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研究生: Sikkanthar Diwan Midyeen
Sikkanthar Diwan Midyeen
論文名稱: AZ91鎂複合材料混合奈米SiCp和Bi、 Sb微量元素的微觀結構演變和增強機械性能(拉伸,壓縮,衝擊和疲勞)之研究。
Microstructure Evolution and Strengthening Mechanical (Tensile, Compression, Impact & Fatigue) Properties on Hybrid Nano-SiCp and Micro Elements (Bi & Sb) of AZ91 Magnesium Composite
指導教授: 黃崧任
Song-Jeng Huang
口試委員: 丘群
Chun Chiu
顏怡文
Yen, Yee-wen
曾有志
Yu Chih Tzeng
陳元方
Yuan-Fang Chen
學位類別: 碩士
Master
系所名稱: 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年: 2020
畢業學年度: 108
語文別: 英文
論文頁數: 92
中文關鍵詞: AZ9鎂合金奈米SiCp拉伸壓縮衝擊和疲勞
外文關鍵詞: AZ91 Magnesium alloy, Bismuth, Antimony, Nano-SiCp, Tensile, Compression, Impact & Fatigue
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  • 於這項研究中,添加了奈米SiCp,微米鉍和銻強化項,通過攪拌鑄造法製備出AZ91鎂基複和金屬材料(Mg MMC)並觀察材料顯微組織結構和力學性能。研究加入不同重量百分比的奈米SiCp(0%,0.5%和1%),鉍(1%)和銻(0.4%)。 觀察材料之微觀結構,它清楚地表明,將奈米SiCp添加到鎂基體材料中,複合材料基體的晶粒尺寸有顯著縮小。研究中基於拉伸,衝擊,壓縮和疲勞等數據等等研究,同時通過拉伸,衝擊,壓縮和疲勞測試表面等測試,已確認增強之機械性能,使用掃描電子顯微鏡(SEM)觀察材料,確認了脆性和韌性性質。 從機械測試結果來看,於拉伸,衝擊和疲勞測試中呈現的0.5%納米SiC以及0.5%SiC + 1%Bi + 0.4%Sb奈米可獲得最好的壓縮性和屈服性能。


    In this study, the addition of nano SiCp, micro bismuth and antimony reinforcements were used to develop the microstructural and mechanical properties of as cast AZ91 magnesium metal matrix composites (Mg MMC’s) fabricated by stir casting method. Different weight % of nano SiCp (0%, 0.5% & 1%), bismuth (1%) and antimony (0.4%) were taken into the study. From the microstructure study, it clearly states that addition of nano SiCp into the magnesium matrix significantly reduced the grain size of the matrix of the composites. Enhanced mechanical properties were studied based on the tensile, impact, compression and fatigue data. The brittle and ductile properties were studied by using scanning electron microscopy (SEM) features of tensile, impact, compression and fatigue test surfaces. From the mechanical test results, the best one obtained from which has 0.5% nano SiC presented in tensile, impact and fatigue test as well as nano 0.5%SiC+1%Bi+0.4%Sb has a good compression & yield properties.

    1. TABLE OF CONTENTS Abstract (Chinese)… i Abstract (English)… ii Acknowledgement iii Table of contents v List of figures viii List of tables xi Chapter 1: Introduction 1 1.1 Magnesium 1 1.2 Magnesium alloys 1 1.3 AZ9l magnesium alloy 2 1.4 Tensile behavior of AZ9l alloy 3 1.5 Impact behavior of AZ9l alloy 4 1.6 Compression behavior of AZ9l alloy 5 1.7 Fatigue behavior of AZ9l alloy 6 1.8 Role of minor alloying additions 8 1.9 Theme of the thesis 9 Chapter 2: Literature Review 11 2.1 Introduction 11 2.2 AZ91 (Mg-9% Al-1% Zn-0.2% Mn) Alloy 12 2.3 Effect of alloy compositions 13 2.3.1 Aluminum 13 2.3.2 Zinc 14 2.3.3 Manganese 15 2.4 Role of minor alloying additions 15 2.4.1 Nano SiCp 15 2.4.2 Antimony 16 2.4.3 Bismuth 16 2.5 Literature of Mg alloy reactions with reinforcements on tensile properties 16 2.6 Literature of Mg alloy reactions with reinforcements on impact properties 18 2.7 Literature of Mg alloy reactions with reinforcements on compression properties …………………………………………………………………………………...19 2.8 Literature of fatigue properties in magnesium alloys 19 2.9 Factor influencing the structure and properties of mg-al alloys 21 2.9.1 Discontinuous precipitate 21 2.9.2 Effect of grain size 22 2.10 Summary of literature review 23 Chapter 3: Materials and Experimental Procedure 26 3.1 Flow chart of the process 26 3.2 Experimental materials 27 3.3 Fabrication process 28 3.4 Specimen preparation 31 3.5 Microstructural observation 32 3.5.1 Sample preparation 32 3.6 Optical microscope 33 3.7 Scanning Electron Microscope (SEM) & XRD. 34 3.8 Microhardness test 35 3.9 Density test 36 3.10 Tensile behavior test 36 3.11 Impact behavior test 37 3.12 Compression behavior test 38 3.13 Fatigue behavior test 39 Chapter 4: Results and Discussion 41 4.1 Micro-structural analysis 41 4.2 Mechanical properties 45 4.2.1 Micro-hardness 45 4.2.2 Density & porosity 47 4.2.3 Tensile behavior test 48 4.2.4 Impact behavior test 53 4.2.5 Compression behavior test 56 4.2.6 Fatigue behavior test 59 4.3 Mechanical properties comparision (Tensile, Compression, Impact & fatigue) 62 Chapter 5: Conclusions 64 Chapter 6: References 66

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