本實驗是利用電鍍製作純鎳與兩種鈷含量（15wt% 與40wt%）的鎳鈷合金試片，探討退火溫度對鍍層顯微組織與機械性質的影響。顯微組織的分析主要利用配備背向散射電子繞射儀的掃描式電子顯微鏡和穿透式電子顯微鏡。拉伸試驗結果顯示，基本上鍍層的強度隨退火溫度上升而下降，而延伸率則隨退火溫度上升而升高。但是純鎳鍍層在240-260 oC退火後，其強度與220 οC退火的鍍層類似，但是延伸率卻明顯提升，使其強塑積（～13 GPa%）高於未退火試片與其他溫度退火的試片（～8-11 GPa%）。而類似現象則未在鎳鈷合金鍍層觀察到。顯微組織的分析顯示，退火後晶粒內部的差排密度明顯降低，晶粒也略微成長。其中純鎳鍍層出現較明顯的雙峰晶粒分佈現象，粗晶的比例在240-260 oC退火後達到35%至40%。而鎳鈷鍍層在類似溫度退火後，粗晶的比例仍低於20%。換言之，適當比例的雙峰晶粒徑分佈對提升材料的延展性略有幫助。

This work aims at clarifying the effect of post-deposition annealing on the mechanical properties of Ni and Ni-Co samples prepared by electrodeposition. The Co content of the Ni-Co samples is 15wt% and 40 wt%, respectively. The microstructure was characterized by scanning electron microscopy, electron backscattering diffraction and transmission electron microscopy. Tensile tests showed that the strength of the samples decreased with increasing the annealing temperature. The ductility, on the other hand, increased with the annealing temperature. However, the strength of the sample annealed at 240 or 260 oC was very similar to that of the 220 oC annealed one, whereas the ductility of the former increased. Accordingly, the strength-ductility product of the 240 oC- or 260 oC- annealed samples increase from the regular value of 8-11 GPa to 13GPa%. Similar phenomenon has not been observed for the Ni-Co samples. Microstructure analyses indicated that the dislocation density in the grain interior decreased associated with slight growth of grains after anneal. An obvious bimodal distribution of grain size was found for the 240 oC- or 260 oC- annealed samples with 35-40 vol.% of coarse grains. The volume ratio of the coarse grains is less than 20 % after the ni-Co samples were annealed at the same temperatures. Accordingly, grains having a bimodal size distribution improves the ductility of the sample if the volume ratio of the coarse grains reach a critical value.

總目錄
論文審定書 i
中文摘要 ii
英文摘要 iii
總目錄 iv
表目錄 vii
圖目錄 viii
一、前言 1
二、文獻回顧 2
2-1 電鍍原理 2
2-1-1法拉第定律 2
2-1-2 極化 2
2-1-3 直流電鍍與脈衝電鍍 4
2-2 微米與奈米材料的機械性質 5
2-2-1 強度 5
2-2-2 晶界 6
2-2-3 加工硬化 7
2-2-4 提升微奈米材料延展性的方法 8
2-2-5 雙峰晶粒徑分佈與延展性 10
2-2-6 電鍍參數對鍍層之影響 12
2-3 鎳鈷合金機械性質 13
三、實驗方法 15
3-1 實驗流程 15
3-2 電鍍製程 15
3-3 試片加工與退火處理 16
3-4 微硬度量測 16
3-5 EBSD分析 16
3-6 拉伸試驗 17
3-7穿透式電子顯微鏡分析 17
四、實驗結果 18
4-1電鍍試片微硬度及成分分析 18
4-1-1純鎳試片 18
4-1-2鎳鈷試片(Co-15、Co-40) 18
4-2機械性質分析 19
4-2-1純鎳試片 19
4-2-2鎳鈷試片(Co-15) 20
4-2-3鎳鈷試片(Co-40) 21
4-2-4退火溫度分析 22
4-3 EBSD分析 22
4-3-1純鎳試片 23
4-3-2鎳鈷試片(Co-15) 24
4-3-3鎳鈷試片(Co-40) 24
4-4顯微組織分析 25
4-4-1純鎳試片 25
4-4-2鎳鈷試片(Co-15) 25
五、討論 27
5-1機械性質 27
5-2顯微組織及雙峰晶粒徑分佈 27
5-3 晶粒徑量測與Hall-Petch關係式 28
六、結論 30
七、參考文獻 31

七、參考文獻
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