臺灣博碩士論文加值系統

利用XRD、SEM、DSC及微硬度計對Al87Y8Ni5-xMnx (x=0, 1 and 2 at.%) 及Al87-xY8Ni5Mnx(x=1, 2, 3 and 4 at.%) 之非晶質合金薄帶進行研究。微量小原子Mn之添加使Al-Y-Ni系統隨意密堆積上升，導致其熱穩定性及機械性質皆上升: 結晶溫度與結晶活化能由Al87Y8Ni5之232°C與158.75 kJ/mole上升至Al84Y8Ni5Mn3之336°C與558.89 kJ/mole；微硬度由Al87Y8Ni5之306 Hv上升至Al84Y8Ni5Mn3之405.5 Hv。Al83Y8Ni5Mn2與Al84Y8Ni5Mn3合金系統之過冷液態區間(ΔTx)分別為28.18 K與36.74 K；γ值分別為0.327與0.358。隨著元素Mn置換元素Al之含量上升，其熱穩定性、過冷液態區間與γ值皆上升。

Al87Y8Ni5-xMnx (x=0, 1 and 2 at.%) and Al87-xY8Ni5Mnx (x=1, 2, 3 and 4 at.%) amorphous alloys was investigated by X-ray diffraction, scanning electron microscope and differential scanning calorimetry. With adding minor amount of small atom Mn, increase the random dense packing of Al-Y-Ni alloy, enhancing the thermal stability and mechanical property. The crystallization temperature and activation energy of crystallizaton have increase from 232°C and 158.75 kJ/mole to 336°C and 558.89 kJ/mole respectively, for the Al87Y8Ni5 amorphous alloy to Al84Y8Ni5Mn3 amorphous alloy; the microhardness increase from 306 Hv to 405.5Hv for the Al87Y8Ni5 amorphous alloy to Al84Y8Ni5Mn3 amorphous alloy. The supercooled liquid region and the γ value of the Al83Y8Ni5Mn2 amorphous alloy and Al84Y8Ni5Mn3 amorphous alloy are in an order of 28.18 K, 36.74 K, 0.327 and 0.358 respectively. In summary, with increasing the content of Manganese enlarge the supercooled liquid region and the γ value.

摘要 i
ABSTRACT ii
致謝 iv
目錄 v
圖目錄 viii
表目錄 xii
第一章 緒論 1
1.1 前言 1
1.2 研究目的與動機 4
第二章 理論基礎與文獻回顧 10
2.1 塊狀非晶質合金之種類 10
2.2 非晶質合金形成理論 12
2.2.1 A.Inoue三大經驗法則 12
2.3 評估玻璃形成能力之參數 14
2.3.1 臨界冷却速率(Rc)與臨界尺寸(Dmax) 14
2.3.2 過冷液態區間 15
2.3.3 簡約玻璃轉換溫度 16
2.3.4 深共晶點 17
2.3.5 γ參數 18
2.3.5.1 TTT曲線在溫度軸之平均位置與液相之穩定性 19
2.3.5.2 TTT曲線在時間軸之位置 19
2.3.5.3 推導γ參數 20
2.3.6 γm參數 28
第三章 實驗方法與流程 30
3.1 實驗流程 30
3.2 試片製備 30
3.2.1 母合金成分配製 30
3.2.2 母合金熔煉 31
3.2.3 合金薄帶製備 32
3.3 材料分析 34
3.3.1 X-ray繞射儀(XRD) 34
3.3.2掃描式電子顯微鏡(SEM)與能量分散質譜儀(EDS) 35
3.3.3示差掃描熱分析儀(DS C) 35
3.3.3.1 非恆溫分析 36
3.3.4 微硬度測試 37
第四章 結果與討論 38
4.1 元素Mn置換元素Ni : Al87Y8Ni5-xMnx 38
4.1.1 母合金鑄錠結構分析 39
4.1.2 合金薄帶結構分析與成分分析 41
4.1.3 熱性質分析 44
4.1.3.1 非恆溫熱性質分析 44
4.1.3.2 一般之非恆溫分析法-Kissinger plot 45
4.1.4 合金薄帶微硬度分析 46
4.2 元素Mn置換元素Al: Al87-xY8Ni5Mnx 49
4.2.1 母合金鑄錠結構分析 49
4.2.2 合金薄帶結構分析與成分分析 51
4.2.3 熱性質分析 54
4.2.3.1 非恆溫熱性質分析 54
4.2.3.2 一般之非恆溫分析法-Kissinger plot 57
4.2.4 熱處理 59
4.2.5 合金薄帶微硬度分析 61
第五章 結論 64
第六章 參考文獻 66

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