Microstructure evolution, mechanical behavior, and fracture analysis of ultrasonic-assisted stir-squeeze cast high strength AA7068/ZrO<sub>2p</sub>/Gr<sub>p</sub> composite under thermal aging

Singh, Ashish Kumar; Soni, Sanjay; Rana, R.S.

doi:10.1080/02726351.2021.1958398

Cited by 13 publications

(8 citation statements)

References 83 publications

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“…The Al6082 alloy melted in an induction furnace at a temperature of 675 °C [8,21]. Once the alloy had melted, 5 to 10 grams of Coveral-11 powder were added to remove impurities [16].…”

Section: Methodsmentioning

confidence: 99%

“…The Al6082 alloys are widely used in automobile industries, i.e. (driving shaft, cylinder head, connecting rods, piston, and brake drum), welding fabrication industries and structural members [21], which need better mechanical properties of the materials. Therefore, more investigations are required to modify mechanical properties further and optimise the material's ductile behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of heat treatment cycle for cast-Al6082 alloy to enhance the mechanical properties

Singh,

Das

2024

Eng. Res. Express

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The present study focused on optimizing the heat treatment cycle for the Al6082 alloy, which is commonly used in the aerospace, automotive, and construction industries. The optimization process consisted of two steps: optimizing the solution and artificial ageing treatments. The as-cast Al6082 alloy samples were solutionised at 480°C, 495°C, and 510°C for 6, 8, and 10 hours, respectively, and quenched in paraffin oil at room temperature (RT). The optimal solution treatment was at 495°C for 8 hours. The optimization of artificial ageing treatment of the optimal solution-treated samples was performed at temperatures of 160°C, 175°C, 190°C, 205°C, and 220°C for 4, 6, and 8 hours, respectively. Microstructural analysis, mechanical characterization, i.e. (tensile strength, % elongation, hardness, and impact strength), and fractography analysis of tensile samples were carried out. The results showed that the optimal ageing cycle was obtained at 205°C for 6 hours. Optimized conditions improved tensile strength (154 MPa to 280 MPa) and hardness (65 BHN to 102 BHN) while slightly increasing the impact energy. However, the % elongation decreased. The study emphasizes the importance of optimizing the heat treatment cycle to meet the desired properties and application requirements of the Al6082 alloy.

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“…The Al6082 alloy melted in an induction furnace at a temperature of 675 °C [8,21]. Once the alloy had melted, 5 to 10 grams of Coveral-11 powder were added to remove impurities [16].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of heat treatment cycle for cast-Al6082 alloy to enhance the mechanical properties

Singh,

Das

2024

Eng. Res. Express

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“…The synthesized matrix alloy, as well as composites, were undergone T6 heat treatment (artificially aging) in an automatic programmable muffle furnace. The heat treatment cycle, schematically shown in figure 3 primarily consists of three stages i.e., (i) Solutionizing: materials are heated at 490 °C  5 °C for 8 h to dissolve the solute elements in the Al solid solution, (ii) Oil quenching: rapid cooling of solutionized materials in an oil bath to achieve supersaturated solid solution and avoid the precipitation of the solute elements, and (iii) Artificial aging: reheating of quenched materials at an optimized aging temperature of 195 °C [27] for 6 h to obtain superior hardening.…”

Section: T6 Heat Treatmentmentioning

confidence: 99%

Sliding wear response of ultrasonic-assisted stir-squeeze cast Al-Zn(-Mg) alloy/ZrO_2p composite: wear mechanism and subsurface deformation

Singh¹,

Soni²,

Rana³

2022

Surf. Topogr.: Metrol. Prop.

