Microscopic Phase Field Study on the Kinetics of Order-Disorder Transition of APDBs Formed between DO22 Phases during Stress Aging

2014 ◽  
Vol 789 ◽  
pp. 530-535 ◽  
Author(s):  
Ming Yi Zhang ◽  
Guang Quan Yue ◽  
Jia Zhen Zhang ◽  
Kun Yang ◽  
Zheng Chen
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Domain Boundary ◽  
Phase Field Model ◽  
Antiphase Domain ◽  
Phase Layer ◽  
Disorder Transition ◽  
Disordered Phase ◽  
Kinetics Of ◽  
Microscopic Phase Field Model

Kinetics of order-disorder transition at antiphase domain boundary (APDB) formed between DO22 (Ni3V) phases during stress aging was investigated using microscopic phase field model. The results demonstrated that whether order-disorder transition happens or not depends on the atomic structure of the APDB. Accompanied with the depletion of V and enrichment of Ni and Al, order-disorder transition happened at the APDB (001)//(002). Whereas at the APDB {100}·1⁄2[100], which remains ordered with temporal evolution, Ni and Al enrich and V depletes. Composition evolution of APDB with order-disorder transition favors the nucleation of the L12 and disordered phase. Some of the grains grew bigger while the others disappeared, accompanying the formation of disordered phase layer during order-disorder transition of APDBs, and the order-disorder transition of APDBs can be considered as accompanying process of coarsening of ordered domain phases and growth of disordered phases.

Kinetics of Order-Disorder Transition of Antiphase Domain Boundary Formed between DO22 Phases: Microscopic Phase-Field Study

2010 ◽  
Vol 160-162 ◽  
pp. 996-1000
Author(s):  
Ming Yi Zhang ◽  
Kun Yang ◽  
Zheng Chen
Keyword(s):  
Phase Field ◽  
Domain Boundary ◽  
Phase Field Model ◽  
Antiphase Domain ◽  
Precipitation Process ◽  
Second Phase ◽  
Phase Layer ◽  
Disorder Transition ◽  
Disordered Phase ◽  
Kinetics Of

Based on the microscopic phase-field model, the precipitation process of Ni75Al4.3V20.7 alloy at 1190K is simulated, and the kinetics of order-disorder transition at antiphase domain boundary (APDB) formed between DO22 (Ni3V) phases is investigated. After the ordered APDB formed by the impingement of growing DO22 (Ni3V) domains, the order-disorder transition at APDB is happened. Accompanied with the enrichment of Ni and Al at the APDB, the ordered APDB transforms into a thin disordered phase layer. The second phase L12 nucleates at the order-disorder interface between DO22 and disordered phases, and grows along the disorder phase layer quickly. The order-disorder transition at the ordered APDB accelerates the nucleation and growth of L12 phase at the APDB. The disordered phase caused by the order-disordered transition can be considered the transient phase during the precipitation process of L12 phase.

Microscopic Phase-Field Simulation of the Order-Disorder Transition of Antiphase Domian Boundary Formed between DO22 Phases

2010 ◽  
Vol 44-47 ◽  
pp. 3736-3740
Author(s):  
Ming Yi Zhang ◽  
Kun Yang ◽  
Zheng Chen
Keyword(s):  
Phase Field ◽  
Domain Boundary ◽  
Phase Field Model ◽  
Antiphase Domain ◽  
Precipitation Process ◽  
Second Phase ◽  
Phase Layer ◽  
Disorder Transition ◽  
Disordered Phase ◽  
Microscopic Phase Field Model

The order-disorder transition at antiphase domain boundary (APDB) between DO22 (Ni3V) phases is investigated using the microscopic phase-field model. After the formation of ordered APDB, the order-disorder transition at APDB is happened, and the ordered APDB transforms into a thin disordered phase layer. Accompanied with the enrichment of Ni and Al at the disordered APDB, the second phase L12 nucleates at the order-disorder interface between DO22 phases and grows along the disordered phase layer. The order-disorder transition at the ordered APDB makes the nucleation and growth of the second phase L12 much easier and faster. The disordered phase caused by the order-disorder transition at the APDB can be considered as the transient phase during the precipitation process of L12 phase.

The Simulation of Stress-Induced Phase Transition of L10 Re-Precipitation Based on Microscopic Phase-Field Model

2011 ◽  
Vol 689 ◽  
pp. 226-234
Author(s):  
Yong Xin Wang ◽  
Yong Biao Wang ◽  
Zheng Chen ◽  
Yan Li Lu
Keyword(s):  
Phase Transition ◽  
Induction Period ◽  
Phase Field ◽  
Field Model ◽  
Large Range ◽  
Phase Field Model ◽  
Precipitation Process ◽  
Phase Precipitation ◽  
Microscopic Phase Field Model ◽  
Precipitation Phase

It is common that the pre-precipitation phase with kinetics advantage is found during non-equilibrium transformation. The continuously changed stress in the transformation increases the complication of precipitation process. The stress induces Ll0pre-precipitation phase in Ni75-Al12.5-V12.5alloy is studied by microscope phase-field model in this paper. It is particularly show that Ll2phase precipitates directly without stress. There is no Ll0phase to be found in the disordered matrix. Oppositely, Ll0phase precipitates firstly with stress, and then it turns into Ll2phase. When stress is less, either or both above situations are observed. While stress is stronger, a large range of Ll0phase precipitates firstly. Then a part of it dissolves. The rest turns into Ll2phase. The precipitation of pre-precipitation phase accelerates the precipitation process. The larger the stress and the more Ll0phase precipitation, the longer it exists and the shorter the induction period is.

Evolution kinetics of interstitial loops in irradiated materials: a phase-field model

2011 ◽  
Vol 20 (1) ◽  
pp. 015011 ◽  
Author(s):  
Shenyang Hu ◽  
Charles H Henager ◽  
Yulan Li ◽  
Fei Gao ◽  
Xin Sun ◽  
...  
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Kinetics Of

Microscopic Phase Field Study on the Site Preference of Al in Ni3V: Coordination Geometry Effect

2011 ◽  
Vol 689 ◽  
pp. 149-153 ◽  
Author(s):  
Ming Yi Zhang ◽  
Zheng Chen ◽  
Xiao Li Fan ◽  
Yong Xin Wang ◽  
Yan Li Lu
Keyword(s):  
Field Study ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Alloying Elements ◽  
Diffusion Equations ◽  
Site Preference ◽  
Coordination Geometry ◽  
Geometry Effect ◽  
Microscopic Phase Field Model

The site occupation behavior of Al in Ni3V phase with a DO22structure in Ni75AlxV25-xalloy was studied using the microscopic phase-field model which is based on the microscopic diffusion equations. Attribute to the coordination geometry effects, the concentration of Al are non-equal on the two non-equivalent Ni sites, and Al prefers to occupy the NiⅠsites. However, the Al does not prefer to occupy both of the two Ni sites, because the Al concentration on V site is intermediately between that on NiⅠand NiⅡsite. The calculated ordering energies suggest that the site preference of alloying elements are all energetic favorable.

A physics-based mesoscale phase-field model for predicting the uptake kinetics of radionuclides in hierarchical nuclear wasteform materials

2019 ◽  
Vol 159 ◽  
pp. 103-109 ◽  
Author(s):  
Y.L. Li ◽  
B.D. Zeidman ◽  
S.Y. Hu ◽  
C.H. Henager ◽  
T.M. Besmann ◽  
...  
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Uptake Kinetics ◽  
Kinetics Of
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