添加多孔鉬與Ti-6Al-4V顆粒對鎂鋅鈣塊狀金屬玻璃複材熱性質及機械性質之研究

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粘益原(Yi-Yuan Nian) 查詢紙本館藏

畢業系所

材料科學與工程研究所

論文名稱

添加多孔鉬與Ti-6Al-4V顆粒對鎂鋅鈣塊狀金屬玻璃複材熱性質及機械性質之研究
(Study of Thermal and Mechanical Properties of Mg-based Bulk Metallic Glass Composite with Ex-situ Adding Porous Mo and Spherical Ti-6Al-4V Particles)

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至系統瀏覽論文 (2025-8-31以後開放)

摘要(中)

近年來，在生醫用骨釘及縫合鉚釘等骨科植入物中，可降解材料發展尤為重要，鎂基金屬玻璃合金相當受矚目，因為相比傳統生醫材料或是鎂合金，其具有更良好的機械性能、與人體骨骼相似的楊氏係數、良好生物相容性。金屬玻璃是非結晶結構沒有晶界，可以降低材料的分解速率，因此適合骨科植入物。
但是金屬玻璃在常溫下壓縮材料缺乏韌性，影響了後續加工與應用。本實驗選擇具有較佳玻璃形成能力的Mg66Zn29Ca5為基材，分別添加不同體積分率(5~30 vol.%)多孔鉬顆粒與Ti-6Al-4V顆粒製成鎂基非晶質複材，利用外添加顆粒方式達到散佈強化的效果，藉此提升塊狀金屬玻璃之韌性；同時也設計並製成核殼結構(Core-Shell Structure)之棒材，以提高鎂基金屬玻璃棒材之尺寸。
結果顯示經過外添加之複材，均為部分非晶態，但其抗壓強度仍遠高於一般鎂合金，添加Ti-6Al-4V顆粒之非晶複材的破裂韌性並無明顯的改善；添加多孔鉬顆粒之非晶複材，隨著添加量增加至20 vol.%，最大破裂韌性從1.10提升至6.1 MPa‧m1/2，且最大抗壓強度亦能保持613 MPa，並隨著顆粒添加量增加上升進一步提升壓縮應變量，塑性變形量約 10%。而添加多孔鉬顆粒之core-shell複材，保持良好非晶質結構及玻璃形成能力，其破裂韌性為5.66 MPa‧m1/2，最大抗壓強度亦能保持609 MPa，Coreshell結構棒材熱性質與直徑3 mm棒材表現相仿，確實能提升其非晶性及熱性質。

摘要(英)

Mg-based alloys attract lots of attention as biodegradable materials. Mg-based alloys have good mechanical properties, similar Young′s modulus to human bones as well as the good biocompatibility. Mg-Zn-Ca bulk metallic glass material has no grain boundaries which can decrease the degradation rate of the implant material in comparison with Mg alloys and suitable for orthopedic implants.
However, the weakness of metallic glass is brittle which limited the workability via machining. In this study, Mg66Zn29Ca5 with better glass forming ability was selected as the substrate, porous Mo particles and Ti-6Al-4V particles with different volume fractions were added to fabricate Mg-based bulk metallic composites (BMGC). The particles are added to achieve dispersion strengthening and enhance the toughness of the bulk metal glass. At the same time, a core-shell structure rod was designed and fabricated to improve the dimension of BMGC rod.
The optima results occur at 3 mm Mg-Zn-Ca BMGC rods with 20 vol.% porous Mo particles, the fracture toughness increased from 1.10 to 6.1 MPa‧m1/2 and remained the maximum compressive strength of 613 MPa. Meanwhile, the ductility also increased to about 10%.
Due to the limitation of cooling rate, both Mg66Zn29Ca5 BMG and BMGC rods with 4 mm in diameter present only partial amorphous status. Therefore, a novel core-shell structure rod was developed, with pure Mg rod as core and Mg66Zn29Ca5 BMG and BMGC as shell to increase the cooling rate. As a result, 4 mm core-shell BMGCs rods (added with porous Mo particles) maintains a good amorphous structure and glass forming ability. The optimum performance occurs at the 4 mm core-shell rods with 25 vol.% porous Mo particle additions, the fracture toughness increased from 1.5 to 5.66 MPa∙m1/2 and remained the maximum compressive strength of 609 MPa.

關鍵字(中)

★ 生物相容性
★ 生物降解
★ 核殼結構
★ 散佈強化
★ 破裂韌性

關鍵字(英)

★ biocompatibility
★ biodegradation
★ amorphous alloy
★ core-shell structure
★ dispersion strengthening
★ fracture toughness

論文目次

摘要 I
Abstract II
致謝 III
表目錄 VII
圖目錄 VIII
第一章前言 1
1-1 緒論 1
1-2 研究動機 2
1-3 研究目的 2
第二章理論基礎 4
2-1 金屬玻璃合金之概述 4
2-2 金屬玻璃合金之發展歷程 5
2-3 金屬玻璃實驗歸納法則 7
2-4 金屬玻璃之製程 8
2-5 金屬玻璃之熱力學 10
2-5-1 非晶質之介穩態平衡 10
2-5-2 玻璃轉換溫度(Tg) 11
2-5-3 簡化玻璃轉化溫度(Trg) 11
2-5-4 過冷液相區(ΔTx) 12
2-5-5 γ值與γm值 12
2-6 金屬玻璃合金之特性……...……………………………………….…………….13
2-6-1 機械性質 14
2-6-2 抗菌性與耐腐蝕 15
2-6-3 其他性質 15
2-7 鎂基金屬玻璃及其複材之沿革……………….…………………………………15
2-8 塊狀金屬玻璃複合材料的強化機制 16
2-8-1 外添加法 16
2-8-2 內析出法 17
第三章實驗步驟 25
3-1 試片製作 25
3-1-1　鎂基金屬玻璃預熔塊材原料配製 25
3-1-2　鎂合金基材及其複材預熔 26
3-1-3　鎂基金屬玻璃其複材棒材製作 26
3-2 微結構分析 28
3-2-1　光學顯微鏡 28
3-2-2　X光繞射分析 28
3-2-3　掃描式電子顯微鏡與能量分散光譜儀的分析 28
3-3 熱性質分析 29
3-4 機械性質測試 29
3-4-1　硬度測試 29
3-4-2　破壞韌性分析 30
3-4-3　壓縮測試 30
第四章結果與討論 40
4-1 鎂鋅鈣金屬玻璃基材及其複材之3 mm及 4 mm棒材 40
4-1-1 外添加顆粒的實際含量及顆粒之間距離 40
4-1-2 X光繞射分析 41
4-1-3 壓縮前試片SEM表面觀察與EDS成分分析 42
4-1-4 非恆溫熱性質分析 43
4-1-5 硬度及破裂韌性測試 44
4-1-6 壓縮測試 45
4-1-7 壓縮後之破斷面形貌 46
4-2 鎂鋅鈣金屬玻璃基材及其複材之4 mm及core-shell棒材 47
4-2-1 X光繞射分析 48
4-2-2 壓縮前之試片表面形貌與成分分析 49
4-2-3 非恆溫熱性質分析 49
4-2-4 硬度及破裂韌性測試 50
4-2-5 壓縮測試 51
4-2-6 壓縮後之破斷面形貌 52
第五章結論 110
參考文獻 111

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2020-8-13

推文