一般放電加工大多使用實心電極來加工，燒結多孔電極之使用較不普遍。本實驗係藉由三種不同鈦基電極(含實心與多孔)，調整電流大小與衝擊係數對鋁合金做放電加工實驗，探討鋁合金經由不同電極、電流、衝擊係數放電加工後的加工特性、表面與斷面元素分析、斷面硬度等特性。希望在各種參數變化下，以期使材料能快速移除，並在加工過程中使工件表面合金化，產生改質層。
實驗結果得知，使用TiN電極的材料移除率、電極消耗率與表面粗糙度皆最大，Ti(25%TiN)電極皆次之，Ti(6Al4V)電極則最低。經由EDS半定量分析，TiN電極加工後之工件表面與斷面Ti元素含量最多，Ti(25%TiN)電極次之，Ti(6Al4V)電極則最低。另外由XRD繞射儀分析，此三種電極加工後之工件表面皆有碳化鋁(AlC)與碳化鈦(TiC)化合物成分。最後做斷面微硬度量測，比較多孔與實心電極對工件表面改質的效果。可得知多孔鈦基電極加工鋁合金較有表面改質效果，工件表面與橫斷面有較多的Ti元素含量，且可改善鋁合金表面的微硬度特性。

Most of the general discharge machining process using solid electrodes. The use of sintered porous electrode is less. The experimental by three different titanium-based electrodes (including solid and porous). Adjust the current size and the impact factor of aluminum alloy EDM experiment. Discuss aluminum through the different electrodes, electric current and impact factor after EDM processing characteristics, Surface with cross-section elemental analysis, Cross-section hardness and other characteristics. We hope that changes various parameters to have quickly remove material. And in the processing process, to the surface alloying, produces a modified layer.
The results indicate that using TiN electrode caused material removal rate, electrode wear rate and surface roughness are the largest, Ti (25% TiN) electrodes are the second, Ti (6Al4V) electrode is the lowest. By EDS analysis, With the TiN electrode EDM workpiece surface and the workpiece cross-section of Ti element content are the largest, Ti (25% TiN) electrodes are the second, Ti (6Al4V) electrode is the lowest. Analyzed by the XRD diffraction, The three kinds of electrode EDM workpiece surface have aluminum carbide (AlC) and titanium carbide (TiC) compound ingredients. Finally, Do the cross-section micro-hardness measurements. Compare porous and solid electrodes on the surface modification effect. Porous titanium-based electrodes that can be processed aluminum alloy are more surface modification effects. Surface and cross-sectional have more elements of Ti content. Aluminum surface can improve the characteristics of the micro-hardness.

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