A Method to Calculate the Resistivity of Strip Cast 3000 Series Al Alloys Based on Their Nominal Solute Content

1987 ◽  
pp. 271-279 ◽  
Author(s):  
Omar S. Es-Said ◽  
J. G. Morris
Keyword(s):  
Al Alloys ◽  
Solute Content ◽  
Strip Cast

Substructure of Cu and Cu Al Alloys Following Explosive Shock Deformation at One Megabar Pressure

1970 ◽  
Vol 28 ◽  
pp. 422-423 ◽  
Author(s):  
S. V. Hooker ◽  
J. V. Foltz ◽  
F. I. Grace
Keyword(s):  
Deformation Behavior ◽  
Shock Loading ◽  
Al Alloys ◽  
Water Tank ◽  
Defect Structures ◽  
Wave Loading ◽  
Solute Content ◽  
The Past ◽  
Shock Deformation ◽  
Planar Wave

In the past decade electron microscopy has proven a most valuable tool for studies of microstructural changes in materials due to planar wave shock loading. Although the nature of the defect structures as a function of solute content has been investigated rather thoroughly for many alloys for pressures up to 500 kbar, and a few studies for specific metals have been reported for pressures in the megabar range, to date no systematic study has been carried out for alloys of a particular family shock loaded to a pressure of one megabar. In this paper we examine the shock deformation behavior of Cu, Cu95 Al5, and Cu89 Al11 solid solutions for a pressure of one megabar. For producing a planar wave loading situation the explosive assembly of McQueen and Marsh was duplicated.1 Annealed specimens were placed in foil form in a sandwich arrangement and simultaneously shock loaded. A water tank was used for recovery purposes.

Solute Content and the Tensile Behavior of High Pressure Die Cast Mg-Al Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 333-336 ◽  
Author(s):  
A.V. Nagasekhar ◽  
Carlos H. Cáceres
Keyword(s):  
Volume Fraction ◽  
Cell Structure ◽  
Al Alloys ◽  
Core Region ◽  
Aluminium Content ◽  
Solute Content ◽  
The Core ◽  
Β Phase ◽  
Intermetallic Particles ◽  
Phase Intermetallic

Binary Mg-Al alloys with varying content of aluminium from 0.5 to 12mass% have been studied. The proof stress increase in two steps whereas the ductility exhibits two correlated stepwise drops, as the aluminium content increases. The first increase in strength, and attendant drop in ductility, is observed between 4 and 5 mass% Al. The second stepwise change is observed between 10 and 12 mass% Al. These effects are connected with well defined changes in the microstructure: at 4 mass% a dispersion of β-phase intermetallic particles appears in the core region and a closed cell structure develops near the surface; at 12 mass% Al, the increased volume fraction of the β- phase intermetallics extends the interconnected network of intermetallics to include the core region as well. The micromechanics of the strengthening and decreased ductility are discussed.

Evolution of as-Cast Microstructure of Mg-Al Alloys with Solute Content and Cooling Rate

2011 ◽  
Vol 409 ◽  
pp. 362-367 ◽  
Author(s):  
M. Paliwal ◽  
Dae H. Kang ◽  
Elhachmi Essadiqi ◽  
In Ho Jung
Keyword(s):  
Cooling Rate ◽  
Phase Formation ◽  
Microstructural Evolution ◽  
Al Alloys ◽  
Second Phase ◽  
Solute Content ◽  
Rate Range ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Cast Microstructure

Although numerous solidification experiments have been conducted for Al, Cu and Si alloys to investigate microstructural features like primary and secondary dendrite arm spacing, solute distribution with in secondary arms and second phase fraction, no systematic solidification study on Mg alloys has been performed to understand the evolution of microstructural features as a function of cooling rate and solute content. The present study focuses on the experimental microstructural evolution of Mg-3, 6 and 9 wt. % Al alloys in the cooling rate range of 1 K/sec to 1000 K/sec. The results suggest that secondary dendrite arm spacing and amount of second phase formation are strongly dependent on both solute content and cooling rate.

