TTP and TTT diagrams for quench sensitivity and ageing of 1424 alloy

Davydov, V. G.; Ber, L. B.; Kaputkin, E. Ya.; Komov, V.I; Ukolova, O. G.; Лукина, Е. А.

doi:10.1016/s0921-5093(99)00659-0

Cited by 43 publications

(26 citation statements)

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“…Reducing of plasticity of annealed alloys mainly correlates with the high content of magnesium in solid solution and also with increasing of T2-phase quantity. Structural studies have demonstrated [2,5] that the main reason for low plasticity of annealed alloys of this system is a big volume fraction of δ'-phase (Al3Li) particles not crossed by dislocations or β'-phase composite particles with δ'-phase shells. These particles larger than 15 nm are formed under ageing at the temperature of annealing and slow cooling of alloys.…”

Section: Introductionmentioning

confidence: 94%

“…Despite all these advantages, AlMg6Li2 alloys are not widely used, mainly because of the low technological plasticity [4]. Reduced plasticity of annealed alloys with lithium is associated with high alloying and high volume ratio of phases compared to traditional alloys and also, to a lesser extent, with the incompleteness of recrystallization, reason for this is the large number of interfering particles Al3(Zr,Sc,Li)β'-phase [4][5]. Magnesium content has a strong influence on technological plasticity of annealed alloys of system Al-Li-Cu-Mg-Zr [5].…”

Section: Introductionmentioning

confidence: 99%

“…Reduced plasticity of annealed alloys with lithium is associated with high alloying and high volume ratio of phases compared to traditional alloys and also, to a lesser extent, with the incompleteness of recrystallization, reason for this is the large number of interfering particles Al3(Zr,Sc,Li)β'-phase [4][5]. Magnesium content has a strong influence on technological plasticity of annealed alloys of system Al-Li-Cu-Mg-Zr [5]. The studies have shown that annealing process at 400-530°Cfollowed by slow cooling results only in formation of phaseT2 (Al6CuLi3) [5].…”

Section: Introductionmentioning

confidence: 99%

“…Magnesium content has a strong influence on technological plasticity of annealed alloys of system Al-Li-Cu-Mg-Zr [5]. The studies have shown that annealing process at 400-530°Cfollowed by slow cooling results only in formation of phaseT2 (Al6CuLi3) [5]. The measurements of the lattice period allowed determining that nearly all of magnesium in alloy remains in solid solution after annealing, a small portion of it is included in T2-phase and precipitates under annealing.…”

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confidence: 99%

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ON THE INFLUENCE OF SCANDIUM ON THE FLUIDITY OF THE AlMg6Li2 MELTS

Чикова

Ovsyannikov²,

Резник

2016

Acta Metall Slovaca

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We conducted the study of viscosity liquid alloys AlMg6Li2(Sc) under the heating and subsequent cooling of samples. Results of these measurements allowed defining critical temperatures. The processing melt by heating above the critical temperature cause irreversible destruction of microinhomogeneities of hereditary nature. The irreversible destruction of micro-inhomogeneities improves the casting properties of the melts AlMg6Li2(Sc).Keywords: alloys Al-Mg-Li-Sc, microstructure, EDS-analysis, melt, viscosity, fluidity, temperature-time processing of melt IntroductionThe alloys based on Al-Mg-Li system are being actively developed over the last years. Aluminum alloys containing lithium have a number of advantages in comparison with aluminum alloys based on other systems: their specific mass is averagely 10% lesser and the modulus of elasticity is 12% higher. Moreover, aluminum-lithium alloys can possess high mechanical characteristics (tensile strength reaches 600-650 MPa) with the good factors of crack resistance and corrosion resistance [1][2][3]. Despite all these advantages, AlMg6Li2 alloys are not widely used, mainly because of the low technological plasticity [4]. Reduced plasticity of annealed alloys with lithium is associated with high alloying and high volume ratio of phases compared to traditional alloys and also, to a lesser extent, with the incompleteness of recrystallization, reason for this is the large number of interfering particles Al3(Zr,Sc,Li)β'-phase [4][5]. Magnesium content has a strong influence on technological plasticity of annealed alloys of system Al-Li-Cu-Mg-Zr [5]. The studies have shown that annealing process at 400-530°Cfollowed by slow cooling results only in formation of phaseT2 (Al6CuLi3) [5]. The measurements of the lattice period allowed determining that nearly all of magnesium in alloy remains in solid solution after annealing, a small portion of it is included in T2-phase and precipitates under annealing. Reducing of plasticity of annealed alloys mainly correlates with the high content of magnesium in solid solution and also with increasing of T2-phase quantity. Structural studies have demonstrated [2,5] that the main reason for low plasticity of annealed alloys of this system is a big volume fraction of δ'-phase (Al3Li) particles not crossed by dislocations or β'-phase composite particles with δ'-phase shells. These particles larger than

