Effect of cryorolling and annealing on recovery, recrystallisation, grain growth and their influence on mechanical and corrosion behaviour of 6082 Al alloy

Kumar, Nikhil; Rao, P.V.D. Somasekhar; Jayaganthan, R.; Brokmeier, Heinz Günter

doi:10.1016/j.matchemphys.2015.09.014

Cited by 70 publications

(33 citation statements)

References 37 publications

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“…Therefore, these results have shown that the CR + AN sample has the highest relative improvement in the fracture toughness among the samples produced through the 4 different processing routes (ie, CR, RTR, CR + AN, and RTR + AN). The CR + AN sample has ultrafine/coarse grain, small size secondary phase particles, and meta stable β″‐precipitates as discussed in our earlier work . The high relative improvement in the fracture toughness of CR + AN sample could be attributed to the presence of ultrafine/coarse grain, small size secondary phase particles, and meta stable β″‐precipitates.…”

Section: Discussionmentioning

confidence: 57%

“…These small size secondary phase particles in the CR sample obstruct the path for dislocations movement, whereas in the RTR sample, the large size secondary phase particles are responsible for crack nucleation. The reason for high KAM in CR sample is due to suppression of dislocations annihilation by small size secondary phase particles . The LTF region is higher in the RTR sample than in the CR sample, due to strain accumulation which is high during the processing of the CR sample.…”

Section: Discussionmentioning

confidence: 83%

“…To study the influence of crack growth on the microstructure features such as the strain accumulation inside the grains, an EBSD study was done. For the EBSD, the sample surfaces were polished like a mirror before mechanical testing, and after testing, electro‐polishing was performed by using parameters obtained from literature . The area used for the EBSD study in the samples was within the fatigue pre‐crack region.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The severe plastic deformation (SPD) techniques have been used extensively for grain refinement in Al alloys . Cryorolling (CR) has emerged as a new SPD technique, which requires low strain for grain refinement when compared with all other techniques . The CR is performed at liquid nitrogen temperature (−196°C), which helps to restrict dislocation annihilation in materials due to effective suppression of dynamic recovery .…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Cryorolling (CR) has emerged as a new SPD technique, which requires low strain for grain refinement when compared with all other techniques. 4,5 The CR is performed at liquid nitrogen temperature (−196°C), which helps to restrict dislocation annihilation in materials due to effective suppression of dynamic recovery. 4 Furthermore, CR has advantages such as easy operation, high production rate, and convenient set up.…”

Section: Introductionmentioning

confidence: 99%

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Correlation of fracture toughness with microstructural features for ultrafine‐grained 6082 Al alloy

Kumar

Owolabi

Jayaganthan

et al. 2018

Fatigue Fract Eng Mat Struct

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In the present work, cryorolling (CR) and room temperature rolling (RTR) followed by annealing (AN) at 200°C were carried out to investigate the effects of grain size, precipitates (Mg‐Si‐phases), and AlFeMnSi‐phases on the fracture toughness of 6082 Al alloy. Using the values of the conditional fracture toughness, (KQ), in the critical fracture toughness (KIC) validation criteria, it was found that the sample size is inappropriate, which implies that the conditional fracture toughness obtained cannot be considered as the critical fracture toughness. Therefore, to establish the relative improvement in fracture toughness, the equivalent energy fracture toughness (Kee) and J‐integral were calculated and used. The results show that the values of Kee (89.91 MPa √m) and J (89.86 kJ/m2) obtained for the sample processed via CR followed by AN (CR + AN) are the highest when compared with the other samples processed through CR, RTR, and RTR followed by AN, RTR + AN. Microstructural features such as high fraction of low Taylor factor, high fraction of kernel average misorientation, Si‐rich particles, small size AlFeMnSi‐phases, and mixed mode of failure (transgranular shear and micro‐void coalescence) also support the high fracture toughness in the CR + AN sample. It was also observed that the effect of residual stresses on the fracture toughness of CR and RTR samples is minimal. Therefore, the correlation between microstructure and residual stresses is not considered in the present work due to very small values of the residual stresses for CR and RTR samples and the absence of residual stress from the heat‐treated samples.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 83%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Correlation of fracture toughness with microstructural features for ultrafine‐grained 6082 Al alloy

Kumar

Owolabi

Jayaganthan

et al. 2018

Fatigue Fract Eng Mat Struct

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Mechanical and Corrosion Behavior of Al 5083 Alloy Processed by Multi Directional Forging at Cryogenic Temperature

Singh¹,

Rajoria²,

Raykar³

et al. 2022

Optimization of Industrial Systems

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Microstructure, Micro‐Hardness, and Corrosion Resistance of Commercial Purity Al Processed by Hollow‐Cone High‐Pressure Torsion

et al. 2018

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Hollow-cone high-purity commercial Al prepared using copper mold suction casting method is annealed at 600 C, then processed by high-pressure torsion of 0.25 and 0.5 revolutions to produce ultrafine-grained materials. Microstructure, micro-hardness, and corrosion resistance in 3.5% NaCl solution are investigated in this paper. The grain size of the deformed Al after 0.25 and 0.5 revolutions are 1.16 and 0.73 mm, respectively, which are smaller than that of the annealed specimen of 33.46 mm determined using electron backscatter diffraction. The micro-hardness of the deformed Al is two-times larger than that of the annealed specimen. In addition, corrosion resistance of the deformed Al is higher than that of the annealed specimen, which is verified by polarization tests and scanning electron microscopy.

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Effect of cryorolling and annealing on recovery, recrystallisation, grain growth and their influence on mechanical and corrosion behaviour of 6082 Al alloy

Cited by 70 publications

References 37 publications

Correlation of fracture toughness with microstructural features for ultrafine‐grained 6082 Al alloy

Correlation of fracture toughness with microstructural features for ultrafine‐grained 6082 Al alloy

Mechanical and Corrosion Behavior of Al 5083 Alloy Processed by Multi Directional Forging at Cryogenic Temperature

Microstructure, Micro‐Hardness, and Corrosion Resistance of Commercial Purity Al Processed by Hollow‐Cone High‐Pressure Torsion

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