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3 results on '"Pure Al"'

1. On the Estimation of True Hall-Petch Constants and Their Role on the Superposition Law Exponent in Al Alloys

Author

Shanmugasundaram Thangaraju, Martin Heilmaier, Subramanya Sarma Vadlamani, and B.S. Murty

Subjects
Cerium alloys, Materials science, Strengthening mechanisms, Condensed matter physics, Strength values, Metallurgy, Superposition law, Pure Al, Flow stress, Hall-petch, Condensed Matter Physics, Grain size, Aluminum alloys, Al alloys, Superposition principle, Lattice (order), Critical resolved shear stress, Hardening (metallurgy), Exponent, General Materials Science, Grain size and shape, Strengthening mechanisms of materials, Grain-size strengthening, Linear superpositions, Grain boundary strengthening
Abstract

Hall-Petch (HP) relation and the superposition of different strengthening mechanisms in different aluminum alloys with grain sizes in the range of 50 nm-70 ?m were analyzed. HP parameters as high as ? 0 ? 200 MPa and k HP ? 0.14 MPa m 1/2 were observed when the HP relation was fitted directly using the experimentally measured yield strength values. In contrast, considering only the grain size strengthening (by subtracting other strengthening contributions), HP constants of ? 0 ? 10 MPa and k HP ? 0.06 MPa m 1/2 were obtained over wide range of grain sizes for the case of a linear superposition of the various strengthening mechanisms present. This is in excellent accord with the values obtained for pure Al justifying the chosen superposition exponent of n equal unity for the different alloys investigated. Copyright � 2012 WILEY-VCH Verlag GmbH &amp, Co. KGaA, Weinheim.

Published
2012

2. On the Hall–Petch relationship in a nanostructured Al–Cu alloy

Author

B.S. Murty, V. Subramanya Sarma, Martin Heilmaier, and T. Shanmugasundaram

Subjects
Materials science, Friction, Alloy, Mechanical properties, Pure Al, Al-Cu alloys, engineering.material, Hall-petch, Hot pressing, Frictional stress, Copper alloys, Cu precipitates, Vacuum hot pressing, General Materials Science, Hall-Petch relation, Strengthening mechanisms of materials, Nanocrystallines, Grain boundary strengthening, Cerium alloys, Nano-structured, Strengthening mechanisms, Mechanical Engineering, Metallurgy, Nanostructured materials, Condensed Matter Physics, Microstructure, Grain size, Aluminum alloys, Nanocrystalline material, Mechanically alloying, Nanocrystalline alloys, Mechanics of Materials, Hardening (metallurgy), engineering, Hall Petch relationship, Mechanical alloying, Cu alloy, Oxide particles, Aluminum
Abstract

Mechanical properties of bulk nanocrystalline Al–4Cu alloys with grain sizes from 47 to 105 nm, synthesized by mechanically alloying followed by vacuum hot pressing at different temperatures, were analysed through Hall–Petch relation. Hall–Petch analysis revealed a high frictional stress (170 MPa) and a high positive slope ( 0.13 MPa m ) as compared to pure Al, which has a frictional stress (15–30 MPa) and a slope ( 0.06 – 0.09 MPa m ). From a detailed evaluation of different strengthening mechanisms it is inferred that the Al 2 Cu precipitates and oxide particles are the likely reason for such high values of frictional stress and slope.

Published
2010

3. EFFECT OF DEFORMATION ON DENSIFICATION AND CORROSION BEHAVIOR OF Al-ZrB2 COMPOSITE

Author

Asit Kumar Khanra, Sai Mahesh Yadav Kaku, and M. J. Davidson

Subjects
lcsh:TN1-997, Controlled atmosphere, Materials science, Composite number, chemistry.chemical_element, 02 engineering and technology, Pure Al, potentio-dynamic polarization, Al-ZrB2 composites, 01 natural sciences, Corrosion, Metal, Aluminium, densification, 0103 physical sciences, Relative density, Composite material, Polarization (electrochemistry), Powder mixture, lcsh:Mining engineering. Metallurgy, 010302 applied physics, Mechanical Engineering, Metals and Alloys, deformation, 021001 nanoscience & nanotechnology, hardness, chemistry, visual_art, visual_art.visual_art_medium, 0210 nano-technology
Abstract

In the present investigation, aluminium based metal matrix composites (MMCs) were produced through powder metallurgical route. Different composites were processed by adding different amount of ZrB2 (0, 2, 4 and 6 wt. %) at three aspect ratios of 0.35, 0.5, and 0.65, respectively. The powder mixture was compacted and pressureless sintered at 550 °C for 1 h in controlled atmosphere (argon gas). The relative density of the sintered preforms was found to be 90%, approximately. Sintered preforms are used as workpiece materials for deformation study at different temperatures in order to find the effect of temperature on the densification behaviour. Potentio-dynamic polarization studies were performed on the deformed preforms to find the effect of mechanical working. The corrosion rate was found to decrease with increase in deformation.

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