| 研究生: |
王景弘 Jing-Hong Wang |
|---|---|
| 論文名稱: |
Cu/Mg比與加工對Al-4.6Cu-Mg-Ag合金性質之影響 Effect of Cu/Mg Ratio and Processing on Properties of Al-4.6Cu-Mg-Ag Alloys |
| 指導教授: |
李勝隆
Sheng-Long Lee |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 64 |
| 中文關鍵詞: | Cu/Mg比 、Mg-Ag聚集 、加工硬化 、熱輥 、冷輥 |
| 外文關鍵詞: | Cu/Mg ratio, Mg-Ag co-clusters, work hardening, cold rolling, hot rolling |
| 相關次數: | 點閱:11 下載:0 |
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Al-Cu-Mg-Ag合金為一高強度鋁合金,強化相以Ω及θ’相為主,由文獻中知,當Cu/Mg比在5~10之間,析出強化相以Ω相為主;而當Cu/Mg比更高(>10)時,析出強化相以Ω相和θ’相為主,且當Ag含量高達0.6wt%時,可促進Ω相析出於鋁基地的主要滑動面{111}α上,因此可提升材料機械強度;而由於θ’相易在差排上異質成核,因此加工會促進θ’相的析出,故本研究探討主題為Cu/Mg比與加工對Al-4.6Cu-Mg-Ag合金性質之影響。
本研究針對Al-4.6Cu-Mg-Ag(wt%)合金,設計不同Cu/Mg比(Mg含量)之二種合金,分別為A合金(Cu/Mg=20)及B合金(Cu/Mg=8.5),施以冷加工(冷輥)及熱加工(熱輥),之後於185℃下行5小時之人工時效。利用光學顯微鏡(OM)、掃描式電子顯微鏡(SEM)、穿透式電子顯微鏡(TEM)、導電度(%IACS)、微差掃描熱分析(DSC)、密度、硬度試驗、拉伸試驗等方法,探討微結構變化與材料機械性質之關係。根據實驗結果,以了解不同Cu/Mg比與加工對Al-4.6Cu-Mg -Ag合金性質之影響。
由結果可知,增加Mg含量(Cu/Mg比下降)可促使合金在自然時效期間,Mg-Ag原子更快速形成聚集,經185℃人工時效後,更可促進Ω相和θ’相快速析出,且Mg的添加使加工硬化及固溶強化更明顯,提升機械強度,但降低延性。
熱輥因輥壓作用,造成晶粒細化,並因壓縮而減少微縮孔且縮小微縮孔直徑,增加密度,導致機械性質提升;冷輥易產生缺陷(差排、空位等),阻礙Mg-Ag原子於室溫下的聚集,經185℃×5hr之人工時效後,減少Ω相的析出,但增加θ’相的異質成核析出,由於加工硬化現象明顯,使硬度、拉伸強度皆提升,卻不利延性。
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