本研究以實驗手法探討使用旋轉壓縮熱壓成形獲得具有微結構與硬度梯度之粉末材料，使用材料為325 mesh純鋁粉。將純鋁粉末裝填於一直徑為20mm之圓柱形容器。在加熱同時，使上模旋轉，而下模受壓縮作用。藉由在壓縮應力中加入剪切應力造成的塑性變形，將金屬粉末材料固化成形，並透過大應變細化材料內部組織。本實驗驗證了旋轉壓縮法用於成形金屬粉末的可行性，使用一字型上模具驅動壓餅旋轉之模具形式，此種模具能更容易成形粉末試片，在取出試片時能有效防止試片破裂，並減輕模具的磨損。後續分別透過金相觀察與硬度試驗，探討各參數對旋轉壓縮成形結果之影響。
純鋁粉末旋轉壓縮固化成形試片，比純鋁實心材料擁有較高的降伏強度。而有施加旋轉作用的試片，相較沒有施加旋轉，僅受單軸壓縮的試片能獲得更高的粉末密度，並且有更高的平均硬度值，其試片內部材料性質分布將會變得具有規律性。透過金相觀察，旋轉使其材料內部晶粒得到了較大的塑性變形，並觀察到耐腐蝕的次微米細晶區的產生。細晶區從接觸面之圓周發生，隨旋轉圈數增加往圓心及垂直方向擴張。提高壓力及提升溫度能獲得較高的平均硬度值，旋轉圈數增加及轉速降低能獲得更均勻之半徑方向之硬度值，也能獲得較大的垂直方向之硬度梯度。

In this study, the powder material with microstructure and hardness gradient was obtained from hot pressing by Rotating Compression.The pure aluminum powder was packed in a cylindrical container having a diameter of 20 mm. While the mold is being heated, the top die is rotated while the bottom die is compressed. The metal powder material is solidified by plastic deformation caused by the addition of shear stress in the compressive stress. And the internal structure of the material is refined by large strain. This experiment verifies the feasibility of the hot pressing of metal powder by Rotating Compression. The flat-blade die is used to drive the pressing pad. The contact end form can better solidify the metal powder, it can effectively prevent the specimen from tearing when the specimens was taken out, and reduce the wear of the mold. The effects of Rotating Compression Forming of each parameter were discussed through metallographic observation and hardness test.
Pure aluminum powder rotating compression specimen has a higher yield strength than pure aluminum solid material. The specimen with a rotating action can obtain a higher density than the specimen which is only uniaxially compressed without rotation. Through the metallographic observation, the internal structure of the material was greatly plastically deformed by rotation, and the generation of the corrosion-resistant submicron fine grain region is observed. The fine-grained zone occurs from the circumference of the contact surface and expands toward the center of the circle and in the vertical direction as the rotation numbers increases. Increasing the pressure and raising the temperature can obtain a higher average hardness value, and the increase in the number of revolutions and the decrease in the rotational speed can obtain a more uniform hardness value in the radial direction and a larger vertical hardness gradient.

論文審定書 i
謝誌 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 viii
表目錄 xii
符號說明 xiii
第一章 緒論 1
1.1 前言 1
1.2 鋁金屬介紹 2
純鋁粉末之特性與製備 2
1.3 粉末冶金 5
1.3.1 粉末冶金原理 5
1.3.2 燒結 5
1.3.3近代金屬粉末的固化成形方式 6
1.3.4現在發展中新型態的粉末固化技術 9
1.3.5 晶粒尺寸效應 11
1.4 旋轉壓縮成形簡介 12
1.4.1旋轉壓縮成形 12
1.4.2製程參數 13
1.5 文獻回顧 13
1.5.1純鋁晶粒細化之相關文獻 13
1.5.2壓縮扭轉加工(CPT)之相關文獻 13
1.5.3高壓扭轉成形(HPT)之相關文獻 14
1.5.4常溫壓縮剪切法(CMOS-RT)之相關文獻 14
1.6 研究動機與論文架構 15
1.6.1研究動機 15
1.6.2論文架構 15
第二章 旋轉壓縮實驗 17
2.1 純鋁粉末旋轉壓縮實驗 17
2.1.1旋轉壓縮機台介紹 17
2.1.2旋轉壓縮機台改裝 19
2.2 旋轉壓縮實驗簡介 20
2.2.1實驗試片之成形材料 20
2.2.2旋轉壓縮實驗參數之設定 20
2.2.3實驗流程 21
2.3 實驗試片成品 23
2.4 實驗試片成分分析 24
2.5 試片密度量測 26
2.6 壓縮試驗 29
2.7 前導實驗 32
第三章 金相觀察備製與結果 36
3.1金相觀察備製 36
3.2垂直面之金相觀察結果 40
第四章 硬度試驗與結果 60
4.1硬度試驗備製 60
4.2垂直面之硬度試驗結果 61
第五章 結論 78
5.1 結論 78
5.2 未來展望與建議 79
參考文獻 80

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