Effects of cooling rate and cryogenic temperature on the mechanical properties and deformation characteristics of an Al-Mg-Si-Fe-Cr alloy

Ma, Yinghan; Liu, Chenglu; Miao, Kesong; Wu, Hao; Li, Rengeng; Li, Xuewen; Fan, Guohua

doi:10.1016/j.jallcom.2023.169559

Cited by 7 publications

(1 citation statement)

References 36 publications

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“…This value was within the 40-270 MPa range of the aluminum 3000 series [29]. As a common metal in the industrial market, a wrought aluminum flat bar is prepared by the extrusion plasticforming process [30,31]. Its yield strength was raised by the strain rate and temperature during this extrusion process [30,32,33].…”

Section: Hardness Estimation and Brinell Testmentioning

confidence: 90%

Young’s Modulus and Hardness Identification of Extruded Aluminum by Scratching Damper

Wong,

Vyas,

Wong

et al. 2024

Machines

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A special vibration damper is proposed for Young’s modulus and hardness identification through a scratching process on extruded aluminum. This paper presents the design and working principle of a scratching damper based on a scratching device. A non-contact electromagnetic shaker is used to generate the shaking force for test sample vibration. The required forces on the scratched material during the scratching process are generated by an adjustable compression spring. The proposed damper is designed and tested on an extruded aluminum 3004 sample for the determination of its Young’s modulus and hardness, and validation is performed using the standard test instruments. The physical dimensions of the scratching tracks are measured using a microscope and utilized to compute the scratching energy factor. Load curves are obtained at different divisions of the scratching process. The loop energy during the scratching process of the tested object is measured and used for the determination of sample material properties. Furthermore, the energy conservation law, scratch energy release rate of semi-conical scratch head, and loop energy release rate are established to determine the Young’s modulus and hardness of the sample. Their estimation accuracies are evaluated. The proposed method has several advantages over the traditional methods, including low cost, directness, and high repeatability. The results suggest this to be used as an alternative to the standard modulus and hardness tester.

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Section: Hardness Estimation and Brinell Testmentioning

confidence: 90%

Young’s Modulus and Hardness Identification of Extruded Aluminum by Scratching Damper

Wong,

Vyas,

Wong

et al. 2024

Machines

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Cryogenic Deformation Behaviour of Aluminium Alloy 6061-T6

Jin,

Lee,

Yoo

et al. 2024

Met. Mater. Int.

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Aluminium alloy 6061-T6 (AA6061-T6) shows a promising potential for cryogenic structural applications. This alloy exhibits remarkable monotonic tensile properties at low temperatures. However, there is a limited number of studies on the cryogenic deformation behaviour. In this study, both monotonic and cyclic loading were conducted, and various microstructure characterisation techniques were performed to understand influence of cryogenic temperatures on microstructure evolution and deformation behaviour of this alloy. At cryogenic temperatures, the aluminium alloy exhibited superior mechanical properties over those at room temperature. Yield stress, UTS and elongation at failure increased by 18%, 33%, and 53% at 77 K compared to those at room temperature. Such increase in mechanical properties was attributed by the stronger resistance to dislocation movement due to the reduced thermal assistance. Work hardening rate also increased as dynamic recovery was suppressed at lower temperatures. As a result, a high density of dislocations was evenly distributed within grain interior and led to a homogeneous deformation. The test temperature appeared to have a significant influence on fatigue performance; maximum stress response increased by 23% at 108 K with respect to those at room temperature. During cyclic loading, a high number of dislocations was generated to accommodate prescribed strain because of the resistance to dislocation movement including the pinning of dislocations by β’’ precipitates which are known to be sheared at room temperature. Thus, the alloy exhibited an enhanced cyclic hardening behaviour without a noticeable cyclic softening phase. Fatigue life improved by 143% at 108 K with respect to that at room temperature as the homogeneous deformation prohibited localised slip activity and delayed formation of slip bands which act as crack initiation sites. Moreover, the initiation and propagation of secondary cracks at 108 K retarded the propagation of main crack to improve fatigue life. Graphical Abstract

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Effect of Artificial Cooling Extrusion on Microstructure and Mechanical Properties of Mg–Zn–Y Alloys

Liao,

Zhao,

et al. 2024

Acta Metall. Sin. (Engl. Lett.)

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Effects of cooling rate and cryogenic temperature on the mechanical properties and deformation characteristics of an Al-Mg-Si-Fe-Cr alloy

Cited by 7 publications

References 36 publications

Young’s Modulus and Hardness Identification of Extruded Aluminum by Scratching Damper

Young’s Modulus and Hardness Identification of Extruded Aluminum by Scratching Damper

Cryogenic Deformation Behaviour of Aluminium Alloy 6061-T6

Effect of Artificial Cooling Extrusion on Microstructure and Mechanical Properties of Mg–Zn–Y Alloys

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