The Use of High Strength Aluminium Alloys

1966 ◽  
Vol 70 (668) ◽  
pp. 763-766 ◽  
Author(s):  
D. James
Keyword(s):  
Magnesium Alloys ◽  
User Experience ◽  
Aluminium Alloys ◽  
High Strength ◽  
Static Strength ◽  
Alloying Elements ◽  
Short Term ◽  
Wide Range ◽  
German Origin

The object of this paper is to present some of the user experience with the high strength aluminium alloys. The somewhat tarnished reputation of the Aluminium-Zinc-Magnesium alloys is undoubtedly due to their premature introduction; the very substantial weight savings offered by the relatively high static strength values proving too strong an attraction at the end of the war-time era dominated by short term considerations.It will be appreciated that there is a wide range of alloys in this family. Table I lists the composition ranges of typical French, American and British specifications together with a proprietary alloy, of German origin, which is of particular interest. Manufacturers have their own favoured compositions within the permitted ranges. Fig. 1 shows diagrammatically the wide variation in percentage of the principal alloying elements zinc, magnesium and copper.

Selection and Design Principles of Wrought Aluminium Alloys for Structural Applications

2012 ◽  
Vol 710 ◽  
pp. 50-65 ◽  
Author(s):  
A.K. Mukhopadhyay
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloys ◽  
High Strength ◽  
Al Alloys ◽  
Alloy Design ◽  
Alloying Elements ◽  
Microstructure And Properties ◽  
Structural Applications ◽  
Treatment Procedures ◽  
Selection Of

This article discusses the fundamental principles associated with the selection of aluminium alloys for specific purposes, alloy design & heat treatment procedures and development of key microstructures responsible for obtaining desired properties in selected wrought Al alloys for aerospace and defence applications. Influence of micro/trace additions of suitable alloying elements on the microstructure and properties of high strength 7xxx series Al alloys is further highlighted.

LCA Study of Rare Earth Metals for Magnesium Alloy Applications

2010 ◽  
Vol 654-656 ◽  
pp. 803-806 ◽  
Author(s):  
Paul Koltun ◽  
Ambalavanar Tharumarajah
Keyword(s):  
Rare Earth ◽  
Environmental Impact ◽  
Magnesium Alloys ◽  
Aluminium Alloys ◽  
Rare Earth Metals ◽  
High Strength ◽  
Strength Properties ◽  
Low Density ◽  
Fundamental Understanding ◽  
Alternative Material

High strength properties combined with low density has made magnesium alloys a highly attractive structural material, in particular where weight savings is of concern. In air and ground transport these alloys are used as alternative material in place of heavier ferrous or aluminium alloys. In this respect, much research has been directed at developing and deploying superior magnesium alloys using rare earth elements (REEs), an example the Mg-RE (Ce, Y, Nd) alloys for drive train components. With the overall aim of ascertaining the environmental impact of employing REEs as alloying agents in producing superior Mg-RE alloys, it is paramount that a fundamental understanding of the environmental burden imparted by the extraction and production of REEs be determined. This study reports on such an assessment of REEs by conducting a detailed life cycle assessment (LCA) study of the environmental impact from mining to production of REEs.

Graded Anodic Film Morphologies for Sustainable Exploitation of Aluminium Alloys in Aerospace

2008 ◽  
Vol 38 ◽  
pp. 48-55 ◽  
Author(s):  
Michele Curioni ◽  
Peter Skeldon ◽  
George E. Thompson ◽  
John Ferguson
Keyword(s):  
Aluminium Alloys ◽  
High Strength ◽  
Alloy System ◽  
Alloying Elements ◽  
Anodic Film ◽  
Localized Corrosion ◽  
Second Phase ◽  
System A ◽  
Multiphase Alloy ◽  
Low Weight

High strength aluminium alloys are widely used in the civil and military aerospace industry due to their low weight and high mechanical properties, achieved by selected alloying elements and heat treatments. The resulting multiphase alloy system, a solid solution of alloying elements in the aluminium matrix and a variety of second phase material, requires specific anticorrosion measures in order to prevent localized corrosion, which is promoted by microgalvanic coupling between the different metallographic phases. Traditionally, the anticorrosion performances are achieved by chromic acid anodizing (CAA), followed by painting. However, environmental issues and associated costs for the disposal of chromate wastes, require the development of new approaches for anodizing of aluminium alloys. In this work, the potential for tailoring the porous anodic film morphology through the film thickness by controlled variations of the anodizing potential is inspected. The procedure developed is, in principle, applicable to any aluminium alloy in any anodizing electrolyte and results in the generation of innovative graded porous anodic film morphologies which promise improvement of anticorrosion properties and replacement of CAA .

