Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy

Panigrahi, S.K.; Jayaganthan, R.

doi:10.1016/j.jallcom.2011.07.028

Cited by 137 publications

(49 citation statements)

References 42 publications

(51 reference statements)

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“…Cryorolling is a simple low-temperature rolling process in which the low temperature is maintained by liquid nitrogen. The processing also requires a relatively lower load to induce severe strain [12][13][14][15][16][17][18]. Wang et al [12] found that when pure copper was processed by cryorolling, the matrix grains imparted high strength to the samples.…”

Section: Cryorollingmentioning

confidence: 99%

“…The inhomogeneous microstructure was seen to induce strain hardening mechanisms, leading to a high elongation upto 30%. Cryorolling has also been identified as one of the potential routes to produce bulk ultrafine grain Al alloys [13]. The microstructure and mechanical properties of a precipitation-hardened Al-Cu alloy subjected to cryorolling, low temperature annealing and ageing treatments were studied by Rangaraju et al [15], who produced ultrafine grain microstructure with improved tensile strength and good ductility.…”

Section: Cryorollingmentioning

confidence: 99%

“…Before rolling, the sheet was dipped into liquid nitrogen ( À 196 1C) for at least 8 min [13], and the temperature of the workpiece is required to be lower than À 100 1C after each pass [12]. To estimate the temperature rise in the sheet during asymmetric cryorolling, a three-dimensional thermal-mechanical Finite Element (FE) model was set up in LS-DYNA.…”

Section: Experiments and Fe Simulationmentioning

confidence: 99%

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Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

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An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 degrees celcius. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-Cr-Mn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm. An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 1C. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-CrMn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm.

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Section: Cryorollingmentioning

confidence: 99%

Section: Cryorollingmentioning

confidence: 99%

Section: Experiments and Fe Simulationmentioning

confidence: 99%

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Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

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“…The interaction of high-density dislocations enhanced the precipitation capability for producing a high density of nanosized precipitates [10]. Yin et al found nanograins that were less than 500 nm in size in 7075 alloy samples subjected to compression forging at cryogenic temperatures [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys

Shih

Yong

Hsu

2016

Metals

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Abstract:In this study, AA6066 alloy samples were cryogenically forged after annealing and then subjected to solution and aging treatments. Compared with conventional 6066-T6 alloy samples, the cryoforged samples exhibited a 34% increase in elongation but sacrificed about 8%-12% in ultimate tensile strength (UTS) and yield stress (YS). Such difference was affected by the constituent phases that changed in the samples' matrix. Anodization and sealing did minor effect on tensile strength of the 6066-T6 samples with/without cryoforging but it decreased samples' elongation about 8%-10%. The anodized/sealed anodic aluminum oxide (AAO) film enhanced the corrosion resistance of the cryoforged samples.

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“…The 7075 Al alloy, which is one of the 7000 series (Al-Zn-Mg-Cu) ultra-high strength alloys, have been extensively used for structural components in aerospace and automobile industries [3,4]. Generally, the casting methods to produce 7075 Al alloy are simple and economical due to the possibility of utilizing conventional casting equipment without limitation in size and shape of the components [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Minor Sr Modifier on the Microstructures and Mechanical Properties of 7075 T6 Al Alloys

Sun

Wang

et al. 2017

Metals

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Abstract:The influence of a minor strontium (Sr) modifier on the microstructures and mechanical properties of 7075 Al alloys was investigated in this paper. The grain size of cast 7075 Al alloys was refined from 157 µm to 115 µm, 108 µm, and 105 µm after adding 0.05 wt. %, 0.1 wt. %, and 0.2 wt. % Sr, respectively. The extruded 7075 Al alloys was refined with different degrees of Sr modifier. The mechanical properties were optimum when adding 0.1 wt. % Sr. The ultimate tensile strength (σ b ) increased from 573 to 598 MPa and the elongation-to-failure (δ f ) was raised from 19.5% to 24.9%. The microhardness increased from 182 to 195 Hv. The tensile fracture surface via scanning electron microscopy (SEM) revealed a transition from brittle fracture to ductile fracture as Sr increased from 0 wt. % to 0.2 wt. %. The result in this paper proved that the modifier can improve the properties of 7075 Al alloy.

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Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy

Cited by 137 publications

References 42 publications

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys

Effect of a Minor Sr Modifier on the Microstructures and Mechanical Properties of 7075 T6 Al Alloys

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