The influence of zirconium on the early stages of aging of a ternary AlZnMg alloy

Mukhopadhyay, A. K.; Yang, Qibin; Singh, Sukhpal

doi:10.1016/0956-7151(94)90406-5

Cited by 86 publications

(46 citation statements)

References 23 publications

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“…the Fe Á/Cu system) [14]; 2. heterogeneous nucleation of the stable phase on the metastable precipitates (e.g. the Al Á/Zn Á/Mg system) [15]; 3. independent nucleation of both phases in the matrix (e.g. the FeÁ/C [16] or the Al Á/MgÁ/Si system).…”

Section: Introductionmentioning

confidence: 99%

Microscopic modelling of simultaneous two-phase precipitation: application to carbide precipitation in low-carbon steels

Perez

Deschamps

2003

Materials Science and Engineering: A

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A thermodynamically-based precipitation model, employing the classical nucleation and growth theories, has been adapted to deal with simultaneous precipitation of metastable and stable phases. This model gives an estimation of the precipitation kinetics (time evolution of radius and density of precipitates for both phases, as well as the evolution of solute fraction) in a wide range of temperature. Results were successfully compared with an experimental isothermal precipitation diagram (Time Á/TemperatureTransformation, TTT) from the literature for the precipitation of e carbide and Fe 3 C in low-carbon steels. #

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Section: Introductionmentioning

confidence: 99%

Microscopic modelling of simultaneous two-phase precipitation: application to carbide precipitation in low-carbon steels

Perez

Deschamps

2003

Materials Science and Engineering: A

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“…Srivatsan and Sriram reported that the formation of stable η phase (MgZn 2 ) decreases to the yield and tensile strength and hardness 20 . The stable η phase (MgZn 2 ) for its own crystal structure related to the ageing time, so the coherency between the precipitates and aluminum matrix disappears.…”

Section: Resultsmentioning

confidence: 99%

“…An increase in the tensile strength, yield strength and hardness, while a decrease in the elongation fracture of SHTWQ and SHTSQ Al-alloy with increase in aging time for 140 °C can be explained by a diffusion assisted mechanism. It causes an increase in the density of GP zones, distortion of lattice planes and hindering of dislocation movement by interference with the motion of dislocation, due to the formation of metastable ή phase precipitates 12,20 . Thus, the hardness of 7075 Al-alloy increases rapidly with an artificial aging time.…”

Section: Discussionmentioning

confidence: 99%

Effect of Quenching Rate and Pre-strain on the Strain Ageing Behaviors of 7075 Aluminum Alloys

Kaçar

Güleryüz

2015

Mat. Res.

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The mechanical properties of aluminum alloys are strongly dependent on the thermo-mechanical process so, the strain ageing behavior of 7075 Al-alloy was investigated in this study. A set of test pieces was solution heat treated at 480 °C for 2 h, water quenched (SHTWQ) then pre-strained for 8% in tension. The test samples were aged at 140 °C for 0.5, 1,2,3,4,6,8,10,12,24, 48, 72 and 96 h in a furnace. The other set of test samples were solution heat treated at 480 °C for 2 h, quenched in sand (SHTSQ) then pre-strained for 8% in tension. They were also aged at 140 °C for same intervals. The effect of strain ageing, on the mechanical properties of Al-alloy, was investigated by mean of hardness, and tensile tests. The results shown that, the quenching rate after solution heat treatment, ageing time and temperature, as well as pre-strain, play a very important role in the precipitationhardening associated with ageing process of the 7075 Al-alloy.

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“…In the literature, [5,6] it is reported that a trace addition of zirconium to ternary Al-Zn-Mg alloys retards and suppresses the formation of GP zones and Ј, slows down the precipitation of , and inhibits the nucleation of T phase. Sluggish (b) precipitation processes in zirconium-containing aluminum of vacancy sinks and vacancy traps in the matrix.…”

Section: A the Effect Of Zirconiummentioning

confidence: 99%

“…zirconium additions, [5,6] in which it has been established that One group of samples from each alloy was aged at room temperature for different times immediately after quenching. Another group of samples was preaged at room temperature were heated from Ϫ20 ЊC to 400 ЊC at a constant heating were prepared by conventional mechanical thinning and twin-jet electropolishing.…”

Section: Introductionmentioning

confidence: 99%

Influence of zirconium and copper on the early stages of aging in Al-Zn-Mg alloys

Jiang

Noble

Hansen

et al. 2001

Metall Mater Trans A

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The effects of zirconium and copper on the early stages of the precipitation processes in an Al-5.5 wt pct Zn-1.2 wt pct Mg alloy have been studied by differential scanning calorimetry (DSC) thermal analysis. Electron diffraction has been used as a complementary technique to aid in the interpretation of the thermal effects observed in the DSC thermograms. The results show that the initial stages of Guinier-Preston zone I (GP(I)) formation at room temperature are not affected by the presence of zirconium, but the rate of Guinier-Preston zone II (GP(II)) precipitation is slowed down significantly. For aging at 100 ЊC, the stability of GP zones is reduced by the addition of zirconium, and this leads to a reduction in the amount of Ј produced during aging. The addition of copper to an Al-5.4 wt pct Zn-1.2 wt pct Mg-0.2 wt pct Zr alloy intensifies the electron diffraction spots from GP(I), suggesting that the strong electron-scatterer copper may be incorporated into GP zones. The rate of growth of GP(I) at room temperature is unaffected by the presence of copper, but the rate of formation of GP(II) at room temperature is retarded. For artificial aging at 100 ЊC, the development of GP(I) and GP(II) is not affected significantly by the presence of copper, but the formation of Ј is stimulated, producing a high number density of very fine Ј precipitates. Preaging at room temperature results in accelerated Ј formation during subsequent aging at 100 ЊC in the zirconium-containing alloy. However, this acceleration of Ј formation is absent when copper is present in the alloy.

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The influence of zirconium on the early stages of aging of a ternary AlZnMg alloy

Cited by 86 publications

References 23 publications

Microscopic modelling of simultaneous two-phase precipitation: application to carbide precipitation in low-carbon steels

Microscopic modelling of simultaneous two-phase precipitation: application to carbide precipitation in low-carbon steels

Effect of Quenching Rate and Pre-strain on the Strain Ageing Behaviors of 7075 Aluminum Alloys

Influence of zirconium and copper on the early stages of aging in Al-Zn-Mg alloys

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