Effect of strain-modified particles on the formation of fined grains and the properties of AA7050 alloy

Lang, Yujing; Cui, Hua; Cai, Yanfei; Zhang, Jishan

doi:10.1016/j.matdes.2012.02.005

“…that thermomechanical treatments greatly affect the mechanical properties and microstructure of aluminum alloys [25]. Therefore, by performing thermomechanical treatments, tensile strength and elongation can be increased simultaneously [26].…”

Section: Investigation Of Mechanical Properties Of the Alloysmentioning

confidence: 99%

“…For example, Al-Zn-Mg-Cu alloys treated by conventional thermomechanical processes have a grain size of more than 30 microns. Interestingly, secondary phase particles in Mg-Cu-Al-Zn alloys have been shown to play a role in grain modi cation during thermomechanical processing [20][21][22][23][24][25]. Therefore, the combination of alloying and the addition of elements such as scandium, and plastic deformation and heat treatment to control these sediments or particles during thermomechanical processing can dramatically affect the microstructure evolution of Al-Zn-Mg-Cu alloys to modify grains and improve their properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermomechanical treatment of Al-Zn-Mg-Cu with minor amount Sc and Zr on the mechanical properties

Kheradmand

¹

,

Mirdamadi

²

,

Lalegani

³

et al. 2021

Preprint

0

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In this study, mechanical and microstructural properties of Al-Zn-Mg-Cu-Zr cast alloy with 0.1% Sc under homogeneous, dissolution, and T6 and thermomechanical treatments with the aim of increasing the volume fraction of MgZn2 and Al3(Sc,Zr) reinforcing sediments were examined by hardness, microscopic examinations and tensile tests and software analysis. The results showed that firstly, the hardness results are well proportional to the results of tensile properties of alloys and secondly, the strength of the alloy with thermomechanical treatments compared to T6 treatments increased from 492 MPa to 620 MPa and the elongation increased from 8% to 17% and 100 % upgraded. Microstructural investigation and fracture cross section showed that Al3(Sc,Zr) nanoparticles were evenly distributed among MgZn2 particles and the alloy fracture was of semi-ductile type and in the fracture section nanoparticles less than 10 nm were observed at the end of the dimples. Also, the volume fraction of nanoparticles in the whole microstructure of thermomechanical treatment samples was much higher than that of T6 heat treated samples, so that the percentage of Al3(Sc,Zr) sediments from less than 1% in T6 operation to 8.28% in quench-controlled thermomechanical operation (with 50% deformation) has arrived. QI index in thermomechanical treatment samples is 19% higher than T6 samples, so that this index has increased from 641 in T6 operation to 760 in samples under thermomechanical treatment due to sediment morphology, volume fraction of sediments, their uniform distribution in the matrix, and nano sized sediments in samples under thermomechanical treatment.

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“…that thermomechanical treatments greatly affect the mechanical properties and microstructure of aluminum alloys [23]. Therefore, by performing thermomechanical treatments, tensile strength and elongation can be increased simultaneously [24].…”

Section: Investigation Of Mechanical Properties Of the Alloysmentioning

confidence: 99%

“…For example, Al-Zn-Mg-Cu alloys treated by conventional thermomechanical processes have a grain size of more than 30 microns. Interestingly, secondary phase particles in Mg-Cu-Al-Zn alloys have been shown to play a role in grain modi cation during thermomechanical processing [18][19][20][21][22][23]. Therefore, the combination of alloying and the addition of elements such as scandium, and plastic deformation and heat treatment to control these sediments or particles during thermomechanical processing can dramatically affect the microstructure evolution of Al-Zn-Mg-Cu alloys to modify grains and improve their properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Minor Amount of Sc on the Thermomechanical Treatment of Al-Zn-Mg-Cu-Zr Alloy

Kheradmand

¹

,

Mirdamadi

²

,

Lalegani

³

2021

Preprint

0

View full text Add to dashboard Cite

In this study, mechanical and microstructural properties of Al-Zn-Mg-Cu-Zr cast alloy with 0.1% Sc under homogeneous, dissolution, and T6 and thermomechanical treatments with the aim of increasing the volume fraction of MgZn2 and Al3(Sc,Zr) reinforcing sediments were examined by hardness, microscopic examinations and tensile tests and software analysis. The results showed that firstly, the hardness results are well proportional to the results of tensile properties of alloys and secondly, the strength of the alloy with thermomechanical treatments compared to T6 treatments increased from 492 MPa to 620 MPa and the elongation increased from 8% to 17% and 100 % upgraded. Microstructural investigation and fracture cross section showed that Al3(Sc,Zr) nanoparticles were evenly distributed among MgZn2 particles and the alloy fracture was of semi-ductile type and in the fracture section nanoparticles less than 10 nm were observed at the end of the dimples. Also, the volume fraction of nanoparticles in the whole microstructure of thermomechanical treatment samples was much higher than that of T6 heat treated samples, so that the percentage of Al3(Sc,Zr) sediments from less than 1% in T6 operation to 8.28% in quench-controlled thermomechanical operation (with 50% deformation) has arrived. QI index in thermomechanical treatment samples is 19% higher than T6 samples, so that this index has increased from 641 in T6 operation to 760 in samples under thermomechanical treatment due to sediment morphology, volume fraction of sediments, their uniform distribution in the matrix, and nano sized sediments in samples under thermomechanical treatment.

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“…7050 alloy has one of the highest strengths among Aluminum alloys due to the main ingredients being Zinc and Copper. In addition, it is lightweight and offers a high strength-to-weight ratio, making it an excellent choice for a variety of applications [7]. Despite this, it is observed that these alloys exhibit inadequate mechanical properties in some applications.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical and tribological behavior of hot-pressed mechanically alloyed Al–Zn–Mg–Cu powders

Azimi

¹

,

Fallahdoost

²

,

Nejadseyfi

³

2015

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Effect of strain-modified particles on the formation of fined grains and the properties of AA7050 alloy

Cited by 24 publications

References 30 publications

Effect of thermomechanical treatment of Al-Zn-Mg-Cu with minor amount Sc and Zr on the mechanical properties

Effect of thermomechanical treatment of Al-Zn-Mg-Cu with minor amount Sc and Zr on the mechanical properties

Effect of Minor Amount of Sc on the Thermomechanical Treatment of Al-Zn-Mg-Cu-Zr Alloy

Microstructure, mechanical and tribological behavior of hot-pressed mechanically alloyed Al–Zn–Mg–Cu powders

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