Materials Science and Engineering: A

2000

DOI: 10.1016/s0921-5093(99)00543-2

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Microstructural and mechanical characterization of a superplastic 6xxx aluminum alloy

Lillianne P. Troeger

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Materials and Samples1

Properties Of Aa6xxx Alloys1

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Cited by 185 publications

(55 citation statements)

References 13 publications

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“…While there has been significant progress in thermomechanical processing to optimize the physical and mechanical properties of ultrafine-grained (UFG) 2xxx and 7xxx grades of Al alloys in the 1980s, [1][2][3] it is only recently that the focus has shifted to the 6xxx series Al alloys. [4][5][6][7] This is in spite of the fact that the 6xxx Al alloys are in wide use due to their superior corrosion resistance and low cost, along with good formability and weldability. [8] It is now realized that a better understanding of strengthening and flow properties of the Al alloys of the 6xxx series, by manipulating the precipitation and grain refinement processes, can enable more effective exploitation of these important alloys.…”

mentioning

confidence: 99%

Plastic Flow Properties and Microstructural Evolution in an Ultrafine-Grained Al-Mg-Si Alloy at Elevated Temperatures

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et al. 2009

Metall Mater Trans A

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An AA6082 alloy was subjected to eight passes of equal channel angular pressing at 100°C, resulting in an ultrafine grain size of 0.2 to 0.4 lm. The tensile deformation behavior of the material was studied over the temperature range of 100°C to 350°C and strain rate range of 10 À4 to 10 À1 s À1 . The evolution of microstructure under tensile deformation was investigated by analyzing both the deformation relief on the specimen surface and the dislocation structure. While extensive microshear banding was found at the lower temperatures of 100°C to 150°C, deformation at higher temperatures was characterized by cooperative grain boundary sliding and the development of a bimodal microstructure. Dislocation glide was identified as the main deformation mechanism within coarse grains, whereas no dislocation activity was apparent in the ultrafine grains.

“…While there has been significant progress in thermomechanical processing to optimize the physical and mechanical properties of ultrafine-grained (UFG) 2xxx and 7xxx grades of Al alloys in the 1980s, [1][2][3] it is only recently that the focus has shifted to the 6xxx series Al alloys. [4][5][6][7] This is in spite of the fact that the 6xxx Al alloys are in wide use due to their superior corrosion resistance and low cost, along with good formability and weldability. [8] It is now realized that a better understanding of strengthening and flow properties of the Al alloys of the 6xxx series, by manipulating the precipitation and grain refinement processes, can enable more effective exploitation of these important alloys.…”

mentioning

confidence: 99%

Plastic Flow Properties and Microstructural Evolution in an Ultrafine-Grained Al-Mg-Si Alloy at Elevated Temperatures

¹

,

²

,

³

et al. 2009

Metall Mater Trans A

View full text Add to dashboard Cite

An AA6082 alloy was subjected to eight passes of equal channel angular pressing at 100°C, resulting in an ultrafine grain size of 0.2 to 0.4 lm. The tensile deformation behavior of the material was studied over the temperature range of 100°C to 350°C and strain rate range of 10 À4 to 10 À1 s À1 . The evolution of microstructure under tensile deformation was investigated by analyzing both the deformation relief on the specimen surface and the dislocation structure. While extensive microshear banding was found at the lower temperatures of 100°C to 150°C, deformation at higher temperatures was characterized by cooperative grain boundary sliding and the development of a bimodal microstructure. Dislocation glide was identified as the main deformation mechanism within coarse grains, whereas no dislocation activity was apparent in the ultrafine grains.

“…The compression strength and resistance to fatigue are the critical parameters in aircraft skin, wing, and empennage element design. The high strength of 7075-T6 aluminum alloy is key in using this material in aircraft structures based on its strength to weight ratio, machinability, and relative low cost [7,26].…”

Section: Materials and Samplesmentioning

confidence: 99%

The effect of tool wear on the quality of lap joints between 7075 t6 aluminum alloy sheet metal created with the FSW method

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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The article concerns the issues of tool wear effect on the quality of a friction stir welding joint quality. The experiment used aluminum alloy 7075 T6 sheet metal, which is used primarily in the aerospace industry. 1.0mm and 0.8mm thick lap joints were tested. Tool wear was determined based on multiple readings on a multisensory machine. The tool wear evaluation was done on the basis of a static tensile strength test and metallographic sections of the joints. The pin of the tool works in more demanding conditions and is more exposed to friction. This results from tooling operations performed at full depth dive in the jointed material. When also considering the small dimensions of the pin such as the diameter and the great forces occurring in this process, it is easy to see why this element is most susceptible to tool wear. The welding process causes the tool to undergo friction wear, which is the cause of reduced tool dive depth in the jointed material. As a result, it is paramount to constantly control the tool extension to achieve the desired quality parameters of the joint. After creating 200m of joints, a decrease in the strength of joints was observed as well as the repeatability of the results connected to a change in the stirring conditions in the material. The change in joint strength and tool wear is also confirmed in the metallographic analysis, which states that the continued degradation of the tool makes it subject to a decrease in size of the characteristic sizes of the thermoplastic zone that is the main determining factor of the joint strength.

“…The properties of AA6XXX alloys vary with composition and processing such as hot working, cold working, annealing, and aging processes [2,5,7,69,70]. Yield strength, ultimate tensile strength, elongation, shear strength, fracture strength, and hardness values for the annealed state and T6 state of some widely used AA6XXX alloys are tabulated in Table 10 and Table 11 [7].…”

Section: Properties Of Aa6xxx Alloysmentioning

confidence: 99%

Alloy Designation, Processing, and Use of AA6XXX Series Aluminium Alloys

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2012

ISRN Metallurgy

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The strength-to-weight ratio offered by AA6XXX alloys and their enhanced mechanical properties have become crucial criteria for their use in light weight military vehicles, rockets, missiles, aircrafts, and cars, used for both defence and civil purpose. The focus of this review paper is to put together the latest knowledge available from various sources on alloy design, industrial processing, development of properties, and potential use of AA6XXX alloys. The direct chill (DC) cast AA6XXX wrought alloys which are subsequently processed by fabrication process like hot working, cold working, process annealing, and age hardening heat treatments are the foci of this review though designation section also contains the designations of cast alloys to provide the reader a broad overview on designation. World-wide accepted designations are briefly tabled along with their alloying elements. The effects of the alloying elements which are generally used for AA6XXX wrought alloys are discussed incorporating their interactions during wrought AA6XXX alloy fabrication. The significance of the alloying and also the processing to develop the certain properties and the underlying strengthening mechanisms are discussed. The frequent and versatile uses of these AA6XXX alloys for the structural applications both in defence and civil purpose are put forth.

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