Superplastic behavior of Zn–Al eutectoid alloy with 2 % Cu

Azpeitia, Mitsuo Ramos; Flores, Esperanza Elizabeth Martínez; Villaseñor, Gabriel Torres

doi:10.1007/s10853-012-6494-z

Cited by 15 publications

(7 citation statements)

References 20 publications

(90 reference statements)

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“…A detailed description on the specimen's preparation and deformation procedures is shown in Ref. 20. True stress and (logarithmic) strains were measured in the tensile tests.…”

Section: Methodsmentioning

confidence: 99%

Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics

Galindo-Nava¹,

Torres‐Villaseñor²,

Rivera-Dı́az-del-Castillo³

2015

Materials Science and Technology

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Plastic deformation by grain boundary sliding in superplastic alloys is described by a novel thermostatistical approach. The Gibbs free energy for cavity formation at moving grain boundaries is obtained. It equals the competition between the stored energy at the boundaries and the energy dissipated by grain boundary sliding. The latter is approximated by an entropy term induced by moving dislocations to facilitate boundary displacement. Strength loss evolution is estimated from the cavity evolution rate. The theory describes superplastic behaviour of Zn22Al, Zn21Al2Cu and Mg3Al1Zn for various temperatures, strain rates, grain sizes, and specimen geometries. Transition maps are defined for finding the optimal conditions for achieving superplastic behaviour in terms of composition, temperature, geometry and strain rate.

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“…A detailed description on the specimen's preparation and deformation procedures is shown in Ref. 20. True stress and (logarithmic) strains were measured in the tensile tests.…”

Section: Methodsmentioning

confidence: 99%

Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics

Galindo-Nava¹,

Torres‐Villaseñor²,

Rivera-Dı́az-del-Castillo³

2015

Materials Science and Technology

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“…The resulting biphasic finegrained microstructure was stabilized by annealing at 250°C for 20 min (Negrete et al, 1995;Ramos Azpeitia et al, 2012). Moreover, it was solidified by continuous casting.…”

Section: Methodsmentioning

confidence: 99%

“…Tension specimens were cut from rolling sheets, and these samples were solubilized by treating them for 1 h at 350°C, followed by a water quench at 15°C. The resulting biphasic fine-grained microstructure was stabilized by annealing at 250°C for 20 min (Negrete et al, 1995; Ramos Azpeitia et al, 2012). After all stages of the thermo-mechanical processing were completed, the alloy had a fine-grained microstructure as shown in Figure 1a.…”

Section: Methodsmentioning

confidence: 99%

Metallographic Preparation of Zn-21Al-2Cu Alloy for Analysis by Electron Backscatter Diffraction (EBSD)

et al. 2014

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Samples of Zn-21Al-2Cu alloy (Zinalco) that will be heavily deformed were prepared using five different manual mechanical metallographic methods. Samples were analyzed before tensile testing using the orientation imaging microscopy-electron backscatter diffraction (OIM-EBSD) technique. The effect of type and particle size during the final polishing stages for this material were studied in order to identify a method that produces a flat, damage free surface with a roughness of about 50 nm and clean from oxide layers, thereby producing diffraction patterns with high image quality (IQ) and adequate confidence indexes (CI). Our results show that final polishing with alumina and silica, as was previously suggested by other research groups for alloys that are difficult to prepare or alloys with low melting point, are not suitable for manual metallographic preparation of this alloy. Indexes of IQ and CI can be used to evaluate methods of metallographic preparation of samples studied using the OIM-EBSD technique.

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“…There have been numerous trials of grain refinement for improving superplastic properties of Zn-22 % Al alloys by means of the techniques of cross-channel extrusion (CCE) [11], equal-channel angular pressing (ECAP) [12], friction stir processing (FSP) [13], high-pressure torsion (HPT) [14] and thermo-mechanical controlling process (TMCP) [15]. These processing techniques led to refine grains of Zn-22 % Al alloys to the submicrometer range so that the alloys exhibited superplastic characteristics including excellent ductility at elevated temperature [16][17][18][19][20][21] and superplastic flow behavior even at room temperature [22][23][24][25][26][27][28][29][30][31]. Recent reports examined the capability of room-temperature superplastic properties in Zn-22 % Al alloys as tuned mass dampers to reduce seismic vibrations in building structures [32,33].…”

Section: Introductionmentioning

confidence: 99%

Achieving room-temperature superplasticity in an ultrafine-grained Zn-22% Al alloy

Uesugi¹,

Takigawa²,

Kawasaki³

et al. 2015

LoM

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The mechanisms of creep and superplasticity occurring in conventional coarse-grained materials are now understood well. However, recent study advances in the production of bulk metals with submicrometer grain sizes which provide the opportunity to demonstrate improved mechanical properties. Thermo-mechanical processing is used in conventional industrial practice to achieve substantial grain refinement in bulk metals whereas the smallest grain sizes achieved in this way are of the order of a few micrometers and generally it is not possible to achieve grain sizes within the submicrometer or nanometer range. In this report, synthesis of an ultrafine-grained Zn-22 % Al eutectoid alloy was demonstrated through solutionizing followed by thermo-mechanical processing. Microstructural investigations revealed there are stable equiaxed ultrafine grain sizes of ~0.63 µm with homogeneous distributions of Zn and Al grains. Tensile testing demonstrated the occurrence of excellent room-temperature superplasticity with a maximum elongation of 400 % at a strain rate of 1.0×10-3 s-1 where the elongation is one of the highest room-temperature superplastic elongation recorded to date in Zn-22 % Al alloy. However, the strain rate sensitivity of superplastic flow was measured as ~0.24 which is lower than the theoretical value of ~0.5 for conventional superplasticity. The present study estimates a threshold stress as one of possible reasons for lowering the strain rate sensitivity of room-temperature superplastic flow in the ultrafine-grained Zn-22 % Al alloy.

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Superplastic behavior of Zn–Al eutectoid alloy with 2 % Cu

Cited by 15 publications

References 20 publications

Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics

Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics

Metallographic Preparation of Zn-21Al-2Cu Alloy for Analysis by Electron Backscatter Diffraction (EBSD)

Achieving room-temperature superplasticity in an ultrafine-grained Zn-22% Al alloy

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