Effect of heat treatment on plasticity of Al–Zn–Mg alloy: Microstructure evolution and mechanical properties

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

doi:10.1016/j.phpro.2009.11.079

Cited by 21 publications

(11 citation statements)

References 14 publications

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“…Other works reported that the precipitation sequence in Al-Mg-Zn alloys is: α-Supersaturated solid solution (α-sss)  Guinier-Preston zones (GP zones)  metastable phase ' (Hex)  equilibrium phase (MgZn 2 ) (Hex) [7,8].…”

Section: Introductionmentioning

confidence: 99%

Fine Scale Precipitates in Al-Mg-Zn Alloys after Various Aging Temperatures

Afify¹,

Gaber²,

Abbady³

2011

MSA

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This article deals with investigation of fine-scale precipitation in Al-Mg-Zn alloys with compositions of Al - 2 at% Mg- x at% Zn, (x = 1.8, 2 and 4.2). The precipitates morphology was examined by scanning electron microscope (SEM) and correlated with the microhardness (HV) and differential scanning calorimetry (DSC) of the specimens. The precipitates are characterized as h’ (MgZn2) and h (MgZn2) phases of hexagonal structure of the same composition with a slight difference in lattice parameters. In addition, T-phase pf composition (Mg32 (Al, Zn)49) having a cubic crystal structure. Owing to the determined activation energies of the precipitates, the kinetics associated with their nucleation and growth can be characterized. The thermal energy acquired during aging leads to the agglomeration of precipitates to or larger particle sizes

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Section: Introductionmentioning

confidence: 99%

Fine Scale Precipitates in Al-Mg-Zn Alloys after Various Aging Temperatures

Afify¹,

Gaber²,

Abbady³

2011

MSA

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“…Söz konusu alaşımlarda alüminyum oranının artırılması durumunda mekanik özelliklerindeki iyileşmenin yanı sıra yoğunluklarının düşmesi nedeniyle özgül mukavemet değerlerinin de iyileştiği gözlenmiştir [12,13]. Alaşım elementlerinin alüminyum çinko esaslı alaşımların sertlik, mukavemet ve/veya aşınma özelliklerine etkilerinin incelendiği çalışmalarda ise bakır [3,18], silisyum [3,15], mangan [19], nikel [20], magnezyum [21] ve bor [22,23] gibi elementlerin söz konusu özelliklerin birini veya birden fazlasını olumlu etkilediği ve genellikle çekme dayanımlarının artmasıyla aşınma dirençlerinin de iyileştiği belirlenmiştir. Bu elementlerin Al-Zn alaşımlarının mukavemet özelliklerine olumlu etkileri katı çözelti sertleşmesi, ikincil faz çökelmesi, içyapıda neden oldukları bileşiklerin etkileri veya tane incelmesi mekanizmalarına dayandırılarak açıklanmıştır.…”

Section: 17341/gazimmfd464676unclassified

“…Bu elementlerin Al-Zn alaşımlarının mukavemet özelliklerine olumlu etkileri katı çözelti sertleşmesi, ikincil faz çökelmesi, içyapıda neden oldukları bileşiklerin etkileri veya tane incelmesi mekanizmalarına dayandırılarak açıklanmıştır. Fakat bu çalışmalarda aynı zamanda bakır, mangan ve nikelin yüksek yoğunlukları nedeniyle söz konusu alaşımların yoğunluğunu artırdığı, dolayısıyla özgül mukavemetlerini olumsuz etkilediği, magnezyum ve silisyumun ise kopma uzaması değerlerini düşürdüğü de görülmüştür [15,21]. Bu olumsuzlukların yanı sıra bakırın Al-Zn alaşımlarının içyapısında kararsız fazların oluşumuna neden olduğu, silisyumun ise içyapıda çözünmediği, homojen bir dağılım sergilemediği ve sünekliği olumsuz etkilediği gözlenmiştir [3,17].…”

Section: 17341/gazimmfd464676unclassified

Titanyum ile tane inceltmenin Al-25Zn alaşımının mikroyapı, mekanik ve korozyon özelliklerine etkisinin incelenmesi

