Effect of T6 Heat Treatment on Microstructure and Hardness of Nanosized Al2O3 Reinforced 7075 Aluminum Matrix Composites

Zhang, Pengxiang; Yan, Hong; Liu, Wei; Zou, Xiuliang; Tang, Binbing

doi:10.3390/met9010044

Cited by 27 publications

(10 citation statements)

References 30 publications

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“…The morphology and size of the massive Al 7 Cu 2 Fe phases show no change during the solution treatment due to its high melting point. While the base alloy shows discontinuity in the arrangement of precipitates in the matrix and along the grain boundary, the alloy after solid solution treatment continuous presence of precipitates in the matrix and along the grain boundary [20].…”

Section: Resultsmentioning

confidence: 95%

Characterization of Tensile Properties and Fracture Toughness of Equal Channel Angular Pressed Al-Zn Alloy

S¹,

Govindaraju²,

Kiran³

2021

Preprint

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Influence of Equal channel angular pressing on mechanical properties and Fracture toughness of Al-Zn alloy were studied in present investigation. Samples are successfully processed using the ECAP technique for up to a four passes by using route A. Al-Zn alloys were heated to a solid solution treatment temperature at 550oC for 2 hours prior to ECAP, this treatment introduces the precipitates which were capable of obstructing motions of dislocation and improves the refinement of the grain during ECAP process Finally, artificial ageing was performed at a temperature of 190°C for 0-20 hours with an interval of 2 hr and specimens are cooledat room temperature with natural air.Fracture toughness was found experimentally for ECAP processed samples using SE (B) specimens according to ASTM E399 standard.Study revealed the enhancement in mechanical properties such as yield strength, ultimate strength and microhardness after four passes by route A technique.The improvement in the fracture toughness properties of artificially aged ECAP samples can also be due to dislocation strengthening, grain boundary strengthening, and the creation of much finer UFG grains, according to the results. Despite the increased tensile strength after ECAP, the ductility behaviour has decreased due to the precipitation of GP zones and dispersion of η, ή, T and E within the Aluminium matrix Furthermore, scanning electron microscope (SEM) micrographs revealed that ductile fracture with large dimples occurred in the artificial aged samples after the ECAP procedure.

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Section: Resultsmentioning

confidence: 95%

Characterization of Tensile Properties and Fracture Toughness of Equal Channel Angular Pressed Al-Zn Alloy

S¹,

Govindaraju²,

Kiran³

2021

Preprint

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“…The distributed Al2O3np particles also inhibited the grain growth tendency during the heat treatment process. 18) Heat treatment given to a material will also engineer the microstructure that is inside a material. 19) In AA 7075, microstructural evolution will occur when heating causes precipitation on the surface of the material.…”

Section: Microstructure Of Composite Using Ommentioning

confidence: 99%

Effect of Nano Al_2O_3 Addition and T6 Heat Treatment on Characteristics of AA 7075 / Al_2O_3 Composite Fabricated by Squeeze Casting Method for Ballistic Application

Miqdad¹,

Syahrial²

2022

Evergreen

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Aluminum alloy AA 7075 majorly consists of Zinc and Magnesium, and it has been known as an alloy with high strength and ability to be heat treated. In regard to that, AA 7075 alloy was investigated to determine its application in military vehicles that require high protection and great mobility capabilities. The addition of Al2O3 can be done to improve the mechanical properties of the material such as hardness and impact toughness that is related to the protective ability of the material. This research was conducted to determine the effect of adding nano Al2O3 and heat treatment on the ballistic resistance of composite plates. The composites were fabricated by the squeeze casting method followed by heat treatment of T6 at 470 °C for two hours, water quench, and artificial aging at 120 °C for one hour. The reinforcement of nano Al2O3 is added to the melted aluminum alloy when the fabrication process takes place as much as 0.1, 0.2, 0.3 wt%. Furthermore, the composite plate was tested by ballistic testing Type II and III according to NIJ standard. Other characterizations were also carried out on the samples such as microstructural observations and hardness testing. The results of the characterization have found that all samples have protective ability in Type II ballistic testing but do not have protective ability in Type III ballistic testing. The addition of reinforcing particles affects the value of the hardness of composite material. Heat treatment increases the hardness value, impacts toughness value, and penetration trace in ballistic testing which has a direct relationship to microstructural changes that occur during the heat treatment process.

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“…In this case, the structure and chemical composition will be in the form of a supersaturated solid solution, that is, α ss , at the temperature after cooling. 19 In aging, the supersaturated solid solution is heated to a temperature lower than the solution temperature and is allowed time so that the additional solution elements to diffuse and form several precipitates. The precipitates grow over time, and the GP semi-stable phases turn into stable equilibrium precipitates θ which are uniformly dispersed on the surface.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Investigation of microstructure, mechanical properties, and wear behavior of A380 aluminum nanocomposite reinforced with SiC nanoparticles produced by powder metallurgy

Mohammadi

Alipour

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this study, the effect of adding SiC nanoparticles and heat treatment on the mechanical properties and wear behavior of A380 aluminum alloy was investigated. Al A380 aluminum powder and SiC nanoparticles with values (0, 0.5, 1, and 2% wt%) were milled in a planetary ball mill with balls of different diameters (4–10 mm) in an argon atmosphere for 10 hours. After the milling process, a hot press (510°C) was used to produce the samples. The microstructure, mechanical properties, and wear behavior of the samples were examined using an optical and scanning electron microscope (SEM), micro Vickers hardness test, and pin-on-disk test, respectively. To investigate the effect of heat treatment, the samples were placed in a furnace at 530°C for 3 hours, then the sample was quenched with boiling water, then placed in a furnace at 175°C for 16 hours, and then by micro Vickers hardness device, the hardness of the samples were measured. The best hardness of the samples was related to aluminum alloy with 0.5 wt% of SiC nanoparticles. Also, after heat treatment, the hardness of the samples increased significantly. Al A380 2wt% SiC nanocomposite sample represents the greatest wear properties when compared with the other experiment samples.

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Effect of T6 Heat Treatment on Microstructure and Hardness of Nanosized Al2O3 Reinforced 7075 Aluminum Matrix Composites

Cited by 27 publications

References 30 publications

Characterization of Tensile Properties and Fracture Toughness of Equal Channel Angular Pressed Al-Zn Alloy

Characterization of Tensile Properties and Fracture Toughness of Equal Channel Angular Pressed Al-Zn Alloy

Effect of Nano Al_2O_3 Addition and T6 Heat Treatment on Characteristics of AA 7075 / Al_2O_3 Composite Fabricated by Squeeze Casting Method for Ballistic Application

Investigation of microstructure, mechanical properties, and wear behavior of A380 aluminum nanocomposite reinforced with SiC nanoparticles produced by powder metallurgy

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