Melt Conditioned Twin Roll Casting (MC-TRC) for Aluminium Alloys

2014 ◽  
Vol 794-796 ◽  
pp. 1115-1120 ◽  
Author(s):  
Nilam S. Barekar ◽  
Sanjeev Das ◽  
Zhong Yun Fan
Keyword(s):  
Mechanical Performance ◽  
Downstream Processing ◽  
Al Alloys ◽  
Al Alloy ◽  
Solute Content ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Wide Range ◽  
Twin Roll

Twin roll casting (TRC) has been demonstrated to be an effective route for producing Al sheet at a reduced cost. However, the quality of the Al alloys sheets produced by the TRC process is limited by the formation of centreline segregation, which hampers the downstream processing, degrade the mechanical performance of the final rolled products, limit TRC to dilute alloys with a narrow freezing range, and hence prevent its application in a wide range of engineering sectors. To improve the quality of the TRC strips, a new technology, melt conditioning twin roll casting (MC-TRC) has been developed. It has been demonstrated that the MC-TRC process is capable of producing Al-alloy strips with minimal centerline segregation which is attributed to enhanced nucleation by well dispersed naturally occurring oxides in liquid Al alloys. This work aims to investigate the upper composition limit allowed for the MC-TRC process using the binary Al-Mg alloys as model alloys. The results showed that melt conditioning increases the range of alloys (solute content up to 7%) that can be twin roll cast without severe segregation.

Moire Fringes on Precipitates in Quenched and Aged Beryllium

1968 ◽  
Vol 26 ◽  
pp. 426-427
Author(s):  
F. J. Fraikor ◽  
A. W. Brewer
Keyword(s):  
Ternary Phase ◽  
Volume Fraction ◽  
Age Hardening ◽  
Orientation Relationships ◽  
Solute Content ◽  
Moiré Fringes ◽  
Moire Patterns ◽  
Total Volume Fraction ◽  
Diffraction Patterns ◽  
Moiré Patterns

A number of investigators have examined moire patterns on precipitate particles in various age-hardening alloys. For example, Phillips has analyzed moire fringes at cobalt precipitates in copper and Von Heimendahl has reported on moire fringes in the system Al-Au. Recently, we have observed moire patterns on impurity precipitates in beryllium quenched in brine from 1000°C and aged at various temperatures in the range of 500-800°C. This heat treatment of beryllium rolled from vacuum cast ingots produces the precipitation of both an fee ternary phase, AlFeBe4, and an hcp binary phase, FeBe11. However, unlike a typical age-hardening alloy, the solute content of this material is low (less than 1000 ppm of Fe and 600 ppm of Al) and hence the total volume fraction of precipitates is small. Therefore there is some difficulty in distinguishing the precipitates and their orientation relationships with the beryllium matrix since the weak precipitate spots generally do not appear on the diffraction patterns.

Observation of faint contrast at planar faults in alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 340-341
Author(s):  
K. Kuroda ◽  
Y. Tomokiyo ◽  
T. Kumano ◽  
T. Eguchi
Keyword(s):  
Reciprocal Lattice ◽  
Beam Theory ◽  
Al Alloys ◽  
Small Displacement ◽  
Electron Microscopic ◽  
Lattice Vector ◽  
Fringe Contrast ◽  
Planar Fault ◽  
Lattice Displacement ◽  
The Many

The contrast in electron microscopic images of planar faults in a crystal is characterized by a phase factor , where is the reciprocal lattice vector of the operating reflection, and the lattice displacement due to the fault under consideration. Within the two-beam theory a planar fault with an integer value of is invisible, but a detectable contrast is expected when the many-beam dynamical effect is not negligibly small. A weak fringe contrast is also expected when differs slightly from an integer owing to an additional small displacement of the lattice across the fault. These faint contrasts are termed as many-beam contrasts in the former case, and as ε fringe contrasts in the latter. In the present work stacking faults in Cu-Al alloys and antiphase boundaries (APB) in CuZn, FeCo and Fe-Al alloys were observed under such conditions as mentioned above, and the results were compared with the image profiles of the faults calculated in the systematic ten-beam approximation.

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

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