scholarly journals Lean Wrought Magnesium Alloys

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4282
Author(s):  
Nikolaus P. Papenberg ◽  
Stefan Gneiger ◽  
Peter J. Uggowitzer ◽  
Stefan Pogatscher
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Weight Percent ◽  
Alloying Elements ◽  
Hot Forming ◽  
Biomedical Implants ◽  
Alloy Content ◽  
Characteristic Behavior ◽  
Wide Range

Lean magnesium alloys are considered attractive candidates for easy and economical hot forming. Such wrought alloys, defined here as materials with a maximum alloying content of one atomic or two weight percent, are known to achieve attractive mechanical properties despite their low alloy content. The good mechanical properties and the considerable hardening potential, combined with the ease of processing, make them attractive for manufacturers and users alike. This results in potential uses in a wide range of applications, from rolled or extruded components to temporary biomedical implants. The characteristic behavior of these alloys and the optimal use of suitable alloying elements are discussed and illustrated exemplarily.

scholarly journals Pit nucleation on as-cast aluminiuim alloy AW-5083 in 0.01M NaCl

2011 ◽  
Vol 47 (1) ◽  
pp. 79-87 ◽  
Author(s):  
N. Dolic ◽  
J. Malina ◽  
A. Begic-Hadzipasic
Keyword(s):  
Corrosion Resistance ◽  
Aluminium Alloys ◽  
High Strength ◽  
Al Alloys ◽  
Surface Oxide Layer ◽  
Good Corrosion Resistance ◽  
Weight Saving ◽  
Wide Range ◽  
Pit Nucleation ◽  
Cast Condition

The use of aluminium alloys in a wide range of technical applications is related mostly to the two facts: they facilitate weight saving of final products (if compared to the steel) and they are prone to spontaneous passivity due to the coherent surface oxide layer which impedes further reaction of aluminium with the environment. Among the commercial Al alloys, EN AW-5083 alloy is a representative non-heat treatable Al-Mg based alloy which possesses many interesting characteristics as a structural material, such as low price, moderately high strength, high formability in conjunction with superplasticity and good corrosion resistance in marine atmospheres. Aiming to enhance the knowledge of possible interactions of studied alloy EN AW-5083 in as-cast condition with chloride media, electrochemical measurements were used to follow the pitting behaviour in 0.01 M NaCl. The results of tests have shown that susceptibility of alloy to pitting corrosion is strongly influenced by the microstructural constituents of the alloy in as-cast condition.

The Atmospheric Stress-Corrosion Resistance of some Forged High Strength Aluminium Alloys and an Assessment of the Effects of a Step-Quench into Molten Salt

1959 ◽  
Vol 10 (4) ◽  
pp. 297-318 ◽  
Author(s):  
W. M. Doyle ◽  
R. G. Jones
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Aluminium Alloys ◽  
Transverse Direction ◽  
Copper Alloys ◽  
High Strength ◽  
Plate Material ◽  
Short Transverse ◽  
Wide Range ◽  
Stress Corrosion Resistance

Since the introduction of aluminium-zinc-magnesium-copper alloys, investigations into the behaviour of these high strength materials, over a wide range of composition, have indicated the significance of corrosion as a factor affecting the cracking of these alloys after prolonged stressing at loads below the ultimate tensile strength of the material.Most of the previous work designed to assess the stress-corrosion resistance of aluminium-zinc-magnesium-copper alloys (D.T.D. 683A*) was carried out on sheet and plate material and the present investigation is concerned with the examination of these materials in the form of large hand-forged slabs, tested in the short transverse direction.

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

ALCOA 7150-T7751 and T77511

Alloy Digest ◽  
2015 ◽  
Vol 64 (4) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Tensile Properties ◽  
High Strength ◽  
Static Strength ◽  
Corrosion Resistant ◽  
Overaged Condition

Abstract This producer has pioneered the development of the -T77 temper, a high strength corrosion resistant temper for Alloy 7150 plate and extrusions. Alloy 7150-T77 provides weight savings opportunities in structure governed by static strength requirements but where "overaged" condition corrosion resistance is required. This datasheet provides information on composition, tensile properties, and compressive strength. It also includes information on corrosion resistance as well as forming. Filing Code: Al-442. Producer or source: Alcoa Mill Products Inc..

FEDERATED F150.5

Alloy Digest ◽  
1975 ◽  
Vol 24 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Alloying Elements ◽  
Light Weight ◽  
Temperature Performance

Abstract FEDERATED F150.5 is a heat-treatable aluminum alloy containing silicon and copper as the major alloying elements. It is recommended for high-strength, light-weight, pressure-tight castings. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as casting, heat treating, machining, and joining. Filing Code: Al-219. Producer or source: Federated Metals Corporation, ASARCO Inc..

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