在鎂中加入釔（Y）可以提高屈服強(qiáng)度和延展性,然而其機(jī)理尚不明確。采用模擬的方法可以更加有效的理解變形過程中Y元素的作用。本文采用了晶體塑性的快速傅里葉變換方法（CPFFT）模擬了原位拉伸過程中Mg-3wt.%Y合金在晶粒尺度的變形行為。結(jié)果表明,CPFFT成功預(yù)測了拉伸曲線,并可以預(yù)測特定晶粒在不同加載步下的取向演變和應(yīng)力演變。相比于基于位錯的彈性粘塑性自洽（EVPSC）模型,CPFFT有效的預(yù)測晶粒中的晶粒旋轉(zhuǎn)和應(yīng)力變化。最后,對模擬結(jié)果與實(shí)驗(yàn)結(jié)果在晶粒旋轉(zhuǎn)和應(yīng)力方面的誤差原因進(jìn)行了討論 

【文章來源】：上海交通大學(xué)上海市 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：76 頁

【學(xué)位級別】：碩士

【文章目錄】：
摘要
ABSTRACT
Chapter 1: Introduction
Chapter 2: Bibliography about Crystal plasticity theory and model
    2.1 Crystal plasticity commonly used theory
    2.2 Crystal plasticity using The Dusseldorf Advanced Material Simulation Kit (DAMASK)
    2.3 Full field model working with DAMASK
        2.3.1 Crystal Plasticity Finite Element Model (CPFEM)
        2.3.2 Crystal Plasticity Fast Fourier Transform Model (CPFFT)
    2.4 Mean field approach: Elastic viscoplastic self-consistent model
Chapter 3: Input and constitutive framework for the model
    3.1 Sample properties and experiment data
    3.2 Generation of the sample microstructure
    3.3 Input parameters
Chapter 4: Results and discussion
    4.1 Macroscopic deformation
    4.2 Mesoscale deformation
    4.3 Statistical analysis of the stress in each grain
        4.3.1 Stress evolution in every grain
        4.3.2 Efficiency of the simulation of every grain
Chapter 5: Going further to improve the model accuracy
    5.1 Analyzing input parameters to understand the difference of grain simulation results
    5.2 Influence of grain definition
    5.3 Discussion and recommendation for future studies
Chapter 6: Conclusion
Acknowledgment
Reference
Appendix : Grains COMS positions, Euler angle and radius



本文編號：3318333