臺灣博碩士論文加值系統

本文將探討不同製程之材料於磨損、拉伸與疲勞試驗下之磨損、抗拉與疲勞性質以及平均應力對於循環壽命之影響。含有碳化鈦顆粒的鋁基複合材料分別通過內在反應法與直接添加法製成。內在反應法是通過含碳氣體與鈦金屬在液體熔體中反應形成TiC。
本研究使用三個鋁基體樣品，（1）鋁合金（Al-5.1Cu-6.2Ti），（2）通過內在反應形成含有TiC顆粒之鋁基複合材料，和（3）通過直接添加形成含有TiC顆粒之鋁基複合材料。通過拉伸試驗比較了三種樣品的拉伸強度，耐磨性，疲勞強度，滑動磨損性。通過內在反應，含TiC顆粒之鋁基複合材料的拉伸強度提高到21％，硬度提高20％。對於鋁基複合材料中直接添加TiC顆粒，拉伸強度提高了15％，硬度提高18％。通過內在反應法形成之TiC顆粒比直接添加法小10倍，並且與鋁基體強烈地結合。因此，含有TiC顆粒之鋁基複合材料通過內在反應形成，具有比其他兩個樣品更好之拉伸性能，耐磨性和疲勞強度。而直接添加TiC顆粒之鋁基複合材料的拉伸性能高於鋁合金。
改變實驗的平均應力(σm)，發現循環壽命(Nf)會大幅下降，研究中亦發現同樣之應力幅(σa)與平均應力(σm)條件，複合材料的降伏強度(σy)越低，完全反向應力(σar)越高，真實破壞強度(σfb)與破壞強度(σ'f)也會越接近，將數據結果繪製成應力幅-平均應力曲線，發現應力幅(σar)主要與真實破壞強度有關。前面提到TiC用不同方法製成鋁基複合材料會改變鋁合金原有的降伏強度，但降伏強度提升不會直接影響完全反向應力(σar)。若材料有裂口之問題存在，其循環壽命將比平均應力不為零之無裂口鋁基複合材料還要更低。

This paper will investigate the effects of wear, tensile and fatigue properties, and average stress on cycle life for materials in different processes under wear, tensile and fatigue tests.The aluminum matrix composite containing titanium carbide particles is produced by in situ reaction and direct addition, The in situ reaction is formed by reacting a carbon- containing gas with titanium in a liquid melt to form TiC.
This study used three aluminum matrix samples, (1) aluminum alloy (Al-5.1Cu-6.2Ti), (2) aluminum matrix composites containing TiC particles formed by in situ reactions, and (3) aluminum matrix composite containing TiC particles by drectly adding. The tensile strength, the wear resistance, the fatigue strength and the sliding wear resistance of the three samples are compared. The tensile strength increased up to 21%, and the hardness increased by 20% for an aluminum matrix composite containing TiC particles by in situ reaction. The tensile strength increased by 15%, and the harness increased up to 18% for the direct addition of TiC particles to the aluminum matrix composites.
The TiC particles formed by the in situ reaction method are 10 times smaller than the direct addition method, and integrate with aluminum matrix strongly. Therefore, Aluminum matrix composites containing TiC particles are formed by in situ reactions has the better tensile properties, wear resistance, and fatigue strength than the other two samples. The tensile properties of the aluminum matrix composite material to which TiC particles are directly added is higher than the aluminum alloy.
By changing the average stress (σm) of the experiment, it was found that the cycle life (Nf) was greatly reduced. The same stress vibration (σa) and average stress (σm) conditions were found in the study. The lower the yield stress (σy) of the composite, the higher complete reverse stress (σar), and the closer the true fracture strength (σfb) is to the fracture strength (σ'f). The data results are plotted as a stress-weak mean stress curve and the stress-vibration (σar) is found to be primarily related to the true failure strength.It is mentioned that the TiC is fabricated of aluminum matrix composites by different methods, which will change the original hardness of the aluminum alloy, but the hardness increase will not directly affect complete reverse stress (σar). If the material has a crack problem, if the material has a crack problem, its cycle life (Nf) will be lower than that of a split-free aluminum-based composite with an average stress of zero.

摘要....................................................................i
Abstract................................................................iii
誌謝....................................................................v
目錄....................................................................vi
表目錄..................................................................ix
圖目錄..................................................................x
第一章 緒論.............................................................1
1.前言..................................................................1
2.研究動機及目的.........................................................2
第二章 文獻探討.........................................................3
2.1鋁合金(Aluminum alloy)...............................................3
2.1.1 鋁合金的簡介......................................................3
2.1.2 鋁合金的特性......................................................3
2.1.3 鋁合金的分類......................................................4
2.2碳化鈦(Titanium Carbide).............................................5
2.2.1 碳化鈦的簡介......................................................5
2.2.2 碳化鈦的特性......................................................5
2.2.3碳化鈦的物理性質...................................................6
2.2.4 碳化鈦的製造方法..................................................6
2.2.5 碳化鈦的用途......................................................7
2.3內在反應.............................................................8
2.3.1 內在反應的原理....................................................8
2.3.2內在反應的製造方法..................................................8
2.5疲勞極限............................................................10
2.6平均應力對疲勞壽命的影響.............................................11
第三章 實驗程序.......................................................14
3.1實驗材料............................................................14
3.1.1粉末材料..........................................................14
3.1.2 實驗設備.........................................................14
3.1.3 分析軟體.........................................................21
3.2實驗步驟............................................................22
3.2.1內在反應法製造....................................................22
3.2.2直接添加法製造....................................................23
3.2.3試驗樣品成型加工..................................................23
3.2.4耐磨性試驗........................................................24
3.2.5滑動磨損性試驗....................................................25
3.2.6拉伸試驗.........................................................25
3.2.7疲勞試驗.........................................................25
第四章 結果與討論.....................................................27
4.1微觀結構...........................................................27
4.2機械性能...........................................................29
4.2.1 鋁合金與複合材料之磨耗影響........................................29
4.2.2 鋁合金與複合材料之拉伸性能........................................32
4.2.3 鋁合金與複合材料之疲勞性能........................................33
第五章 結論..........................................................47
參考文獻..............................................................49
Extended Abstract....................................................54

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