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Student Number 90343006
Author Ching-Yi Yang(楊進義)
Author's Email Address s0343006@cc.ncu.edu.tw
Statistics This thesis had been viewed 2410 times. Download 1073 times.
Department Mechanical Engineering
Year 2005
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language zh-TW.Big5 Chinese
Title Effects of Be neutralizer and Sr / Sb modifiers on the microstructure and properties of A357 alloys
Date of Defense 2006-06-28
Page Count 112
Keyword
  • A357 alloy
  • Corrosion resistance
  • Iron-bearing phase
  • Mechanically mixed layer
  • Modifiers
  • Neutralizer
  • Silicon morphology
  • Abstract 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.
    Table of Content 目 錄
    中文摘要 I
    英文摘要 III
    謝誌 V
    目錄 VI
    圖目錄 X
    表目錄 XⅢ
    第一章 研究背景與文獻回顧 1
    1.1 A357鑄造鋁合金簡介 1
    1.1.1鋁合金簡介 1
    1.1.2 A357鋁合金性質簡介 3
    1.2研究背景與文獻回顧 7
    1.3研究動機與目的 15
    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
    2.1.2合金熱處理 20
    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合金準備與鑄造 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
    3.3.1光學顯微鏡 39
    3.3.2掃描式電子顯微鏡 40
    3.3.3穿透式電子顯微鏡 40
    3.3.4電子微探儀 40
    3.3.5影像分析 41
    3.3.6導電度量測 41
    3.3.7熱差掃瞄分析 42
    3.4機械性質試驗 43
    3.4.1 硬度試驗 43
    3.4.2 拉伸試驗 43
    3.5腐蝕性質試驗 43
    3.6磨耗試驗 44
    第四章 結果與討論 48
    4.1鈹與鐵含量對合金微結構、機械與腐蝕性質的影響 48
    4.1.1 微結構分析 48
    4.1.2 機械性質試驗 59
    4.1.3腐蝕試驗 65
    4.2改良劑對A357合金耐磨耗性質的影響 70
    4.2.1 微結構分析 70
    4.2.2磨耗試驗 75
    第五章 結論 97
    第六章 未來研究方向 100
    參考文獻 102
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    Advisor
  • Sheng-Long Lee(李勝隆)
  • Files
  • 90343006.pdf
  • approve immediately
    Date of Submission 2006-07-06

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