臺灣博碩士論文加值系統

本研究旨在探討熱機處理及時效處理，對7075 鋁合金含SiC 金
屬基複合材料之機械性質及顯微結構的影響。熱機處理為低溫軋延，
可使晶粒細化提升材料強度及硬度，再加上時效處理後因析出硬化亦
能提高機械性質。本實驗經均質化退火後，低溫軋延量分別為0%（未
軋延）、15%、30%及45%，再進行120℃一階段人工時效，探討不同
軋延量及時效對硬度及強度之影響。軋延量45%時效120℃6 小時具
有最佳的硬度及強度，其值分別為207 及660MPa。

The effects of thermomechanical treatment and aging on the
mechanical properties and microstructures of a 7075 aluminum alloys metal matrix composites reinforced with SiC have been investigated. Low temperature rolling refines the grain size so as to strengthen the experimental alloys. Aging treatment can also cause precipitation to increase the mechanical properties. In this study, followed with
homogenization, rolling was proceeded with different amounts of 0%,15%, 30 % and 45% at low temperature. Then followed with artificial aging at 125 . We discussed the effects of the ℃ amounts of rolling, and compare the variation of the hardening and strength before and after
aging. It is proposed that the optimal thermomechanical treatment parameter was rolling with the amount the 45% and aging for 6h.

中文摘要.................................................. i
英文摘要................................................. ii
目錄.................................................... iii
表目錄................................................... vi
圖目錄.................................................. vii
第一章前言................................................ 1
第二章文獻回顧............................................ 3
2-1 鋁合金特性......................................... 3
2-2 鋁合金的分類....................................... 3
2-3 7075 鋁合金及其熱處理.............................. 4
2-3.1 7075 鋁合金簡介.............................. 4
2-3.2 熱處理方式................................... 5
2-4 7075 鋁合金之機械性質.............................. 7
2-5 7075 鋁合金時效與析出強化.......................... 8
2-5.1 時效與析出強化之條件......................... 8
2-5.2 時效與析出強化之機構......................... 9
第三章實驗方法........................................... 17
3-1 實驗材料.......................................... 17
3-2 軋延(Rolling)..................................... 17
3-3 時效(Aging)....................................... 18
3-4 維氏硬度 (Vicker’sHardness) ..................... 18
3-5 拉伸試驗(Tensile Test)............................ 19
3-6 顯微觀察.......................................... 20
3-6.1 光學顯微鏡.................................. 20
3-6.2 掃描式電子顯微鏡............................ 20
第四章結果與討論......................................... 27
4-1 材料介紹.......................................... 27
4-2 熱機處理.......................................... 27
4-2.1 熱機處理對機械性質的影響.................... 27
4-2.2 熱機處理對顯微結構的影響.................... 29
4-2 析出強化.......................................... 31
4-2.1 析出強化與硬度.............................. 31
4-2.2 時效之顯微結構.............................. 32
4-3 拉伸試驗.......................................... 33
4-3.1 硬度與拉伸分析.............................. 33
4-3.1 顯微結構觀察................................ 35
第五章結論............................................... 54
第六章未來研究工作....................................... 55
參考文獻................................................. 56

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