Characterization of the mechanical properties changes in an Al–Zn–Mg alloy after a two-step ageing treatment at 70° and 135°C

Chemingui, Mahmoud; Khitouni, Mohamed; Jóźwiak, K.; Mesmacque, G.; Kolsi, A. W.

doi:10.1016/j.matdes.2009.12.033

Cited by 76 publications

(23 citation statements)

References 31 publications

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“…The strengthening mechanism of the ageing at T6 (120°C for 24h) for the base (Al-Zn-Cu-Mg) alloy is attributed to the precipitation hardening i.e., the effects of the GuinierPreston zones coherent with nanometer sized h′ metastable precipitates. These precipitates act as pinning points which impede the dislocation movement [31][32][33] . The XRD and the EDS results have revealed the existence of the η and η′ phases.…”

Section: Discussionmentioning

confidence: 99%

The Role of cobalt and nickel intermetallic phases on the mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys

2014

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In this study, the effects of cobalt and nickel additions on microstructure evolution and mechanical properties of Al-Zn-Mg-Cu alloys produced by chill casting process were investigated. Al-Zn-MgCu aluminum alloys containing Ni and Co additives were homogenized at different heat treatment conditions, aged at 120°C for 24 h, and retrogressed at 180°C for 30 min then re-aged at 120°C for 24h.Comparison of the ultimate tensile strength of the Al-Zn-Mg-Cu base alloy underwent RRA temper process with that of the base alloy underwent a similar heat treatment process after the addition of 0.5 wt. % Ni and 0.5 wt. % Co showed that the gains of tensile strengths of the orders of 100 MPa and 135 MPa were attained respectively. These improvements are attributed to phase dispersion particles of the formation of Ni and Co-rich such as and Co intermetallic dispersoids retarded the grain growth, led to grain refinement and precipitation hardening and resulted in further strengthening of the Al alloy. Microstructure characterization of the alloys was carried out using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD).

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Section: Discussionmentioning

confidence: 99%

The Role of cobalt and nickel intermetallic phases on the mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys

2014

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“…A low-temperature variation of the treatment, so called LTTT, is a method of thermo-mechanical processing often used for precipitation-strengthened aluminium alloys. It ensures obtaining high mechanical and fatigue properties of alloys while maintaining optimal plastic properties [1,2].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Kowalski

Ozgowicz

Jurczak

et al. 2018

Metals

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Abstract:The present manuscript aims to determine the effect of various deformation levels during low-temperature thermo-mechanical treatment (LTTT) on the microstructure and fatigue strength of Zr-microalloyed Al-Zn-Mg alloy. The fatigue strength of the alloy was studied in high-cycle bending-torsion tests. The determination of the influence of plastic deformation level during LTTT on the microstructure was based on transmission electron microscopy (TEM) observations. The analysis of fracture after the fatigue tests was performed based on fractographic images using scanning electron microscopy (SEM). It was found that the major factor affecting the microstructure of the alloy, and determining the nature of fatigue fracture, is the strain level applied during LTTT.

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“…M. Li studied avoiding and eliminating strain aging embrittlement by heat treatment methods commonly used in engineering [3]. N. Han et al [4] and M. Chemingui et al [5] studied the effect of stretching and aging on the microstructure of 7050 aluminum alloy and Al-Zn-Mg alloy by optical microscopy, scanning electron microscopy and transmission electron microscopy. A. Vasilyev et al [6] revealed that the strain aging behavior of ultra-low carbon bake hardened steels in industrial production was the pinning of the gap atoms to dislocations.…”

Section: Introductionmentioning

confidence: 99%

“…Serajzadeh et al [7] argued that the static strain aging after hot rolling leaded to an increase in material yield strength and tensile strength. M. Chemingui et al [5] tested the mechanical properties of Al-Zn-Mg alloy at 70°C and 135°C in two aging steps with hardness and tensile tests. M. Shahriary et al [8] studied the effect of dynamic strain aging on room temperature mechanical properties of high martensite dual phase (HMDP) steel，and S. Luo et al [9] studied the effect of dynamic strain aging on the microstructure and mechanical properties of a reactor pressure vessel steel.…”

Section: Introductionmentioning

confidence: 99%

Study on the Microstructure and Mechanical Properties of 20 Steel Strain Aging

Li¹,

Wang²

2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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Abstract:The strain aging process in the prefabrication process of 20 steel high-pressure pipe was simulated. The microstructure, hardness and impact absorption energy of the 20 steel pipes in the process were studied, and the mechanism was explained. The study shows that normalizing before prefabricated and stress relief annealing after prefabricated can be better to ensure the performance of the elbow.

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Characterization of the mechanical properties changes in an Al–Zn–Mg alloy after a two-step ageing treatment at 70° and 135°C

Cited by 76 publications

References 31 publications

The Role of cobalt and nickel intermetallic phases on the mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys

The Role of cobalt and nickel intermetallic phases on the mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Study on the Microstructure and Mechanical Properties of 20 Steel Strain Aging

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