Influence of cryorolling on microstructure and mechanical properties of a cast hypoeutectic Al–Si alloy

Immanuel, R.J.; Panigrahi, S.K.

doi:10.1016/j.msea.2015.06.019

Cited by 56 publications

(17 citation statements)

References 33 publications

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“…Over the past few years, some researchers have reported the impact of grains refinement on the mechanical properties of materials processed by CR . Dasharath and Mula reported that after CR + AN (225°C), the yield strength of Cu‐Al alloy increased 10 times (810 MPa) when compared with the cast alloy (76 MPa).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Recently, Yu et al [18] found that simultaneous grain growth and grain refinement appear in CR-processed UFG Cu sheets, which results in a high-true failure strain of 1.5. A number of studies on CR-processed UFG Al have reported good ductility of the materials [19][20][21]. Immanuel and Panigrahi [19] found that CR resulted in break up and uniform distribution of coarse acicular eutectic particles in the Al matrix, elimination of casting porosity, microstructural refinement and significant accumulation of dislocation density.…”

Section: Introductionmentioning

confidence: 99%

“…A number of studies on CR-processed UFG Al have reported good ductility of the materials [19][20][21]. Immanuel and Panigrahi [19] found that CR resulted in break up and uniform distribution of coarse acicular eutectic particles in the Al matrix, elimination of casting porosity, microstructural refinement and significant accumulation of dislocation density. This resulted in great improvement in the strength (248%) and the ductility (37%) of a cast Al-Si alloy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical properties of ARB-processed aluminum alloy 6061 sheets by subsequent asymmetric cryorolling and ageing

Lü

et al. 2016

Materials Science and Engineering: A

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. (2016). Enhanced mechanical properties of ARB-processed aluminum alloy 6061 sheets by subsequent asymmetric cryorolling and ageing. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, Enhanced mechanical properties of ARB-processed aluminum alloy 6061 sheets by subsequent asymmetric cryorolling and ageing AbstractGrain size and precipitations affect the strength and ductility of ultrafine-grained materials. In this study, aluminum alloy 6061 sheets were fabricated using the accumulative roll bonding (ARB) technique. The ARBprocessed sheets were subsequently subjected to cryorolling and asymmetric cryorolling. The sheets were further aged at 100 °C for 48 h. Mechanical tests show that a combination of asymmetric cryorolling and ageing results in significant improvement in both the ductility and the strength of the ARB-processed sheets. The microstructures of the sheets at different stages of the process were also analyzed using optical microscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction in order to correlate the mechanical properties with the microstructure. Abstract: Grain size and precipitations affect the strength and ductility of ultrafine-grained materials. In this study, aluminum alloy 6061 sheets were fabricated using the accumulative roll bonding (ARB) technique. The ARB-processed sheets were subsequently subjected to cryorolling and asymmetric cryorolling. The sheets were further aged at 100C for 48 hours. Mechanical tests show that a combination of asymmetric cryorolling and ageing results in significant improvement in both the ductility and the strength of the ARB-processed sheets. The microstructures of the sheets at different stages of the process were also analyzed using optical microscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction in order to correlate the mechanical properties with the microstructure.

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“…The particle size of the coarse SiC powders was decreased by increas-ing the milling time. However, fine micron SiC particles around [10][11][12][13][14][15][16][17][18][19][20] μm were detected even after 36 h milling, indicating that not all of the large particles converted to submicron and nanoparticles at prolonged milling time.…”

Section: Discussionmentioning

confidence: 99%

“…Although high-strength aluminum alloys have been developed, the addition of alloying elements and microstructural modification, can be costly, contain toxic elements, and often results in properties, which only result in a slight increase in stiffness. The demands for lightweight, highmodulus, and high-strength materials have therefore led to the development of aluminum matrix nanocomposites (AMNCs) [2,[7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of aluminum matrix composites reinforced with nano- to micrometer-sized SiC particles

et al. 2016

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ab s t r a c tIn this study, the hot extrusion process was applied to stir cast aluminum matrix-SiC composites in order to im-prove their microstructure and reduce cast part defects. SiC particles were ball milled with Cr, Cu, and Ti as three forms of carrier agents to improve SiC incorporation. Large brittle ceramic particles (average particle size: 80 μm) were fragmented during ball-milling to form nanoparticles in order to reduce the cost of composite manufactur-ing. The experimental results indicate that full conversion of coarse micron sized to nanoparticles, even after 36 h of ball milling, was not possible. Multi modal SiC particle size distributions which included SiC nanoparticles were produced after the milling process, leading to the incorporation of a size range of SiC particle sizes from about 50 nm to larger than 10 μm, into the molten A356 aluminum alloy. The particle size of the milled powders and the amount of released heat from the reaction between the carrier agent and molten aluminum are inferred as two crucial factors that affect the resultant part tensile properties and microhardness.

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Influence of cryorolling on microstructure and mechanical properties of a cast hypoeutectic Al–Si alloy

Cited by 56 publications

References 33 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

Enhanced mechanical properties of ARB-processed aluminum alloy 6061 sheets by subsequent asymmetric cryorolling and ageing

Fabrication of aluminum matrix composites reinforced with nano- to micrometer-sized SiC particles

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