Matlab界面扩散下 Ni-Al合金析出相粗化规律
毕业论文关键词 镍铝合金，沉淀相，相场方法，微观组织，粗化行为
Title The coarsening rule of Ni-Al alloy precipitation in the
interface diffusion
Abstract
Ni-based superalloy not only has good high temperature strength,
toughness, fatigue resistance performance, also has good corrosion
resistance to oxidation and thermal performance, widely used in aviation,
aerospace and other fields. Organization shape, size, volume fraction and
the space distribution of strengthen-phase in Ni-base superalloy are the
main factors influencing the degree of the alloy strengthening. So,
researching the high temperature Ni-Al alloy’s microstructure and its law
of phase-coarsening plays an important role in all respects to improve the
performance of Ni-Al superalloy.
In this paper, using the phase field method, periodic boundary conditions
and semi implicit Fourier spectrum algorithm, with Fourier space and Cahn
Hilliard the Ginzburg -Landau equation, make a solution for these. Using
phase field equation with Matlab7.0 programming, studied the interfacial
diffusion of temperature, concentration and elastic energy in the process
of Ni-Al alloy precipitation
-phase volume fraction, the influence of
the average particle size and its coarsening behavior patterns.
With the loss of the aging temperature, phase volume fraction, the average
particle size decreases and coarsening rate all decrease; With the increase
of Al concentration, phase volume fraction increases, the average particle
size increases, the coarsening rate increase. Under the action of elastic
energy, phase volume fraction, the average particle size decreases,
coarsening rate decrease.
Keywords Ni-Al alloy，precipitation，phase field method，Microstructure，
Coarsening behavior 目 次
1 绪论 1
1.1 研究背景及意义 1
1.2 计算机模拟研究 2
1.3 相场法组织模拟 . 2
1.4 镍铝二元合金及其强化机理 3
1.4.1 固溶强化机理 3
1.4.2 沉淀强化机理 4
1.4.3 粗化机理 4
1.5 本文研究内容 5
2 相场模型 7
2.1 相场模型理论基础 7
2.2 相场模型 8
2.3 Ni-Al合金相场模型的建立 10
2.3.1 相场控制方程 . 10
2.3.2 Ni-Al合金物性参数 13
2.3.3 数值模拟过程 . 14
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