姓名 楊進義(Ching-Yi Yang) 查詢紙本館藏 畢業系所 機械工程學系 論文名稱 鈹中和劑與鍶、銻改良劑對A357鋁合金微結構及性質之影響
(Effects of Be neutralizer and Sr / Sb modifiers on the microstructure and properties of A357 alloys)
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摘要(英) A357 aluminum alloy(Al-7Si-0.7Mg) is extensively used in the aerospace and automotive industries, due to its excellent properties that include castability, weldability, hot-cracking resistance and specific strength. Iron is the most deleterious impurity in the Al-Si-Mg cast alloy. Fe combines with Al, Si, and Mg to form various intermetallic compounds during solidification. The intermetallic phase is considered to have the worst effect, as it significantly decreases the ductility of material. Adding neutralizer to an alloy can change the shape of iron-bearing phase to the harmless shape. This work investigated how Be and Fe affect the morphologies of iron-bearing phase in addition to the mechanical and corrosion behaviors of A357 alloys. Furthermore, silicon is added to aluminum alloy as a second phase. The wear properties of aluminum alloys are significantly affected by the silicon morphology. The addition of modifier to A357 alloy can alter the morphology of the silicon particles. Therefore, this study examines the sliding wear characteristics of an unmodified A357 alloy and the alloy modified with Sr / Sb in the T6 heat-treated condition.
Microstructural features were elucidated by optical microscopy, scanning electron microscopy, electron probe X-ray microanalysis, image analysis, measurement of electrical conductivity and differential scanning calorimetry. The microstructure was correlated with tensile, corrosion and wear testing.
The results of present works revealed that many platelet-like (β-FeSiAl5) and Chinese-script (π-FeMg3Si6Al8) iron-bearing phases were found in A357 alloys. These structures are replaced by a nodular shape Mg-free structure of iron-bearing constituents when Be is added. Adding Be to the alloy can increase the level of solid Mg solution, change the morphology of silicon particles to a small and globular shape, subsequently reducing the amount of iron-bearing phases. Be can also enhance the precipitation kinetics and increase the quantity of Mg2Si precipitates to improve the tensile properties of A357 alloys. The corrosion behavior of A357 alloy was affected by the morphology of the silicon particles and the amount of iron-bearing phases. The corrosion resistance improved when the amount of iron-bearing phases was reduced and the silicon particles were spheroidized and refined. Analysis of the A357 alloys containing different quantities of Fe indicates that the amount of iron-bearing phases increases with increasing Fe content, decreasing the alloy’s corrosion resistance and worsening its mechanical properties.
The wear behavior of A357 alloys was influenced by the morphology of silicon particles and the stability of the mechanically mixed layer (MML). Sliding wear tests revealed that the addition of both Sr and Sb modifiers improves the wear resistance of the alloy. This beneficial effect of enhanced wear resistance was more apparent in the Sr-modified alloy than the Sb-modified one. This was attributed to the lower cracking tendency of the Sr-modified alloy owing to the near-spherical nature of silicon particles. Furthermore, the silicon particles in the Sr-modified alloy were finer and more spherical than those in the Sb-modified and unmodified alloys. Additionally, the decreased wear rate was also substantiated through the formation of a stable MML on the worn surface. Observations of worn surfaces showed more stable MML on the worn surface of Sr-modified alloy than for the unmodified and Sb-modified alloys.
關鍵字(中) ★ 中和劑
關鍵字(英) ★ A357 alloy
★ Iron-bearing phase
★ Corrosion resistance
★ Silicon morphology
★ Mechanically mixed layer
論文目次 目 錄
第一章 研究背景與文獻回顧 1
1.1 A357鑄造鋁合金簡介 1
1.1.2 A357鋁合金性質簡介 3
第二章 基礎理論 18
2.1 A357鋁合金基礎理論 18
2.1.1 合金凝固特性 18
2.2 A357鋁合金的腐蝕 25
2.3電化學之Tafel 極化法腐蝕量測 27
2.4 磨耗 30
第三章 實驗方法 36
3.1.1 不同鈹與鐵含量合金之製作(合金A、B、C與D) 36
3.1.2不同改良劑種類合金之製作(合金E、F與G ) 39
3.2 熱處理 39
3.3 微結構觀察與分析 39
3.4.1 硬度試驗 43
3.4.2 拉伸試驗 43
第四章 結果與討論 48
4.1.1 微結構分析 48
4.1.2 機械性質試驗 59
4.2.1 微結構分析 70
第五章 結論 97
第六章 未來研究方向 100
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指導教授 李勝隆(Sheng-Long Lee) 審核日期 2006-7-6 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu