scholarly journals Microstructural changes in a Zn–Al eutectoid alloy modified with 2 wt.% Cu after superplastic deformation

2020 ◽  
Vol 9 (3) ◽  
pp. 5610-5618
Author(s):  
Mitsuo Ramos Azpeitia ◽  
E. Elizabeth Martínez Flores ◽  
Jose Luis Hernandez Rivera ◽  
Gabriel Torres Villaseñor
Keyword(s):  
Superplastic Deformation ◽  
Microstructural Changes ◽  
Eutectoid Alloy

Analysis of Plastic Flow Instability During Superplastic Deformation of the Zn-Al Eutectoid Alloy Modified with 2 wt.% Cu

2017 ◽  
Vol 26 (11) ◽  
pp. 5304-5311 ◽  
Author(s):  
Mitsuo Ramos-Azpeitia ◽  
E. Elizabeth Martínez-Flores ◽  
Jose Luis Hernandez-Rivera ◽  
Gabriel Torres-Villaseñor
Keyword(s):  
Plastic Flow ◽  
Superplastic Deformation ◽  
Flow Instability ◽  
Eutectoid Alloy

A Transmission Electron Microscopy Study of Decomposition in the Zn-Al Eutectoid Alloy

1975 ◽  
Vol 33 ◽  
pp. 26-27
Author(s):  
K. Nuttall
Keyword(s):  
Electron Microscopy ◽  
Superplastic Deformation ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Eutectoid Reaction ◽  
Transmission Electron Microscopy Study ◽  
Β Phase ◽  
Α Phase ◽  
Transmission Electron ◽  
Eutectoid Alloy

There has been considerable interest in the Zn-Al eutectoid alloy in recent years mainly because it exhibits superplastic deformation under certain conditions. A feature of particular importance is that the microstructural requirements for superplasticity can be achieved.in this alloy by heat treatment alone. However in spite of this, the mechanisms of phase transformation have not been widely studied; some aspects of these are described in this paper. The eutectoid reaction takes place at a composition of 78 wt% Zn and a temperature of 276°C by the decomposition of the high temperature γ phase (F.C.C.) to the Zn-rich β phase (C.P.H.) and the Al-rich α phase (F.C.C.) terminal solid solutions. Experiments have mainly involved quenching directly from the γ - phase field and isothermally transforming at various temperatures below 276°C.

Key Microstructural Changes during High Strain Rate Superplastic Deformaion of an Al-Zn-Mg-Cu-Zr Alloy Containing Sc

2011 ◽  
Vol 702-703 ◽  
pp. 366-369
Author(s):  
A.K. Mukhopadhyay ◽  
A. Kumar ◽  
K.S. Prasad ◽  
S. Raveendra ◽  
Indradev Samajdar
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
Considerable Increase ◽  
High Strain ◽  
Al Alloy ◽  
Number Density ◽  
Microstructural Changes ◽  
Early Stages ◽  
Zr Alloy

The changes in texture and microstructure that occur during superplastic deformation (SPD) of a suitably thermo-mechanically processed (TMP) Al alloy AA7010 containing Sc at a temperature and strain rate combination of 475°C, 1.9x10-2s-1 have been examined. It is observed that during the early stages of SPD, there is a significant increase in the Brass {110}<112> component as well as a considerable increase in the S {123}<634> component. Whilst, these components gradually decrease leading to the randomization of texture as the SPD process progresses to larger strains. These results are discussed in terms of the nature of the TMP together with significant variations in the number density of Al3ScxZr1-x dispersoids and percentage recrystallization with strain.

Influence of Stress State on Superplastic Deformation Behavior in a Zn-Al Eutectoid Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 3017-3020 ◽  
Author(s):  
S. Nakano ◽  
Yoshinobu Motohashi ◽  
Goroh Itoh
Keyword(s):  
Flow Stress ◽  
Stress State ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Microstructural Change ◽  
Superplastic Material ◽  
Fine Grained ◽  
Gauge Section ◽  
Tension And Compression ◽  
Eutectoid Alloy

A Zn-Al eutectoid alloy known as a fine-grained superplastic material is tested both in tension and compression under superplastic conditions, and the influence of the stress state on superplastic deformation behavior, such as flow stress, is investigated. In the compression test, deformation is interrupted and turning is performed to remove a barreled portion so that the gauge section becomes uniform, and then the deformation is continued. Microstructural change during the deformation is also investigated. As a result, flow stress in the compression becomes higher than that in tension even after the barreled portion is removed. After deformation, grain growth is observed both in the tension and compression, and growth rate in the compression is larger than in the tension.

Influence of stress states on superplastic deformation behavior in an Al-Zn eutectoid alloy

2002 ◽  
Vol 2002 (0) ◽  
pp. 135-136
Author(s):  
Yasushi SEKINE ◽  
Shuichi NAKANO ◽  
Goroh ITOH ◽  
Yoshinobu MOTOHASHI
Keyword(s):  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Stress States ◽  
Eutectoid Alloy

Effect of Sn Addition on Superplastic Properties of Zn-22mass%Al Eutectoid Alloy

2016 ◽  
Vol 838-839 ◽  
pp. 518-522 ◽  
Author(s):  
Takaomi Itoi ◽  
Fumiyasu Sato ◽  
Yuki Takabayashi ◽  
Mitsuji Hirohashi
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
High Strain ◽  
Rate Sensitivity ◽  
Small Addition ◽  
Microstructure Observation ◽  
Β Phase ◽  
Large Elongation ◽  
Eutectoid Alloy

Superplastic behavior of a Zn 22 mass % Al eutectoid alloy (SPZ) with small addition of Sn (SPZSn) was investigated. Granular grain size of about 0.3 μm was obtained by water quench after annealing SPZ and SPZ05Sn (addition of 0.05 mass % Sn into the SPZ) at 653 K for 2 h. The fundamental microstructure of the SPZ05Sn was similar to that of the SPZ, but, microstructure observation by STEM showed additive Sn was present at the α’ grain boundary in the SPZ05Sn. Excellent high strain rate superplasticity was achieved in the SPZ05Sn, with elongation of more than 1300 % at 523 K at strain rate of 10-1 S-1. Furthermore, large elongation of about 1100 % was recorded at 473 K at strain rate of 10-1 S-1. The large elongation and high strain rate sensitivity value of the SPZ05Sn tend to shift to higher strain rate region as compared to those of the SPZ. It was considered that the small addition of Sn into the SPZ effectively suppressed the grain growth of α and β phase during the superplastic deformation, because granular grains less than 2 μm is maintained after superplastic deformation at 523 K.

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