Fatigue behavior and dislocation substructures for 6063 aluminum alloy under nonproportional loadings

Liu, Xiaoshan; He, Guoqiu; Ding, Xiaofeng; Mo, Defeng; Zhang, Weihua

doi:10.1016/j.ijfatigue.2008.11.019

Cited by 22 publications

(10 citation statements)

References 29 publications

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“…Liu et al [23] reported exhibition of labyrinth substructure of dislocations for 6063 aluminum under 90 • out-of-phase loading, and therefore, a decrease in dislocation movement, resulting in severe cyclic strain hardening. Although aluminums usually have high SFE levels and do not exhibit non-proportional cyclic hardening, the SFE of this alloy was reduced by addition of Mg [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure and hardness on non-proportional cyclic hardening coefficient and predictions

Shamsaei

Fatemi

2010

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Effect of microstructure and hardness on non-proportional cyclic hardening coefficient and predictions

Shamsaei

Fatemi

2010

Materials Science and Engineering: A

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“…It is generally believed that the additional cyclic hardening effect of metals under nonproportional multiaxial loading is attributed to the start‐up of multiple slip systems and dislocation motion 41 . Under the nonproportional multiaxial loading, the maximum shear stress plane rotates periodically, 42 which results in the activation of multiple slip systems in turn, 43 orienting more grains to the slip‐favored directions and improving the speed for the start‐up of slip systems on different orientation planes 44 . The rapid start‐up of slip systems not only facilitates the rapid increase of dislocation density 45 but also enhances the interaction between dislocations of different slip systems, 46 which leads to the additional restriction of dislocation mobility 47 .…”

Section: Resultsmentioning

confidence: 99%

Effect of hot isostatic pressing on fatigue behavior and fracture mechanism of A319 aluminum alloy under uniaxial and nonproportional multiaxial loading conditions

Liao

Liu

et al. 2022

Fatigue Fract Eng Mat Struct

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The effect of hot isostatic pressing (HIPing)‐induced porosity difference on the fatigue behavior and fracture mechanism of A319 aluminum alloy under uniaxial and nonproportional multiaxial loading is investigated. Non‐HIPed alloy exhibits weaker nonproportional additional hardening capacity than HIPed alloy, which is ascribed to the nonproportional multiaxial loads that enhance the cyclic softening induced by casting pores. Additional plastic damage caused by nonproportional multiaxial loads is highly susceptible to HIPing. Torsional loads trigger the tension‐compression asymmetry of the axial stress response during nonproportional multiaxial fatigue. Multiaxial fatigue life is more sensitive to HIPing at minor total strain amplitudes. The rapid bridging among adjacent pores serves as the preferred channel for fatigue crack propagation. Nonproportional multiaxial loads improve the probability of encountering pores during fatigue crack initiation and propagation.

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“…Al–Si cast alloy has become an alternative structure material to replace steels in many industrial applications due to its light weight, high corrosion resistance, and comprehensive mechanical properties. However, practical application scenarios have put forward high requirements for the fatigue performance of Al–Si cast alloy, and a significant amount of related researches had been performed in the last few decades 1–5 …”

Section: Introductionmentioning

confidence: 99%

A new microstructure‐based multiaxial fatigue life prediction model for A319 casting alloys

Zhou

Liu

et al. 2021

Fatigue Fract Eng Mat Struct

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This paper describes a microstructure‐based multiaxial nonproportional fatigue life prediction model applied to A319 alloy. The materials made with different casting cooling rates and Sr modification are characterized and quantified in terms of secondary dendrite arm spacing, size, and aspect ratio of eutectic Si particles. Multiaxial nonproportional fatigue tests have been performed on six groups of A319 alloys to systematically analyze the effect of microstructure and loading path on the fatigue properties of Al–Si cast alloy. The first part of the paper is focused on microstructure quantitative characterization to determine the influence of different casting conditions, followed by stress response behavior and fatigue fracture analysis. Finally, a new multiaxial fatigue life prediction model for Al–Si alloy is proposed, for which 56% of the data points fall in the bound lines of factor of 2 and 83% of the data points fall in the bound lines of factor of 3.

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Fatigue behavior and dislocation substructures for 6063 aluminum alloy under nonproportional loadings

Cited by 22 publications

References 29 publications

Effect of microstructure and hardness on non-proportional cyclic hardening coefficient and predictions

Effect of microstructure and hardness on non-proportional cyclic hardening coefficient and predictions

Effect of hot isostatic pressing on fatigue behavior and fracture mechanism of A319 aluminum alloy under uniaxial and nonproportional multiaxial loading conditions

A new microstructure‐based multiaxial fatigue life prediction model for A319 casting alloys

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