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The character of hard ZrO2p in dry sliding wear of Al-Zn(-Mg) alloy was investigated in the cast and heat-treated conditions using pin-on-disc wear tester at fixed sliding speed (3.5 m/sec) and varying applied pressure (0.5-2.125 MPa), giving special accentuation on the response parameters such as seizure resistance, wear rate, and bulk temperature rise. Hardness behavior was also studied for the same concerned materials in accordance with ASTM standards. The composites exhibited enhanced hardness, wear and seizure resistance, and greater temperature rise over the alloy. Indeed, the wear rate at preliminary stages increased with increasing applied pressure up to a transition limit beyond which it upsurged abruptly to greater value at the seizure pressure. Heat treatment also significantly improved the hardness, and resistance to wear and seizure. Amongst, heat-treated composite embedded with 4% ZrO2p yielded the highest hardness of 89 HRB and seizure pressure of 2.125 MPa respectively. The deformation in the subsurface was examined in terms of microhardness variation along the depth perpendicular to the worn surface. It was detected that the presence of ZrO2p not only enhanced the seizure resistance but also effectively hampered the extent of subsurface deformation at the seizure. The wear mechanism was prevalently governed through the establishment of mechanically mixed layer (MML), oxide layer, cracking, and deformed subsurface.

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“…Later artificial aging was performed, in which the samples were heated at 210°C for 8 h and naturally air-cooled. 27,28 The unique codes were given to the samples (shown in Table 1).…”

Section: Experimentationmentioning

confidence: 99%

Investigation of wear and friction characteristic of Al/(Si₃N₄)_np nano composites under as-cast and heat-treated conditions

Kumar

Rana

Purohit

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Several automotive components, such as clutch plate, piston and cylinder liner, etc., require excellent wear characteristics. The current study focused on fabricating nano Si3N4 reinforced Al alloy composites through a stir casting route with ultrasonic assistance, then performing T-6 heat treatment to alter their properties. Dry sliding wear tests were performed to investigate the frictional and wear characteristics at various applied loads and sliding distances. Results reveal that the coarse grain of α-Al was significantly refined after incorporating nano Si3N4 particles in it, and their structure was transformed from coarse columnar to rosette-like dendrites. The hardness and wear resistance increase with nano Si3N4 addition and T-6 heat treatment. The formation of SiO2 and Fe2O3 layers at the interacting interface significantly reduces the coefficient of friction of nanocomposites. The volumetric loss increased with load (15 N to 45 N) and sliding distance (500 m to 3000 m) for cast and heat-treated samples. The maximum volumetric loss was found in the case of as-cast alloy and the minimum for heat-treated Al/2wt.% Si3N4 nanocomposites. The SEM investigation of worn surfaces shows that the adhesive mechanism is more dominant in alloys, whereas the abrasive wear mechanism was associated with nanocomposites.

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Microstructure evolution, mechanical behavior, and fracture analysis of ultrasonic-assisted stir-squeeze cast high strength AA7068/ZrO_2p/Gr_p composite under thermal aging

Cited by 13 publications

References 83 publications

Optimization of heat treatment cycle for cast-Al6082 alloy to enhance the mechanical properties

Optimization of heat treatment cycle for cast-Al6082 alloy to enhance the mechanical properties

Sliding wear response of ultrasonic-assisted stir-squeeze cast Al-Zn(-Mg) alloy/ZrO_2p composite: wear mechanism and subsurface deformation

Investigation of wear and friction characteristic of Al/(Si₃N₄)_np nano composites under as-cast and heat-treated conditions

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Microstructure evolution, mechanical behavior, and fracture analysis of ultrasonic-assisted stir-squeeze cast high strength AA7068/ZrO2p/Grp composite under thermal aging

Cited by 13 publications

References 83 publications

Optimization of heat treatment cycle for cast-Al6082 alloy to enhance the mechanical properties

Optimization of heat treatment cycle for cast-Al6082 alloy to enhance the mechanical properties

Sliding wear response of ultrasonic-assisted stir-squeeze cast Al-Zn(-Mg) alloy/ZrO2p composite: wear mechanism and subsurface deformation

Investigation of wear and friction characteristic of Al/(Si3N4)np nano composites under as-cast and heat-treated conditions

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Microstructure evolution, mechanical behavior, and fracture analysis of ultrasonic-assisted stir-squeeze cast high strength AA7068/ZrO_2p/Gr_p composite under thermal aging

Sliding wear response of ultrasonic-assisted stir-squeeze cast Al-Zn(-Mg) alloy/ZrO_2p composite: wear mechanism and subsurface deformation

Investigation of wear and friction characteristic of Al/(Si₃N₄)_np nano composites under as-cast and heat-treated conditions