Hekìmoğlu

Çalış

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Structural and mechanical properties of Al-25Zn-Ti alloys  Effect of titanium on the microstructure, mechanical and corrosion properties of Al-25Zn-Ti alloy  Grain refinement with titanium Figure A. The variations in hardness, yield strength, tensile strength, elongation to fracture of Al-25Zn-(0.01-1)Ti alloys with titanium content. Purpose:The main aim of this study is to investigate grain refinement effect of titanium on the microstructural, mechanical and corrosion properties of new alloys produced by adding different ratios of titanium to the Al-25Zn based alloys. Theory and Methods:In this study, one binary Al-25Zn and eleven ternary Al-25Zn-Ti alloys were produced by permanent mold casting method. Microstructures of the produced alloys were examined with standard metallographic techniques including SEM examinations and XRD studies. Grain sizes of the alloys were measured by the linear intersection method. Hardness values of the alloys were measured by using Brinell test method. The values of yield strength, tensile strength, and elongation to fracture of the alloys determined with tensile test. Corrosion tests were carried out according to ASTM G5 standard with electrochemical experimental setup. Results:Titanium additions significantly reduce grain size of the Al-25Zn alloys. Al3Ti phase begins to form in the microstructure of the Al-25Zn alloy after 0.01% titanium content. The values of hardness, yield strength, tensile strength, and elongation to fracture of the Al-25Zn-Ti alloys increase up to 0.01%Ti content, but above it these values decrease Conclusion:Titanium can be used in the Al-25Zn alloys as a grain refiner. Certain rates titanium addition positively affects the hardness, strength, elongation to fracture, and quality index of the Al-Zn alloys. However, addition of it to Al-25Zn alloys deteriorates corrosion resistance.

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“…Scandium (Sc) used for grain refinement agent in cast aluminium alloys [1]- [3]. The main functions of these alloys are to increase strength without affecting other properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Microstructure And Mechanical Properties of Al-Zn-Mg and Al-Zn-Mg-Sc Alloys After Double Passes Friction Stir Processing

Mandal¹

2017

IJMSE

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Abstract:In this study, the two types of aluminium alloys namely Al-Zn-Mg and Al-Zn-Mg-Sc were developed by casting route. The cast plates were subjected to double passes friction stir processing (FSP) by in-situ vertically fitted milling machine. The tool design and process parameters were found to affect the microstructural and mechanical properties of these aluminium alloys. Therefore, the experimental samples were collected from the stirring zone and selected for mechanical testing. The FSP caused intense plastic deformation, material mixing, and thermal exposure, resulting in significant microstructural refinement, densification, and homogeneity of processed zone. It has been observed that the mechanical properties improved as a result of the complex interactions due to FSP, thermo-mechanical effects, dissolution, coarsening and re-precipitation of the strengthening precipitates in these two experimental aluminium alloys. It can be concluded that the strengthening effect of the Al-Zn-Mg and Al-Zn-Mg-Sc alloys after FSP are associated with the fine grain strengthening, subgrain strengthening and precipitation strengthening of Al3Sc and MgZn2 precipitates. Finally, the resultant properties have been evaluated by FSP parameters such as rotational speed of 1000 rpm and traverse speed of 70 mm/min and specified tool design. In addition, the detrimental effect of high Zn content (~8.20 wt.%) and high Sc content (~0.87 wt.%) aluminium alloy may be attributed to the vaporization of Zn at the time of the FSP. The experimental samples were collected from double passes FSPed zone and critically examined for optical microscopy (OM), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Vicker's hardness testing, tensile testing and fractographic analysis.

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Effect of heat treatment on plasticity of Al–Zn–Mg alloy: Microstructure evolution and mechanical properties

Cited by 21 publications

References 14 publications

Fine Scale Precipitates in Al-Mg-Zn Alloys after Various Aging Temperatures

Fine Scale Precipitates in Al-Mg-Zn Alloys after Various Aging Temperatures

Titanyum ile tane inceltmenin Al-25Zn alaşımının mikroyapı, mekanik ve korozyon özelliklerine etkisinin incelenmesi

Investigation of Microstructure And Mechanical Properties of Al-Zn-Mg and Al-Zn-Mg-Sc Alloys After Double Passes Friction Stir Processing

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