scholarly journals Effect of Second Phase Particles on Grain Growth for Nanocrystalline AZ31 Mg Alloy by Phase Field Methods

2015 ◽  
Vol 25 ◽  
pp. 02006
Author(s):  
Yan Wu
Keyword(s):  
Grain Growth ◽  
Phase Field ◽  
Mg Alloy ◽  
Second Phase ◽  
Field Methods ◽  
Second Phase Particles ◽  
Az31 Mg Alloy ◽  
Phase Field Methods

Simulation of the Effect of Second Phase Particles in Different Shapes on Grain Growth of Mg Alloy by Phase Field Methods

2017 ◽  
Vol 727 ◽  
pp. 159-165
Author(s):  
Yan Wu ◽  
Si Xia
Keyword(s):  
Grain Growth ◽  
Phase Field ◽  
Volume Fraction ◽  
Mg Alloy ◽  
Spherical Particles ◽  
Second Phase ◽  
Field Methods ◽  
Second Phase Particles ◽  
Different Shapes ◽  
Phase Field Methods

The effect of second phase particles in different shapes on grain growth of AZ31 Mg alloy has been simulated by the phase field methods under realistic spatial-temporal scales. The long-range orientation field variables are chosen to express the temporal microstructure evolution and crystal orientation. The expression of the local free energy density equation was modified by adding the expression term of second phase particles, and the simulated results show that the grain boundary migration is pinned by the second phase particles during the grain growth, which is agree with the Zener pinning observation. When the shape of particles is different and the volume fraction is 10%, the effect of refining grain is different too, the oval particles are the strongest, followed by the rod particles, and the effect of spherical particles are weaker. The research will help to understand the mechanisms of grain growth containing the second phase particles strengthening.

Grain Growth of Polycrystalline AZ31 Mg Alloy Containing Second Phase Particles by Phase Field Simulation

2016 ◽  
Vol 850 ◽  
pp. 307-313
Author(s):  
Yan Wu ◽  
Si Xia ◽  
Bernie Ya Ping Zong
Keyword(s):  
Particle Size ◽  
Grain Growth ◽  
Phase Field ◽  
Phase Field Model ◽  
Free Energy Density ◽  
Critical Value ◽  
Spherical Particles ◽  
Second Phase ◽  
Pinning Effect ◽  
Second Phase Particles

A phase field model has been established to simulate the grain growth of AZ31 magnesium alloy containing spherical particles with different sizes and contents under realistic spatial-temporal scales. The expression term of second phase particles are added into the local free energy density equation, and the simulated results show that the pinning effect of particles on the grain growth is increased when the contents of particles is increasing, which is consistent with the law of Zener pinning. There is a critical particle size to affect the grain growth in the microstructure. If the size of particles is higher than the critical value, the pinning effect of particles for grain growth will be increased with further decreasing the particle size; however the effect goes opposite if the particle size is lower than the critical value.

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