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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ON THE INFLUENCE OF SCANDIUM ON THE FLUIDITY OF THE AlMg6Li2 MELTS

Чикова

Ovsyannikov²,

Резник

2016

Acta Metall Slovaca

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“…Temperature-time-property (TTP) curves are an effective approach to evaluate quench sensitivity and many TTP curves of the aluminum alloys have already been completed to control and improve their response to a rapid quench [10][11][12]. Fink and Willey [10] examined the quench sensitivity of 7075-T6 alloy using TTP curves, also obtained by an interrupted quenching technique.…”

Section: Introductionmentioning

confidence: 99%

TTP Curves and Microstructural Evolution Mechanism After Quenching in Aluminum Alloy 6082

Gao

Wang

Wen

et al. 2012

Metallogr. Microstruct. Anal.

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Temperature-time-property (TTP) curves for aluminum alloy 6082 were acquired by an interrupted quenching method. The TTP curves presented a ''C''-shape and the critical temperature range was 240-440°C with temperature at the nose of the C-curve of approximately 335°C. At this temperature, the greatest rate of second phase development and the largest, and most rapid, drop in hardness was observed. The change was approximately 50% of the maximum when isothermally held or 50 s. Microstructural evolution of the quenched aluminum alloy 6082 was analyzed with a transmission electron microscope (TEM). TEM analysis results showed that secondary phase particle growth rate was controlled by diffusion. Growth was rapid during the critical temperature range. When the holding time was prolonged, the spherical and needle-shaped precipitates, which provided a significant strengthening effect, rapidly transformed into coarse, rodshaped precipitates. This over-aged condition resulted in loss of the precipitate strengthening effect.

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Thermal Stability and S‐Phase Evolution in Ultrafine‐Grained Al−Mg−Li Alloy Produced by Equal‐Channel Angular Pressing

2021

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Ultrafine‐grained (UFG) aluminum alloys produced by severe plastic deformation demonstrate high mechanical properties but low thermal stability, which can negatively affect their service characteristics. Herein, the thermal stability of structure and S‐phase (Al2LiMg) evolution in UFG Al−5.5Mg−2.2Li−0.12Zr alloy produced by equal‐channel angular pressing (ECAP) are studied during heating and direct annealing. It is found that the UFG structure with an average grain size of about 1 μm formed by ECAP is preserved at up to 410 °C (≈0.7 T m), with a significant decrease in dislocation density (from 5 × 109 to 3 × 108 cm−2) and the fraction of low‐angle grain boundaries (from 20% to 5%) at 380 °C. The dissolution of metastable semicoherent SI‐phase particles located within grains at 330 °C is accompanied by a corresponding increase in Mg content in solid solution. The transfer of Mg atoms from solid solution to grain boundaries at 380 °C with subsequent coalescent growth of SII particles leads to an increase in the volume fraction (from 3% to 12%) and size of the particles and to recrystallization in UFG Al−Mg−Li alloy at 415 °C.

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TTP and TTT diagrams for quench sensitivity and ageing of 1424 alloy

Cited by 43 publications

References 2 publications

ON THE INFLUENCE OF SCANDIUM ON THE FLUIDITY OF THE AlMg6Li2 MELTS

ON THE INFLUENCE OF SCANDIUM ON THE FLUIDITY OF THE AlMg6Li2 MELTS

TTP Curves and Microstructural Evolution Mechanism After Quenching in Aluminum Alloy 6082

Thermal Stability and S‐Phase Evolution in Ultrafine‐Grained Al−Mg−Li Alloy Produced by Equal‐Channel Angular Pressing

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