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Aluminum alloys with a target Zn-wt% of 0, 1, 10, 30 and 60 have been cast and prepared for rolling. Each cast will have samples rolled to 75% and 90% elongation. The samples have been scanned with an x-ray diffractometer in order to obtain a measurement of the bulk alloy texture. An orientation distribution function has been calculated using the n...
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Context 1
... melts were measured with a thermocouple and poured into a steel mold covered in graphite spray. The pouring temperatures determined from the phase diagram in Figure 3 are displayed in Table 3. The aluminum in the first casting (pure Al) was heated up to 745 o C, then the grain refiner was added in one solid chunk. ...
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... as the additional zinc content is added to the alloys, there is still a pronounced density of the Copper type orientation, but its magnitude is distributed along the tertiary textures surrounding its peak. In comparison to the Hirsch and Lücke paper, this Copper texture component transformation is seen with the addition of zinc, particularly between pure copper and 95:5 brass, which is seen in Figure 13 [1]. Figure 10 starts shows the disappearance of the Copper texture component at 60 o from the vertical axis at 90% reduction. This behavior seems to correspond to the 95% strained 95:5 brass sample in Figure 13. ...
Context 3
... 10 starts shows the disappearance of the Copper texture component at 60 o from the vertical axis at 90% reduction. This behavior seems to correspond to the 95% strained 95:5 brass sample in Figure 13. The decrease in the Copper texture components in both the 90% and 75% compressed samples (seen in Figures 11 and 12) corresponds to the β fiber values measured in the Cu-Zn alloys at the same levels of compression (seen in Figures 14 and 15 [1]). ...
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Analysis of dislocation density in metallic materials has been pursued with great interest for many years because dislocations are closely associated with plastic deformation and thus exert a deep effect on the mechanical properties of any material. Crystallographic texture has also a decisive influence in some properties. In this work, the disloca...
Citations
... Para compreender a maneira como o alumínio influencia uma liga de zinco, é importante entender o diagrama de fases binário Zn-Al (vide Figura 4). (Merkley, 2016). (Porter, 1994). ...
Isabella Esparre Duchêne. Viabilidade técnica do uso de ligas hipoeutéticas de zinco na produção de moldes permanentes para injeção de polímeros. Trabalho de Conclusão de Curso. Departamento de Engenharia Metalúrgica e de Materiais, Escola Politécnica, Universidade de São Paulo, 70 p., 2020 Orientação: Prof. Cesar R. F. Azevedo
This study proposes the design and implementation of high-entropy alloy (HEA) thin films as materials for the reflector of deep ultraviolet light-emitting devices and marks the first application of HEA in optical field. In the material design phase, an Al-Co-Zn-Ni alloy is designed by considering the reflectivity, phase stability and binary formation energy. Reverse Monte Carlo calculation is employed to establish stable atomic structure. Frequency-dependent dielectric equations are derived from first principles calculations, with dielectric constants incorporating contributions from ions and electrons and combining classical Drude and Lorentz models. The dielectric equations yield optical constants that are used to calculate the reflectance. In the experimental phase, we systematically vary the aluminum content and prepare Al-Co-Zn-Ni thin films ranging from pure aluminum to equimolar compositions. In the deep ultraviolet region, the reflectance of thermally treated Al65Zn12Co12Ni11 and Al50Zn16Co17Ni17 thin films is found superior to that of gold by three times. Structural and crystalline changes with varying aluminum content are found, as well as intriguing phase separation and superlattice formation that persist until equimolar compositions. This unique nanoscale structural variation causes the Young's modulus and hardness of Al-Co-Zn-Ni thin films to initially increase and then decrease with decreasing aluminum content. There is a significant increase in the corrosion potential difference when reducing Al contents in Al-Co-Zn-Ni, indicating improved passivation effects as the equimolar composition is approached. By modulating the aluminum content, the nanoscale structure of Al-Co-Zn-Ni can be adjusted, thereby improving its optical, mechanical, corrosion resistance, and thermal stability properties. This demonstrates the high versatility of this material for practical optical applications.
