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[求助]
LAMMPS模拟合金体系 已有1人参与
先介绍一下,我想用LAMMPS模拟CuAl合金,因为Cu和Al都是FCC结构,所以我先用matlab程序建一个多晶纯Cu的二维模型,然后将得到的模型数据文件中的一定比例的原子类型替换成Al原子类型,这样得到的初始的模型如图1(灰色为Cu原子,蓝色为Al原子),然后我将这个模型用LAMMPS计算(npt,300K下relax)后,得到的结果竟然如图2和3,图2是dump0(即relax0步),图3是dump100000(即relax100000步)。请各位LAMMPS届大侠帮忙看一下,这是怎么回事?
我的in文件如下:
# initial conditions
boundary p p p
#processors 4 4 10
dimension 3
units metal
atom_style atomic
neighbor 2.0 bin
neigh_modify delay 10 check yes
# read initial geometry configuration, including atom numbers, atom types, simulation box sizes, atom mass, atom coordinates
read_data poly_crys_lmp.dat
# potentials
pair_style adp
pair_coeff * * Al_Cu.adp Al Cu
# identify a collection of atoms as belonging to this group
group copper type 2
# delete atoms which are too close at the boundary region
delete_atoms overlap 1.0 all all
# calculate Common Neighbor Analysis for each atom
compute 1 copper cna/atom 3.085764
# calculates the pressure of the entire system
compute p all pressure thermo_temp
# define what variables for thermal output
thermo_style custom step temp press c_p[1] c_p[2] c_p[3] vol etotal
thermo 50
timestep 0.002
# energy minimization
min_style cg
minimize 1.0e-6 1.0e-6 100000 100000
reset_timestep 0
# define how to dump a snapshot of atom quantities to one file
dump 1 all custom 50000 dump1.* x y z id c_1
# The simulated samples are relaxed in the isobaric-isothermal ensemble under pressre 0 bar and temperature 300 k
fix 2 all npt temp 300.0 300.0 0.2 x 0.0 0.0 2.0 y 0.0 0.0 2.0 z 0.0 0.0 2.0 couple none
run 50000
write_restart restart.relax100ps
run 50000
write_restart restart.relax200ps
![LAMMPS模拟合金体系]()
1.png
![LAMMPS模拟合金体系-1]()
2.png
![LAMMPS模拟合金体系-2]()
3.png |
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