Superplastic behavior of a 7055 aluminum alloy

Kaibyshev, Rustam; Sakai, Taku; Musin, Fanil; Nikulin, Ilya; Miura, Hiromi

doi:10.1016/s1359-6462(01)01172-1

Cited by 50 publications

(38 citation statements)

References 3 publications

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“…22) The final thickness of the sheet produced via this TMP route was ∼ 1.4 mm. Tensile samples with a 10 mm gauge length and 4 mm width were machined directly from these sheets; the loading axis was parallel to the rolling direction.…”

Section: Methodsmentioning

confidence: 97%

“…The material was the same 7055 aluminum alloy as in the previous study 22) and the TMP applied to this material for grain refinement was already described in details elsewhere. 22) The final thickness of the sheet produced via this TMP route was ∼ 1.4 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Details of the tension tests and optical metallography examinations were described elsewhere. 22) All structural studies were carried out on the longitudinal (tension) and long transverse sections of specimens. For EBSD analysis, the strained samples were mechanically polished and, finally, electropolished in the solution containing 10 ml of perchloric acid and 90 ml buthanol at 10…”

Section: Methodsmentioning

confidence: 99%

“…There was almost no change in the crystallite size in the unrecrystallized regions. 22) Extensive structural changes occur, however, under superplastic deformation. Figure 3 shows microstructures of the 7055 Al deformed to strains of 0.4, 0.7 and 1.7 at 450…”

Section: Microstructural Evolution 331 Optical Microscopymentioning

confidence: 99%

“…22) This alloy had a partially recrystallized structure consisted of bands of recrystallized grains with a mean size of 11 µm alternating with bands of recovered subgrains with a mean size of 2 µm. 22) This material was, therefore, capable for superplasticity in microstructure state being intermediate between two conditions described above. Analysis of microstructural evolution during superplastic deformation of this 7055 alloy allows elucidating the mechanism of CDRX and revealing the role of CDRX in the superplasticity.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Grain Boundary Sliding in Microstructural Evolution during Superplastic Deformation of a 7055 Aluminum Alloy

et al. 2002

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The microstructure evolution in a 7055 aluminum alloy subjected to thermomechanical processing (TMP) was studied at 450 • C anḋ ε = 1.7 × 10 −3 s −1 at which the material exhibits superplastic behavior with a total elongation of 720% and the coefficient m = 0.58. Partially recrystallized initial structure of the as-processed 7055 Al consisted of bands of recrystallized grains with a mean size of 11 µm alternating with bands of recovered subgrains with a mean size of 2 µm. The true stress-true strain curve exhibits a well-defined peak stress, followed by gradual strain softening. The coefficient of strain rate sensitivity, m, remains unchanged at ε ≤ 1 and tends to decrease with strain at ε > 1. The initial microstructure persists near the peak strain. Following strain leads to evolution of initial partially recrystallized structure into uniform fully recrystallized structure due to occurrence of continuous dynamic reactions, i.e. continuous dynamic recrystallization (CDRX). The data of microstructural observation and misorientation analysis show that low-angle boundaries (LAB) gradually convert to high-angle boundaries (HAB) resulting in an extensive flow softening. It was shown that grain boundary sliding (GBS) provides superplastic flow at all strains. Concurrently, GBS plays an important role in the dynamic evolution of new grains facilitating conversion of LABs to HABs.

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Microstructural Evolution 331 Optical Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Role of Grain Boundary Sliding in Microstructural Evolution during Superplastic Deformation of a 7055 Aluminum Alloy

et al. 2002

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High‐Strain‐Rate Superplasticity in Mg–Y–Nd Alloy Prepared by Submerged Friction Stir Processing

et al. 2015

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Superplastic tensile behavior of Mg-Y-Nd alloy prepared by submerged friction stir processing (SFSP) is investigated. Microstructure of the SFSP alloy is mainly composed of fine-grained magnesium grains (%1.3 mm) and homogeneously distributed second-phase particles. Elongations are all above 500% within a wide high-temperature range of 708-758 K at 1 Â 10 À1 s À1 , and an elongation of 549% at 1 Â 10 À1 s À1 is achieved at 758 K. The excellent high-strain-rate superplasticity is attributed to the fine-grained microstructure and high thermal stability during superplastic deformation. Grain boundary sliding is the dominated deformation mechanism during superplastic deformation, and the specimens failed through cavity coalescence.

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The study of the technology parameters on the superplasticity of the new Al–Zn–Mg–Cu–Ni–Zr base alloy

Mikhaylovskaya

Котов

Левченко

et al. 2014

Materialwissenschaft Werkst

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Al-Zn-Mg-Cu aluminum alloy contain 0.3% Zr and 4% Ni was processed by traditional hot and cold rolling with a total reduction from 0 to 80%. The relationship between superplastic behavior and reduction of cold deformation and casting cooling rate was analyzed. It is shown that the decrease in the reduction of cold rolling do not significantly influence on flow stress and elongation. Decrease in casting cooling rate leads to insignificantly decrease in superplastic indicators. Alloy exhibits advanced superplasticity: the elongation of 400-800% at the strain rates of (5 × 10 -3 -1 × 10 -1 ) s -1 .

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Superplastic behavior of a 7055 aluminum alloy

Cited by 50 publications

References 3 publications

The Role of Grain Boundary Sliding in Microstructural Evolution during Superplastic Deformation of a 7055 Aluminum Alloy

The Role of Grain Boundary Sliding in Microstructural Evolution during Superplastic Deformation of a 7055 Aluminum Alloy

High‐Strain‐Rate Superplasticity in Mg–Y–Nd Alloy Prepared by Submerged Friction Stir Processing

The study of the technology parameters on the superplasticity of the new Al–Zn–Mg–Cu–Ni–Zr base alloy

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