A Reinvestigation of the Mechanical History on Superplasticity of Zn-22Al-2Cu at Room Temperature

Torres‐Villaseñor, G.; Negrete-Sánchez, J.

doi:10.4028/www.scientific.net/msf.243-245.553

Cited by 14 publications

(11 citation statements)

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“…This implies that a dynamic recovery (DRV) and/or a dynamic recrystallization (DRX) must have taken place during the room temperature mechanical rolling of the alloys. Similar observations concerning deformation softening has been reported by Torres-Villasenor et al [1] and Yeh and Chang [2] in their studies of deformation behaviors in Zn-22 Al-2 Cu and Zn-22 Al. The variations in microhardness with deformation strains in both Zn-Al and Zn-Al-Cu alloys are shown in Fig.…”

Section: Work-softeningsupporting

confidence: 77%

Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys

Yang

Pan

Lee

2009

Journal of Alloys and Compounds

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Section: Work-softeningsupporting

confidence: 77%

Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys

Yang

Pan

Lee

2009

Journal of Alloys and Compounds

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“…4, which also includes comparative data taken from Ref. (7,24,25,28). The region exhibiting large elongations was roughly in good agreement with the region where high m-values were achieved.…”

Section: Resultssupporting

confidence: 61%

Superplasticity at Room Temperature in Zn-22Al Alloy Processed by Equal-Channel-Angular Extrusion

Tanaka

Higashi

2004

Mater. Trans.

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Equal-Channel-Angular extrusion (ECAE) has been conducted at room temperature in order to develop an ultrafine-grained structure in a Zn-22 mass% Al eutectoid alloy. The microstructures had an equiaxed and homogeneously distributed Al-rich and Zn-rich duplex-phase and its average grain size was about 0.35 mm. This alloy exhibited a large elongation of 240% albeit at room temperature and a high strain rate of 10 À2 s À1 . A grain-size-dependent phenomenon was also observed at lower strain rates. The activation energy was close to that for grain boundary diffusion. It was apparent that the deformation behavior at room temperature is consistent with that observed in conventional superplasticity. From the results, it was concluded that the dominant deformation mechanism was grain boundary sliding accommodated by dislocation movement controlled by grain boundary diffusion.

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“…It has been reported that an ultrafine-grained Zn-Al system alloy exhibited significant elongation at room temperature. [16][17][18][19][20][21][22][23][24][25] Very recently, in order to produce large and bulky materials to serve as damping substances in buildings, Makii et al 26) developed a new technique using thermomechanical controlling process (TMCP) technology, and reported that the material had Zn particles 50 nm in diameter and exhibited large uniform elongation even at room temperature. Though SePD processes are efficient for obtaining equiaxed and ultrafinegrained materials, the techniques are not suitable to produce materials large enough for service as seismic dampers.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Deformation Behavior of Zn-22 mass%Al Alloy with Nanocrystalline Structure

et al. 2002

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The deformation behavior near room temperature in Zn-22 mass%Al alloy including nanocrystalline structure produced with Thermo Mechanical Controlling Process (TMCP) technology has been characterized over a wide range of strain rates from 10 −6 to 10 −1 s −1 at temperatures from 273 to 473 K. The microstructure of TMCP produced Zn-22 mass%Al alloy had both a random distribution of equiaxed Al-rich and Zn-rich phases with grain size of 1.3 µm and many nanocrystalline Zn particles in Al-rich phases. Since the flow stress in the deformation near room temperature was much larger than that in superplastic deformation and a maximum m value is only 0.3 (n = 3) at low strain rates below 10 −5 s −1 , the pure superplastic behavior may not be observed near room temperature. However it is noted that the large elongation of ∼ 200% was observed at 10 −5 s −1 . From microstructural observations of the specimens tested in the condition with the m value of 0.3 near room temperature, furthermore, it is considered that grain boundary sliding (GBS) is the dominant deformation process, and the specimen may be fractured by cavitation as well as the conventional superplastic materials. Therefore, it seems that the various factors contribute to the deformation flow at room temperature.

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A Reinvestigation of the Mechanical History on Superplasticity of Zn-22Al-2Cu at Room Temperature

Cited by 14 publications

References 0 publications

Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys

Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys

Superplasticity at Room Temperature in Zn-22Al Alloy Processed by Equal-Channel-Angular Extrusion

Room Temperature Deformation Behavior of Zn-22 mass%Al Alloy with Nanocrystalline Structure

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