Superplastic behavior of a fine-grained ZK60 magnesium alloy processed by high-ratio differential speed rolling

Kim, W.J.; Kim, M.J.; Wang, J.Y.

doi:10.1016/j.msea.2009.08.064

Cited by 64 publications

(18 citation statements)

References 16 publications

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“…One of the major requirements for superplasticity at a low temperature is grain refinement [35]. For example, Mg-Al and Mg-Zn system alloys that have a grain size of 3-20 mm are superplastic at temperatures of $573-673 K [3], whereas the alloys that have much smaller grain sizes of $1 mm are superplastic even at a low temperature of $ 473 K [36][37][38][39][40][41][42][43]. However, the reduction in grain size is insufficient for achieving low-temperature superplasticity.…”

Section: Significance Of Alloying Constituent In Superplastic Magnesimentioning

confidence: 99%

Grain boundary relaxation in fine-grained magnesium solid solutions

Watanabe

Owashi

Uesugi

et al. 2011

Philosophical Magazine

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Grain boundary relaxation at elevated temperatures in fine-grained pure magnesium and Mg-Al solid solutions was investigated by measuring damping capacity at low frequencies. A sharp increase in damping capacity caused by grain boundary relaxation was observed at above a certain temperature. The onset temperature depended on aluminum content; the onset temperature increased with aluminum content. It was demonstrated that aluminum was effective in suppressing grain boundary relaxation in magnesium alloys. However, additional measurement of the damping capacity of a dilute Mg-Y alloy revealed that yttrium was more effective in suppressing grain boundary relaxation.

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Section: Significance Of Alloying Constituent In Superplastic Magnesimentioning

confidence: 99%

Grain boundary relaxation in fine-grained magnesium solid solutions

Watanabe

Owashi

Uesugi

et al. 2011

Philosophical Magazine

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“…The dominant presence of (a) Mg-Zn-based nanoscale rod intermetallic (lying parallel to the c-axis of the HCP unit cell) and (b) Mg-Zn based nanoscale disc intermetallic (lying parallel to the basal plane of the HCP unit cell) in Mg-Zn systems is well known [1,27]. The compressive shear buckling of Mg-Zn-based nanoscale rod/disc intermetallic induced a significantly lower limit on the strengthening factors pertaining to reinforcement (as just described in the paragraph before this).…”

Section: Tensile and Compressive Behaviormentioning

confidence: 99%

Adding TiC Nanoparticles to Magnesium Alloy ZK60A for Strength/Ductility Enhancement

Paramsothy

Chan²,

Kwok³

et al. 2011

Journal of Nanomaterials

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ZK60A nanocomposite containing TiC nanoparticles was fabricated using solidification processing followed by hot extrusion. The ZK60A nanocomposite exhibited similar grain size to monolithic ZK60A and significantly reduced presence of intermetallic phase, reasonable TiC nanoparticle distribution, nondominant (0 0 0 2) texture in the longitudinal direction, and 16% lower hardness than monolithic ZK60A. Compared to monolithic ZK60A (in tension), the ZK60A nanocomposite simultaneously exhibited higher 0.2% TYS, UTS, failure strain, and work of fracture (WOF) (+13%, +15%, +76%, and +106%, resp.). Also, compared to monolithic ZK60A (in compression), the ZK60A nanocomposite exhibited lower 0.2% CYS (−17%) and higher UCS, failure strain, and WOF (+11%, +29%, and +34%, resp.). The beneficial effect of adding TiC nanoparticles on the enhanced tensile and compressive response of ZK60A is investigated in this paper.

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“…A number of investigations have identified that the excellent superplasticity in the ZK60 alloy could be obtained by the severe plastic deformation methods, such as equal channel angular pressing (ECAP), high ratio differential speed rolling (HRDSR) and isothermal rolling. [1][2][3][4][5][6] Figueiredo and Langdon 1) reported an extraordinarily large elongation of 3050% in ECAP ZK60 alloy at 200 C and a strain rate of 1 Â 10 À4 s À1 . Moreover, Lapovok et al 2) achieved a large elongation of 2040% in ECAP ZK60 alloy at 220 C and a strain rate of 3 Â 10 À4 s À1 .…”

Section: Introductionmentioning

confidence: 99%

“…4) Generally speaking, improving the thermal stability of ZK60 alloy can increase the strain rate of superplastic deformation. Kim et al 5,6) reported that the HRDSR ZK60 alloy exhibited a maximum elongation of 926% at relatively high temperature of 280 C and a high strain rate of 1 Â 10 À2 s À1 . In the HRDSR ZK60 alloy, an excellent thermal stability was achieved due to the enhanced fraction of high angle grain boundaries (HAGBs).…”

Section: Introductionmentioning

confidence: 99%

Superplastic Behavior of Friction Stir Processed ZK60 Magnesium Alloy

Xie

Luo

et al. 2011

Mater. Trans.

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Six millimeter thick extruded ZK60 magnesium alloy plate was subjected to friction stir processing (FSP) at 400 rpm and 100 mm/min, producing fine and uniform recrystallized grains with predominant high-angle grain boundaries of 73%. Maximum elongation of 1800% was achieved at a relatively high temperature of 325 C and strain rate of 1 Â 10 À3 s À1 . Grain boundary sliding was identified to be the primary deformation mechanism in the FSP ZK60 alloy by superplastic data analyses and surface morphology observation. The superplastic deformation kinetics of the FSP ZK60 alloy was faster than that of the high-ratio differential speed rolled ZK60 alloy.

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Superplastic behavior of a fine-grained ZK60 magnesium alloy processed by high-ratio differential speed rolling

Cited by 64 publications

References 16 publications

Grain boundary relaxation in fine-grained magnesium solid solutions

Grain boundary relaxation in fine-grained magnesium solid solutions

Adding TiC Nanoparticles to Magnesium Alloy ZK60A for Strength/Ductility Enhancement

Superplastic Behavior of Friction Stir Processed ZK60 Magnesium Alloy

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