添加Ti顆粒對MgZnCa非晶質合金之機械性質研究

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翁培鈞(Pei-chun Wong) 查詢紙本館藏

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機械工程學系

論文名稱

添加Ti顆粒對MgZnCa非晶質合金之機械性質研究
(Mechanical Properties of Magnesium Based Bulk Metallic Glass Composites with the Ti particles)

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摘要(中)

由於醫學的進步，人類開始改善醫療環境及方法，甚至減少手術次數，減輕因醫療手術所產生的痛楚，因此能夠在體內被分解的可生物降解性材料受到了極大的關注。鎂鋅鈣塊狀非晶質合金材料具有較好的機械性質、生物相容性以及均勻的生物降解能力，適合用於骨釘、骨板等骨科植入物，但在室溫下的壓縮變形使得材料呈現粉碎性的破壞，為非常脆性的材料，進一步的應用較為困難。本實驗以Mg60Zn35Ca5為基材，添加球型延性Ti金屬顆粒製成非晶質合金複合材料，添加不同比例Ti顆粒進行壓縮試驗，結果顯示添加Ti金屬顆粒後破壞強度由655MPa提升至1187MPa，且可達到最高5.4%的塑性變形量。鎂基非晶質合金之彈性係數與所添加的Ti顆粒不同，因此能夠吸收裂紋(crack)的能量，阻止其快速傳遞與增生，但因Ti金屬顆粒與MgZnCa非晶質合金基材的附著力不佳，僅能吸收較弱的裂紋能量，但能使較強裂紋的傳遞距離拉長，減緩材料被破壞的時間。

摘要(英)

Due to technology advancements, the medical treatment is being improved. One of being concerned is the attempt to simplify the procedure of implantation surgery, which possibly relieves the pain during the recovering process. The biodegradable material provides an attractive solution which is decomposable in human body with widely attention for decades. MgZnCa bulk metallic glass alloy, which has good mechanical properties, biocompatibility and uniform biodegradability, is suitable for the application in orthopedic implants, for example, the bone screws and bone plates. Unfortunately, such material is quite brittle where further application is limited. In this study, we have successfully synthesized the Ti particles reinforced Mg60Zn35Ca5 bulk metallic glass composites (BMGCs) rod with diameter of 2 mm by injection casting method in an argon atmosphere. The glass forming ability (GFA) and the mechanical properties of these Mg-based BMGCs have been systematically investigated as a function of the volume fraction (Vf) of Ti particles. The results showed that the compressive ductility increased with Vf of Ti particles. The mechanical performance with up to 5.4% compressive failure strain and 1187 MPa fracture strength at room temperature can be obtained for the Mg-based BMGCs with 50 vol.% Ti particles, which suggests that these dispersed Ti particles can absorb the energy of crack and branches the primary crack into multiple secondary crack. Therefore, further propagation of crack is blocked and then enhances the plasticity.

關鍵字(中)

★ 生物降解
★ 生物相容性
★ 裂紋
★ 非晶質合金

關鍵字(英)

★ bulk metallic glass composites (BMGCs)
★ biocompatibility
★ biodegradable
★ crack

論文目次

中文摘要.........................................................................................i
英文摘要.........................................................................................ii
總目錄.............................................................................................iii
圖目錄.............................................................................................vii
表目錄.............................................................................................ix
第一章前言...................................................................................1
1-1 緒論.....................................................................................1
1-2 研究動機.............................................................................3
1-3 研究目的.............................................................................3
第二章理論基礎...........................................................................3
2-1 非晶質合金概述.................................................................4
2-2 非晶質合金發展歷程.........................................................4
2-3 實驗歸納法則.....................................................................7
2-4 非晶質合金製造方法.........................................................8
2-5 非晶質合金熱力學............................................................11
2-5-1 非晶質是平衡的借穩定態..........................................11
2-5-2 玻璃轉換溫度Tg..........................................................12
2-5-3 玻璃形成能力(GFA)指標............................................13
2-5-3-1 簡化玻璃溫度Trg..................................................13
2-5-3-2 γ值..........................................................................14
2-5-3-3 γm值......................................................................15
2-5-3-4 △Tx值......................................................................15
2-6 非晶質合金特性................................................................15
2-6-1 機械性質......................................................................16
2-6-2 耐腐蝕性......................................................................17
2-6-3 磁性質..........................................................................17
2-6-4 抗菌性..........................................................................18
2-6-5 其他性質......................................................................18
2-7 非晶質合金的變形機制....................................................18
2-7-1 剪切轉變區..................................................................18
2-8 添加金屬顆粒之選擇法則................................................19
第三章實驗步驟..........................................................................21
3-1 合金配置............................................................................21
3-2 合金熔煉............................................................................21
3-3 棒材試片製備....................................................................22
3-4 顯微組織分析....................................................................23
3-4-1 光學顯微鏡..................................................................23
3-4-2 X光繞射分析...............................................................24
3-4-3 掃描式電子顯微鏡觀察與能量散射質譜分析..........24
3-4-4 穿透式電子顯微鏡......................................................25
3-5 熱性質分析........................................................................25
3-5-1 示差掃描熱分析儀......................................................25
3-6 機械性質分析....................................................................26
3-6-1 壓縮測試......................................................................26
3-6-2 硬度分析......................................................................27
3-6-3 破壞韌性測試..............................................................27
第四章結果與討論......................................................................29
4-1 顯微組織觀察分析............................................................29
4-1-1 顆粒與顆粒間之關係..................................................29
4-1-2 X光繞射分析................................................................30
4-1-3 壓縮前試片之掃描式電子顯微鏡觀察與成分分析..30
4-1-4 壓縮後試片之掃描式電子顯微鏡觀察......................31
4-2 熱性質分析........................................................................33
4-2-1 非恆溫熱性質分析......................................................33
4-3 機械性質分析....................................................................35
4-3-1 壓縮試驗......................................................................35
4-3-2 硬度試驗......................................................................39
4-3-3 破壞韌性試驗..............................................................39
第五章結論..................................................................................41
參考文獻........................................................................................42

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2012-7-23

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