
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Effects of Cold Rolling Deformation on Microstructure and Damping Capacity of a Fe-Mn-Cr-Co-Si Alloy
The microstructure evolution of Fe-19Mn-8Cr-1Co-0.2Si (wt.%) alloy and Fe-19Mn (wt.%) alloy during cold rolling and its effect on the damping capacity of the two alloys were investigated. It was shown that the damping capacity of the two alloys was enhanced significantly owing to the deformation-induced ε-martensite and stacking faults. The Fe-19Mn-8Cr-1Co-
Mat. Res.. Publicado em: 11/07/2019
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2. Mechanical Properties and Microstructural Evolution of CuZn Alloys via Pre-Torsional Deformation
Mechanical properties and microstructural evolution of Cu-10wt.%Zn and Cu-30wt.%Zn alloys after pre-torsional deformation have been investigated in this study. The results indicated that pre-torsional deformation can significantly enhance the strength of both Cu-10wt.%Zn and Cu-30wt.%Zn alloys without changing their shape and size, but with the sacrifice of
Mat. Res.. Publicado em: 18/04/2019
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3. The Microstructure and Mechanical Properties of As-cast Mg-10Gd-3Y-xZn-0.6Zr (x = 0, 0.5, 1 and 2 wt%) Alloys
The microstructure, mechanical properties and fracture behavior of as-cast Mg-10Gd-3Y-xZn-0.6Zr (x = 0, 0.5, 1 and 2 wt%) alloys have been investigated by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM) and tensile tests. The experimental results reveal that the microstructure of the alloy without Zn contains α-Mg and Mg
Mat. Res.. Publicado em: 21/06/2018
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4. Microstructural analysis in the Fe-30.5Mn-8.0Al-1.2C and Fe-30.5Mn-2.1Al-1.2C steels upon cold rolling
Abstract Electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI) were used to examine microstructural changes of the austenitic low-density Fe-30.5Mn-8.0Al-1.2C (8Al) and Fe-30.5Mn-2.1Al-1.2C (2Al) (wt.%) steels during cold rolling. As the strain increased, deformation mechanisms, such as stacking faults, slip, mechanical twin
Rem: Rev. Esc. Minas. Publicado em: 2016-06
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5. Effect of cooling rate on (ε, α') martensite formation in twinning/transformation-induced plasticity Fe-17Mn-0.06C steel
The cooling rate, density of stacking faults, austenite grain size, and temperature strongly influence the γfcc → εhcp → a'bcc martensite transformation in austenitic alloys. During cooling, austenitic Fe-Mn steels can partially transform to ε and α'martensites within a restricted chemical composition. Martensite formation will influence the mechanic
Mat. Res.. Publicado em: 02/08/2013
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6. Deformation and fracture of an alpha/beta titanium alloy
Titanium alloys are used in the aero-spatial, energy and biomaterial industries among others and exhibit high specific strength and fracture toughness. Their mechanical properties show a strong dependence on the microstructure, especially on the size and morphology of the constituent phases. An experimental evaluation was done to a better understanding of th
Matéria (Rio de Janeiro). Publicado em: 2010
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7. Aplicação de sistemas multi-classificadores no diagnóstico de falhas em motores de indução trifásicos
A manutenção de equipamentos é um dos principais fatores de custo no ambiente industrial, sendo de fundamental importância o desenvolvimento de técnicas de prevenção de falhas. Os motores de indução trifásicos são os equipamentos elétricos mais utilizados na industria, pois apresentam um baixo custo e boa robustez, entretanto, não estão imunes
Publicado em: 2009
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8. Estudos de dinamica molecular aplicados ao crescimento epitaxial e nanoindexação / Studie pf molecular dynamics applied to the epitaxial growth and nanoindentation
In this work we present two important and current subjects:Metalic thin .lms and nanoindentation. We studied these systems using molecular dynamics with empirical potentials. We showed that it is possible to model the epitaxial growth using a suitable potential and a specific methodology for deposition.Concerning the growth of thin films,we studied three sys
Publicado em: 2009
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9. Estudo de vacâncias e falhas de empilhamento em ZnO Wurtzita / Estudo de vacâncias e falhas de empilhamento em ZnO Wurtzita
Utilizando cálculos ab initio na metodologia DFT e pseudo-potencial de norma conservada, estudamos as propriedades estruturais e eletrônicas do ZnO. Investigamos as energias de formação e a estrutura eletrônica de vacâncias no cristal de ZnO. Calculamos vacâncias de oxigênio e Zn como defeitos pontuais e falhas de empilhamento que são defeitos plana
Publicado em: 2006
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10. Atomic force microscopy captures quantized plastic deformation in gold nanowires
Scanning probe microscopy has become a powerful tool to detect structural changes in small clusters of atoms. Herein, we use an atomic force microscope to measure the length of gold nanowire structures during extension and compression cycles. We have found that nanowires elongate under force in quantized steps of up to three integer multiples of 1.76 Å and
National Academy of Sciences.
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11. A quenchable superhard carbon phase synthesized by cold compression of carbon nanotubes
A quenchable superhard high-pressure carbon phase was synthesized by cold compression of carbon nanotubes. Carbon nanotubes were placed in a diamond anvil cell, and x-ray diffraction measurements were conducted to pressures of ≈100 GPa. A hexagonal carbon phase was formed at ≈75 GPa and preserved at room conditions. X-ray and transmission electron micros
National Academy of Sciences.