Grain structure effect on quench sensitivity of Al—Zn—Mg—Cu—Cr alloy

Li, Chengbo; Suqi, Han; Liu, Shengdan; Deng, Yunlai; Zhang, Xinming

doi:10.1016/s1003-6326(16)64319-4

Cited by 21 publications

(6 citation statements)

References 21 publications

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“…Normally, the quench sensitivity of 7085 aluminum alloy is mainly controlled by the stability of supersaturated solid solution. During quenching, the precipitation phase and decline degree of aging strength are decreased with increasing the stability of supersaturated solid solution, which leads to the low quench sensitivity of 7085 aluminum alloy [26][27][28][29]. Generally, the stability of supersaturated solid solution is reflected by the synthesis of multiple field energies.…”

Section: Discussionmentioning

confidence: 99%

Investigation on the Quench Sensitivity of 7085 Aluminum Alloy with Different Contents of Main Alloying Elements

Chen

2019

Metals

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The quench sensitivity of 7085 aluminum alloy with different contents of the main alloying elements (Zn, Mg and Cu) was investigated using time-temperature-transformation (TTT) curves and end quenching experiments. Then, the quenching microstructure was analyzed using transmission electron microscopy. With increasing the contents of the main alloying elements, the transitions and nose temperatures of the TTT curves are obviously increased, while the incubation time of 0.5% η (MgZn2) phase precipitation content is decreased. In addition, as the contents of the main alloying elements decrease, the conductivity of the quenched samples is increased, but the hardness of the quenched samples is decreased. Moreover, the size and area fraction of the η phase are increased with increasing the contents of the main alloying elements. Based on the experimental results, the increase of Mg and Cu contents can decrease the stability of supersaturated solid solution and increase the lattice distortion energy, which can increase the quench sensitivity of 7085 aluminum alloy.

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Section: Discussionmentioning

confidence: 99%

Investigation on the Quench Sensitivity of 7085 Aluminum Alloy with Different Contents of Main Alloying Elements

Chen

2019

Metals

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“…In addition to increasing the recrystallization temperature of the alloy [5,6], they can also significantly inhibit the growth of crystal grains [7]. Cr is prone to form E-(Cr 2 Mg 3 Al 18 ), which will increase the quenching sensitivity of the alloy and affect the properties of the alloy [8]. Among the trace elements, the inhibitory effects of Al 3 Zr and Al 3 Sc are the best [4], so these two elements (Zr, Sc) were selected for the study.…”

Section: Of 15mentioning

confidence: 99%

The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys

et al. 2021

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This study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al–4.5Zn–1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated through a hardness test and tensile test. The microstructures were analyzed by an optical microscope (OM), a differential scanning calorimeter (DSC), a transmission electron microscope (TEM), a scanning electron microscope (SEM), and electron backscattered diffraction (EBSD). The results show that the grain refinement effect of the as-cast, homogenized, and recrystallized Al–4.5Zn–1.5Mg alloy containing 0.05Sc (wt%) after the T6 heat treatment was more significant than that of the alloy containing 0.1Zr (wt%). In addition, compared with the aforementioned one-stage homogenization heat treatment, the two-stage homogenization made the dispersed grain phase (Al3Zr/Al3Sc) smaller. As a result, the T6 mechanical strength of the alloy after the two-stage homogenization heat treatment was better than that of the contrastive alloy after the one-stage homogenization heat treatment. However, the two different homogenization heat treatments caused a greater divergence between the sizes of the dispersed grain phases of the Al–4.5Zn–1.5Mg alloys containing Zr than between the sizes of the dispersed grain phases of the alloys containing Sc. Therefore, after the two-stage homogenization heat treatment, the alloy with 0.1Zr (wt%) promoted the mechanical properties better than the alloy with 0.05Sc (wt%).

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“…al. studied the effect of grain structure on quench sensitivity of an Al−Zn−Mg−Cu−Cr alloy, the results showed that the decrease of the quenching rate from 960 °C/s to 2 °C/s revealed a decrease in the hardness after aging for the homogenized and solution heat treated alloy (H-alloy) with large equiaxed grains, for the extruded and solution heat treated alloy (E-alloy) an elongated grains and subgrains had been dominated [13]. The Al-based alloys with additives of magnesium (Mg), and silicon (Si) belong to wrought aluminum alloys which 2 of 13 are heat treated.…”

Section: Introductionmentioning

confidence: 98%

Mechanical and Corrosion Behavior of Al-Zn-Cr Family Alloys

Nassef¹,

El-Garaihy²,

El-Hadek³

2017

Preprint

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Aluminum base alloys containing chromium (Cr) and zinc (Zn) were produced using extrusion and heat treated powder metallurgy. Cr addition ranged between 5 to 10 wt. % while Zn was added in an amount between 0 to 20 wt. %. Heat treatment processes were performed during powder metallurgy process at different temperatures followed by water quenching. Similar alloys were extruded, with an extrusion ratio of 4.6 to get proper densification. Optical microscopy was used for microstructure investigations of the produced alloys. The element distribution microstructure study was carried out using the Energy Dispersive X-ray analysis method. Hardness and tensile properties of the investigated alloys have been examined. Wear resistance tests were carried out and the results were compared with these of the Al-based bulk alloys. Results showed that the aluminum base alloys containing 10wt. % Chromium and heat treated at 500°C for one hour followed by water quenching exhibited the highest wear resistance and better mechanical properties.

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Grain structure effect on quench sensitivity of Al—Zn—Mg—Cu—Cr alloy

Cited by 21 publications

References 21 publications

Investigation on the Quench Sensitivity of 7085 Aluminum Alloy with Different Contents of Main Alloying Elements

Investigation on the Quench Sensitivity of 7085 Aluminum Alloy with Different Contents of Main Alloying Elements

The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys

Mechanical and Corrosion Behavior of Al-Zn-Cr Family Alloys

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