Temperature and Strain Rate Effects on the Dynamic Strain Ageing of Aluminium Alloy AA7030

Hörnqvist, Magnus; Karlsson, Birger

doi:10.4028/www.scientific.net/msf.519-521.883

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The NA samples were deformed with a total strain amplitude of 0.6% and the PA with 0.8%, this to yield plastic strain amplitudes of 0.2% at half-life, at temperatures of -20, 20 and 60ºC. Inspired by the results on the influence of temperature on the monotonic properties of AA7030 [1][2][3]13], it was decided to perform tests at both lower and higher temperatures than ambient, namely 20 C, 20 C and 60 C. …”

Section: Methodsmentioning

confidence: 99%

“…The alloy AA7030 has been shown earlier to exhibit strong DSA effects in naturally aged [1][2][3] and solution treated [4][5][6][7][8] conditions, while weak effects were found in the peak-aged material [1][2][3]8].…”

Section: Introductionmentioning

confidence: 99%

“…When the dislocations break free from the solute lock, the clusters left behind can nucleate precipitates which act as obstacles for the following dislocations [11]. This causes a continuous increase in the flow stress, which can be seen as an additional strain hardening in [9][10][11][12][13][14]. For solution treated Al-Zn-Mg it has been reported that DP occurs through nucleation of small (0.6 nm) zones, while in naturally aged material the main effect is growth if existing zones (in the range of 1 nm) [11].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Hörnqvist

Karlsson

2010

Procedia Engineering

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The effects of dynamic strain ageing (DSA) and dynamic precipitation (DP) on the stress strain response during low-cycle fatigue of naturally aged (NA) and peak-aged (PA) AA7030 alloy at different temperatures was investigated. The results show that the PA temper is largely unaffected by DSA/DP, and the cyclic deformation behavior is controlled by the accumulation of dislocations and strain localization due to repeated shearing of precipitates. In the NA temper, on the other hand, the effect of temperature on DSA and DP is the main mechanism controlling the stress strain response. At temperature above room temperature, DP in the intense slip bands inhibits cyclic softening and the samples harden until the on-set of crack growth. At lower temperatures, the rate of DP is too slow to compensate for the softening in the slip bands and the stress amplitude saturates or decreases. The stress amplitude development is shown to primarily be a result of the evolution of the effective stress associated with dislocation precipitate interactions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Hörnqvist

Karlsson

2010

Procedia Engineering

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Influence of heat treatment on the cyclic deformation properties of aluminium alloy AA7030

Hörnqvist

Karlsson

2008

Materials Science and Engineering: A

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The Precise Determination of the Johnson–Cook Material and Damage Model Parameters and Mechanical Properties of an Aluminum 7068-T651 Alloy

Bal

Karaveli

Çetin

et al. 2019

Journal of Engineering Materials and Technology

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Al 7068-T651 alloy is one of the recently developed materials used mostly in the defense industry due to its high strength, toughness, and low weight compared to steels. The aim of this study is to identify the Johnson–Cook (J–C) material model parameters, the accurate Johnson–Cook (J–C) damage parameters, D1, D2, and D3 of the Al 7068-T651 alloy for finite element analysis-based simulation techniques, together with other damage parameters, D4 and D5. In order to determine D1, D2, and D3, tensile tests were conducted on notched and smooth specimens at medium strain rate, 100 s−1, and tests were repeated seven times to ensure the consistency of the results both in the rolling direction and perpendicular to the rolling direction. To determine D4 and D5 further, tensile tests were conducted on specimens at high strain rate (102 s−1) and temperature (300 °C) by means of the Gleeble thermal–mechanical physical simulation system. The final areas of fractured specimens were calculated through optical microscopy. The effects of stress triaxiality factor, rolling direction, strain rate, and temperature on the mechanical properties of the Al 7068-T651 alloy were also investigated. Damage parameters were calculated via the Levenberg–Marquardt optimization method. From all the aforementioned experimental work, J–C material model parameters were determined. In this article, J–C damage model constants, based on maximum and minimum equivalent strain values, were also reported which can be utilized for the simulation of different applications.

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Temperature and Strain Rate Effects on the Dynamic Strain Ageing of Aluminium Alloy AA7030

Cited by 3 publications

References 12 publications

Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Influence of heat treatment on the cyclic deformation properties of aluminium alloy AA7030

The Precise Determination of the Johnson–Cook Material and Damage Model Parameters and Mechanical Properties of an Aluminum 7068-T651 Alloy

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