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 .

MP 35N ALLOY

Alloy Digest ◽  
1991 ◽  
Vol 40 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Base Alloy ◽  
High Strength ◽  
Alloy System ◽  
Unique Combination ◽  
Temperature Performance ◽  
Nickel Cobalt ◽  
Multiphase Alloy ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Abstract MP35N Alloy is a nickel-cobalt base alloy of the MULTIPHASE alloy system. It possesses a unique combination of properties-ultra high strength, toughness, ductility and outstanding corrosion resistance. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness and fatigue. It also includes information on low and high temperature performance, and corrosion resistance. Filing Code: Co-61. Producer or source: Amax Specialty Metals Corporation. Originally published as MP 35N Multiphase, July 1970, revised February 1991.

scholarly journals A Review on Laser-Assisted Joining of Aluminium Alloys to Other Metals

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1680
Author(s):  
Ivan Bunaziv ◽  
Odd M. Akselsen ◽  
Xiaobo Ren ◽  
Bård Nyhus ◽  
Magnus Eriksson ◽  
...  
Keyword(s):  
Laser Beam ◽  
Aluminium Alloys ◽  
Thermal Cycle ◽  
High Strength ◽  
High Concentration ◽  
High Demand ◽  
High Corrosion Resistance ◽  
Hybrid Processes ◽  
Low Weight ◽  
Lower Heat

Modern industry requires different advanced metallic alloys with specific properties since conventional steels cannot cover all requirements. Aluminium alloys are becoming more popular, due to their low weight, high corrosion resistance, and relatively high strength. They possess respectable electrical conductivity, and their application extends to the energy sector. There is a high demand in joining aluminium alloys with other metals, such as steels, copper, and titanium. The joining of two or more metals is challenging, due to formation of the intermetallic compound (IMC) layer with excessive brittleness. High differences in the thermophysical properties cause distortions, cracking, improper dilution, and numerous weld imperfections, having an adverse effect on strength. Laser beam as a high concentration energy source is an alternative welding method for highly conductive metals, with significant improvement in productivity, compared to conventional joining processes. It may provide lower heat input and reduce the thickness of the IMC layer. The laser beam can be combined with arc-forming hybrid processes for wider control over thermal cycle. Apart from the IMC layer thickness, there are many other factors that have a strong effect on the weld integrity; their optimisation and innovation is a key to successfully delivering high-quality joints.

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.

Development of New Wrought Mg Alloys: Improving the Corrosion Resistance by Addition of Alloying Elements

2020 ◽  
Vol 27 ◽  
pp. 50-60
Author(s):  
Guy Ben Hamu ◽  
Polina Metalnikov
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Oxide Layer ◽  
Weight Ratio ◽  
High Strength ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Second Phase ◽  
Second Phase Particles ◽  
Superior Corrosion Resistance

Magnesium (Mg) alloys constitute an attractive structural material for transportation industries, due to their low density and high strength/weight ratio. However, high susceptibility to corrosion of Mg alloys limits their use. Therefore, there is a growing interest for development of new Mg alloys with good mechanical properties and superior corrosion resistance. Production of wrought Mg alloys results in enhancement of mechanical properties, whereas addition of alloying elements may result in improved corrosion behavior. In this study we distinguish the role of aluminum, zinc, tin and calcium additions on the corrosion performance of new wrought Mg alloys. Overall, addition of alloying elements resulted in precipitation of second phase particles with cathodic behavior (relatively to Mg matrix). This enhanced the micro-galvanic effects and the corrosion resistance in short periods of immersion was deteriorated. However, in longer periods of immersion the passive characteristics of the oxide layer played a significant role in improving the alloys' corrosion resistance. The contribution of each element to the oxide layer will be discussed in detail. In general, the quantities of alloying element should be sufficient to stabilize the corrosion products layer; yet as low as possible, in order to reduce the micro-galvanic effects.

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.

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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