鑄鍛與陽極處理對Al-1.2Mg-1.0Si-1.0Cu合金的機械性質與疲勞性質研究

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林家瑋(Jia-Wei Lin) 查詢紙本館藏

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鑄鍛與陽極處理對Al-1.2Mg-1.0Si-1.0Cu合金的機械性質與疲勞性質研究

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摘要(中)

本研究利用鑄/鍛生產Al-1.2Mg.1.0Si-1.0Cu合金。合金透過熔煉和澆注到Y型模具形成鑄件。經過均質化處理後，試塊會將冒口端切除，並在193K的溫度下放置600秒。將冷凍下來的鑄件，經過變形量50%的鍛造變形。鍛造完的試塊，經過T6熱處理後，將試塊熱加工成拉伸試棒，經過疲勞測試後得到抗拉強度420MPa，延伸率12%的拉伸性質。本研究會探討微結構與機械性質的關係。將有/無陽極的後的疲勞試棒，使用旋轉彎曲疲勞試驗機進行疲勞測試，測量在1 × 107圈數下的疲勞強度，並且建立疲勞曲線與比較有/無陽極處理的疲勞性質。在1 × 107壽命下，疲勞強度為117MPa，陽極過後的疲勞強度為110MPa。本實驗利用SEM觀察疲勞破斷面，紀錄破裂型態與計算裂紋起始的面積。結果，本實驗觀察反覆應力在120MPa下的疲勞破斷試棒，獲得裂紋起始的應力強度因子(△Kini)為1.97MPa√m。

摘要(英)

Cast/forging process was used to produce Al-1.2Mg-1.0Si- 1.0Cu alloy samples in this study. The alloy was melt and poured to get Y-block castings. After homogenization treatment, the block samples were cut to remove top risers and at 193 K (dry ice) for 600 s. The frozen casting blocks were forged by a set of open die to produce 50 % reduction in thickness. After T6 heat treatment the forged blocks were machined to get tensile specimens and then tested to obtain tensile properties of UTS of 420 MPa and an elongation of 12%. Relations of microstructure and mechanical properties were discussed in this study. Parts of specimen with/ without anodization were prepared for running high-cycle fatigue test up to 1 × 107 cycles. The stress (S)-cycle life (N) curves of samples with/without anodization were constructed and compared. The former sample displayed fatigue strength of 117 MPa and the latter samples yielded fatigue strength of 110MPa at 1 × 107 life cycles. SEM was used to observe fracture surface of samples. The fractured morphologies were recorded and used for computing crack initiation area. As a result, stress intensity factor for crack initiation (ΔKinit) was obtained as 1.97 MPa√m (1 × 106) at 120 MPa stress amplitude.

關鍵字(中)

★ 鑄/鍛
★ 疲勞
★ 應力強度因子△K

關鍵字(英)

論文目次

摘要 I
Abstract II
圖目錄 V
表目錄 IX
第一章前言 1
第二章文獻回顧 2
2-1 鑄/鍛鋁合金的簡介 2
2-2 鋁合金中 Mg，Si，Cu 等元素對析出行為的影響 5
2-2-1 Al-Mg-Si 合金簡介 5
2-2-2 Al-Mg-Si-Cu 簡介 8
2-2-3 Al-Mg-Si-Cu 鑄造合金均質化處理對微結構的影響 10
2-3 鋁合金的疲勞破壞 12
2-3-1 疲勞破壞的過程 12
2-3-2 疲勞裂紋的傳播 13
2-3-3 旋轉式疲勞介紹 15
2-3-4 疲勞行為時的晶界角度變化 16
2-3-5 高/低晶界角度對裂紋生長影響 20
2-3-6 疲勞裂紋成長速率與應力強度因子介紹 21
2-3-7 動態析出物對疲勞壽命的影響 28
2-4 鋁合金陽極處理 29
2-4-1 合金元素對鋁合金陽極氧化膜的影響 31
2-4-2 陽極處理對疲勞壽命的影響 31

第三章實驗步驟 34
3-1 實驗材料 34
3-2 實驗儀器 34
3-3 試棒尺寸與模具 36
3-4 實驗步驟 38
第四章結果與討論 44
4-1 Al-Mg-Si-Cu-Zr 合金的熱處理參數對微結構的影響 44
4-2 鑄/鍛 Al-Mg-Si-Cu-Zr 合金的機械性質 48
4-3 鑄/鍛 Al-Mg-Si-Cu-Zr 合金的巨觀組織 49
4-4 XRD 分析 52
4-5 鑄/鍛 Al-Mg-Si-Cu-Zr 合金的微觀組織 53
4-6 疲勞測試前/後基地巨觀組織變化 54
4-7 陽極皮膜對 Al-Si-Cu-Mg-Zr 合金的疲勞性質影響 56
4-8 鑄/鍛 Al-Mg-Si-Cu-Zr 合金疲勞破斷面分析 59
4-9 應力強度因子計算 68
4-10 應力強度因子分析 69
4-11 鑄/鍛 Al-Mg-Si-Cu-Zr 合金的腐蝕電位及電流分析 72
第五章綜論 77
第六章結論 81
參考文獻 82

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指導教授

施登士(Teng-Shih Shih)

審核日期

2017-8-22

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