| Abstract | 第5-6页 |
| 摘要 | 第7-20页 |
| Table of Major Symbols and Units | 第20-23页 |
| 1 Introduction | 第23-53页 |
| 1.1 Production methods of porous materials | 第23-28页 |
| 1.1.1 Solid state processing of porous metals | 第24页 |
| 1.1.2 Liquid state processing of cellular metals | 第24-28页 |
| 1.2 Features of directionally solidified porous metals("gasar") | 第28-53页 |
| 1.2.1 History of development | 第28-30页 |
| 1.2.2 Scientific basis of gasar production | 第30-31页 |
| 1.2.3 Gasar structure | 第31-41页 |
| 1.2.4 Types of equipment for gasar manufacture | 第41-47页 |
| 1.2.5 Gasar technology current development condition and problems | 第47-49页 |
| 1.2.6 Perspective of gasar materials application in industry | 第49-51页 |
| 1.2.7 The importance and purpose of the chosen topie | 第51-53页 |
| 2 Equipment and experimental procedure | 第53-65页 |
| 2.1 Casting process selection | 第53-54页 |
| 2.2 Experimental equipment and materials | 第54-57页 |
| 2.3 Experimental method | 第57-65页 |
| 2.3.1 Gasar manufacture process flow | 第57-61页 |
| 2.3.2 Gasar sample processing | 第61-62页 |
| 2.3.3 Determination of porosity | 第62-65页 |
| 3 Inflence of hydrogen on the structure of gasar Al | 第65-78页 |
| 3.1 Influence of the hydrogen solubility on the structure of different gasar | 第65-69页 |
| 3.2 Directionally solidified porous pure Al | 第69-78页 |
| 3.2.1 Pore morfology | 第69-74页 |
| 3.2.2 Determination of pore size distribution | 第74-75页 |
| 3.2.3 Porosity,pore diameter, pore length and pore aspect ratio | 第75-77页 |
| 3.2.4 Summary | 第77-78页 |
| 4 Characterization of porous Al gasar alloys structure | 第78-106页 |
| 4.1 Directionally solidified porous Al-Mg alloys | 第78-87页 |
| 4.1.1 Influence of Mg content on the pore structure of Al-Mg gasar alloys | 第78-82页 |
| 4.1.2 Pore size measurement and characteristics | 第82-83页 |
| 4.1.3 Influence of solidification pressure on the porous structure of Al-Mg gasar alloys | 第83-85页 |
| 4.1.4 Influence of Mg content level on the porosity of Al-Mg gasar alloys | 第85-86页 |
| 4.1.5 Summary | 第86-87页 |
| 4.2 Directionally solidified porous Al-Si alloys | 第87-96页 |
| 4.2.1 Pore morphology | 第87-88页 |
| 4.2.2 Pore shape characteristics in dependence of Si content level | 第88-93页 |
| 4.2.3 Influence of Si content level on the porosity of Al-Si gasar alloys | 第93-94页 |
| 4.2.4 Comparison of Al-Si gasar alloys produced by continuous casting technique and mold casting technique | 第94-96页 |
| 4.2.5 Summary | 第96页 |
| 4.3 Directionally solidified porous Al-Cu alloys | 第96-106页 |
| 4.3.1 Macro-micro structure of Al-Cu gasar alloy | 第97-98页 |
| 4.3.2 Influence of Cu content level on the porosity,pore diameter, and pore circularity of Al-Cu gasar alloys | 第98-99页 |
| 4.3.3 Influence of Cu on hydrogen solubility | 第99-100页 |
| 4.3.4 Influence of Cu on mushy zone width | 第100-101页 |
| 4.3.5 Influence of Cu on the primary-precipitated phase | 第101-102页 |
| 4.3.6 Influence of Cu on the pore shape | 第102-105页 |
| 4.3.7 Summary | 第105-106页 |
| 5 Compression results for porous Al gasar alloys | 第106-115页 |
| 5.1 Compression test results for bulk and porous Al-Mg alloys | 第106-108页 |
| 5.2 Compression test results for bulk and porous Al-Si Alloys | 第108-111页 |
| 5.3 Compression test results for bulk and porous Al-Cu alloys | 第111-113页 |
| 5.4 Summary | 第113-115页 |
| 6 Numerical simulation of aluminum and aluminum alloys in gasar fabrication by mold casting technique | 第115-137页 |
| 6.1 Lattice Boltzmann models | 第116-130页 |
| 6.1.1 Purpose | 第116-117页 |
| 6.1.2 Objectives and methods | 第117页 |
| 6.1.3 Multiphase fluid flow described by lattice Boltzmann method | 第117-119页 |
| 6.1.4 Boundary conditions | 第119-120页 |
| 6.1.5 Numerical modelling issues | 第120-121页 |
| 6.1.6 Lattice Boltzmann algorithm for aluminum melting process | 第121-124页 |
| 6.1.7 Validation of LB model | 第124-130页 |
| 6.2 Numerical simulation of natural convection melting in gasar process | 第130-131页 |
| 6.3 Application of Lattice Boltzmann method for Al/Al alloys in gasar process | 第131-134页 |
| 6.4 Comparison of the experimental and numerically simulated porosity | 第134-135页 |
| 6.5 Summary | 第135-137页 |
| 7 Conclusion and Outlook | 第137-140页 |
| 7.1 Conclusion | 第137-138页 |
| 7.2 Outlook | 第138-139页 |
| 7.3 Innovation points | 第139-140页 |
| References | 第140-149页 |
| Research Projects and Publications during PhD Period | 第149-150页 |
| Acknowledgement | 第150-152页 |
| Curriculum Vitae | 第152-154页 |
