Diffusive phase transformation in a Cu–Zn alloy under rapid heating by electropulsing

2004 ◽  
Vol 84 (5) ◽  
pp. 341-348 ◽  
Author(s):  
Yizhou Z. Zhou ◽  
Wei Zhang ◽  
Jingdong Guo ◽  
Guanhu He
Keyword(s):  
Phase Transformation ◽  
Rapid Heating ◽  
Zn Alloy

Influence of electropulsing on nucleation during phase transformation

2002 ◽  
Vol 17 (12) ◽  
pp. 3012-3014 ◽  
Author(s):  
Yizhou Zhou ◽  
Jingdong Guo ◽  
Wei Zhang ◽  
Guanhu He
Keyword(s):  
Phase Transformation ◽  
Theoretical Model ◽  
Electric Current ◽  
Rapid Heating ◽  
Rapid Cooling ◽  
Electropulsing Treatment ◽  
Zn Alloy ◽  
Good Agreement

Phase transformation about precipitation in a Cu–Zn alloy was studied. It was found that with an electropulsing treatment the number of nuclei during phase transformation could be dramatically enhanced and nucleation of precipitates was more homogeneous. The phenomena did not result from the effect of rapid heating or rapid cooling during electropulsing but resulted from the electric current itself. The results were in good agreement with the theoretical model that electric current can increase nucleation by decreasing the thermodynamic barrier during phase transformation.

Effect of phase transformation and predeformation on creep characteristics of Al–40 wt% Zn alloy

1994 ◽  
Vol 143 (2) ◽  
pp. 297-304 ◽  
Author(s):  
M. M. Mostafa ◽  
R. H. Nada ◽  
F. Abd El-Salam
Keyword(s):  
Phase Transformation ◽  
Creep Characteristics ◽  
Zn Alloy

Elastic and Inelastic Neutron Scattering Studies on the Martensitic Phase Transformation in Cu-39at.%Zn Alloy

1997 ◽  
Vol 66 (4) ◽  
pp. 1033-1043 ◽  
Author(s):  
Yoshihiro Kuroiwa ◽  
Akio Konishi ◽  
Takahisa Shobu ◽  
Yukio Noda ◽  
Kazuhiro Fuchizaki ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Martensitic Phase ◽  
Martensitic Phase Transformation ◽  
Zn Alloy

Phase transformation and microstructural changes during aging process in Ag–Pd–Cu–Pt–Zn alloy

2010 ◽  
Vol 26 (2) ◽  
pp. 203-209 ◽  
Author(s):  
D.-J. Noh ◽  
D.-H. Lee ◽  
M.-H. Cho ◽  
H.-I. Kim ◽  
Y.-H. Kwon ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Aging Process ◽  
Microstructural Changes ◽  
Zn Alloy

Formation of nanocrystalline surface of a Cu–Zn alloy under electropulsing surface treatment

2007 ◽  
Vol 22 (7) ◽  
pp. 1947-1953 ◽  
Author(s):  
X.N. Du ◽  
B.Q. Wang ◽  
J.D. Guo
Keyword(s):  
Grain Size ◽  
Phase Transformation ◽  
Surface Layer ◽  
Surface Treatment ◽  
Skin Effect ◽  
Structure And Property ◽  
Average Grain Size ◽  
Solid State Phase Transformation ◽  
20 Nm ◽  
Zn Alloy

A nanocrystalline surface layer of a Cu–Zn alloy was developed by electropulsing (ECP) surface treatment. The average grain size was about 20 nm on the top surface layer and was gradually augmented with the increase in depth from the top surface. Nanoindentation measurements showed that the hardness was significantly enhanced on the top surface layer compared with the as-annealed Cu–Zn sample. The mechanism for the evolution of this structure and property was related not only to a solid-state phase transformation, but also to the effect of the enhancement of the nucleation rate and the skin effect during the ECP treatment. Therefore, the ECP surface treatment provides a promising method for obtaining surface self-nanocrystallization materials.

Enhanced phase transformation and variant selection by electric current pulses in a Cu–Zn alloy

2014 ◽  
Vol 29 (8) ◽  
pp. 975-980 ◽  
Author(s):  
Xinli Wang ◽  
Wenbin Dai ◽  
Rui Wang ◽  
Xinzhong Tian ◽  
Xiang Zhao
Keyword(s):  
Phase Transformation ◽  
Electric Current ◽  
Variant Selection ◽  
Current Pulses ◽  
Electric Current Pulses ◽  
Image Position ◽  
Zn Alloy

Abstract

Pyrochlore-to-perovskite transformation during rapid heating of sol-gel (Pb,La)TiO3 thin films

1999 ◽  
Vol 14 (11) ◽  
pp. 4302-4306 ◽  
Author(s):  
Miguel Algueró ◽  
M. Lourdes Calzada ◽  
Lorena Pardo
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Thermal Treatment ◽  
Heating Rate ◽  
Lead Titanate ◽  
Perovskite Phase ◽  
Rapid Heating ◽  
Sol Gel ◽  
Pyrochlore Structure ◽  
Gel Method

Phases appearing in lanthanum-modified lead titanate thin films prepared by a diol-based sol-gel method and crystallized by rapid heating were studied. The results clearly indicate that a phase transformation from a pyrochlore structure to the perovskite phase occurs in Pb-deficient films during the thermal treatment, which involves a heating rate higher than 500 °C min−1. The rate of this transformation is a function of the lead content of the films, decreasing as lead volatilizes. Temperatures higher than 650 °C or soak times longer than 2 h make possible the complete pyrochlore-to-perovskite transformation without any lead excess in the films.

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