Flow stress analysis of ultrafine grained AA 1050 by plane strain compression test

Mohebbi, Mohammad Sadegh; Akbarzadeh, Abdolhamid; Yoon, Young-Ok; Kim, Shae-Kwang

doi:10.1016/j.msea.2013.11.027

Cited by 16 publications

(14 citation statements)

References 38 publications

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“…It is claimed that the microstructural refinement of this specimen during high strain rate deformation of ARB has exceeded the saturated condition achievable by low strain rate deformation of PSC [4].…”

Section: Flow Stress By Pscmentioning

confidence: 94%

“…[5,4]. In order to minimize the friction, the samples and the indenters were finely polished and covered by a PTFE lubricant grease.…”

Section: Mechanical Evaluationsmentioning

confidence: 99%

“…The plastic thinning of the specimens (∆h p ) were subtracted by the elastic displacement of the tools by the method explained in the previously published paper [5]. Regarding the stress, the effect of friction was suppressed by slab analysis with details described in the authors' previous paper [4].…”

Section: Mechanical Evaluationsmentioning

confidence: 99%

“…Low ductility as an inevitable consequence of ARB [3] has been an obstacle for a complete flow analysis of the UFG sheets by conventional tensile testing. To overcome this drawback, the authors have shown that plane strain compression (PSC) test is a good alternative to study the large strain behavior of UFG sheets [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stress relaxation and flow behavior of ultrafine grained AA 1050

Mohebbi

Akbarzadeh

Yoon

et al. 2015

Mechanics of Materials

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Section: Flow Stress By Pscmentioning

confidence: 94%

“…[5,4]. In order to minimize the friction, the samples and the indenters were finely polished and covered by a PTFE lubricant grease.…”

Section: Mechanical Evaluationsmentioning

confidence: 99%

Section: Mechanical Evaluationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stress relaxation and flow behavior of ultrafine grained AA 1050

Mohebbi

Akbarzadeh

Yoon

et al. 2015

Mechanics of Materials

Self Cite

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“…The effect of grain size was elaborated and a hot working processing map was constructed. Although the room-temperature mechanical properties of UFG Al and its alloys have been extensively investigated, [18][19][20][21][22][23][24][25][26] their hot deformation behavior has been infrequently noticed. It should be noted that processing of UFG parts at elevated temperatures can be accompanied by several issues like grain growth, second phase growth, intergranular fracture, and even phase transitions (e.g., crystallization of metastable nano-quasicrystals or precipitation of metastable phases).…”

Section: Introductionmentioning

confidence: 99%

A Processing Map for Hot Deformation of an Ultrafine-Grained Aluminum-Magnesium-Silicon Alloy Prepared by Mechanical Milling and Hot Extrusion

Asgharzadeh

Niazi

Simchi

2015

Metall Mater Trans A

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Uniaxial compression test at different temperatures [573 K to 723 K (300°C to 450°C)] and strain rates (0.01 to 1 s À1 ) was employed to study the hot deformation behavior of an ultrafine-grained (UFG) Al6063 alloy prepared by the powder metallurgy route. The UFG alloy with an average grain size of~0.3 lm was prepared by mechanical milling of a gas-atomized aluminum alloy powder for 20 hours followed by hot powder extrusion at 723 K (450°C). To elaborate the effect of grain size, the aluminum alloy powder was extruded without mechanical milling to attain a coarse-grained (CG) structure with an average grain size of about 2.2 lm. By employing the dynamic materials model, processing maps for the hot deformation of the UFG and CG Al alloy were constructed. For investigation of microstructural evolutions and deformation instability occurring upon hot working, optical microscopy, scanning electron microscopy coupled with electron backscattered diffraction and transmission electron microscopy were utilized. It is shown that the grain refinement increases the deformation flow stress while reducing the strain hardening and power dissipation efficiency during the deformation process at the elevated temperatures. Restoration mechanisms, including dynamic recovery and recrystallization are demonstrated to control microstructural evolutions and thus the deformation behavior. Coarsening of the grain structure in the UFG alloy is illustrated, particularly when the deformation is performed at high temperatures and low strain rates. The manifestations of instability are observed in the form of cracking and void formation.

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