博碩士論文 91323039 詳細資訊




以作者查詢圖書館館藏 以作者查詢臺灣博碩士 以作者查詢全國書目 勘誤回報 、線上人數:12 、訪客IP:3.231.229.89
姓名 邱鼎為(Ding-Wei Chiu)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 均質化處理及時效處理條件對航空用鋁合金金屬疲勞舉動之影響
(Influence of homogenization temper and aged temper on the fatigue behavior of aerospace aluminum alloy)
相關論文
★ 鋁電解電容器用陽極鋁箔電蝕時電化學舉動之研究★ 汽車車體用鋁合金板材、擠型材之研究
★ 汽車車體骨架用6000系鋁合金低溫時效與擠型條件之研究★ 材料製程對汽車車體用鋁合金彎曲加工特性之影響研究
★ 鋁電解電容器用低壓陽極箔鋁箔之研發★ 鋁原箔對鋁電解電容器用高壓陽極鋁箔電解腐蝕舉動之影響研究
★ 電蝕條件對鋁電解電容器用高壓陽極鋁箔電蝕時電化學舉動之影響研究★ 鋁原箔製程參數對低壓鋁電解電容器用陽極鋁箔電解腐蝕舉動影響之研究
★ 微量元素對高壓鋁電解電容器用 陽極鋁箔電解腐蝕舉動影響之研究★ 微量元素對低壓鋁電解電容器用 陽極鋁箔電解腐蝕舉動影響之研究
★ 製程履歷對汽車車體用6022 鋁合金析出舉動之影響研究★ 製程條件對汽車車體用6022鋁合金析出擧動之影響
★ 鋁電解電容器用高純度鋁箔直流電蝕擧動之模型分析★ 腐蝕環境對航空用7050鋁合金金屬疲勞擧動之影響
★ 低壓鋁電解電容器用鋁箔之電蝕條件最佳化研究★ 比較硬質鋁箔與退火後鋁箔在電蝕時 電蝕結構及特性之研究
檔案 [Endnote RIS 格式]    [Bibtex 格式]    [相關文章]   [文章引用]   [完整記錄]   [館藏目錄]   至系統瀏覽論文 ( 永不開放)
摘要(中) 本研究主要以7075與7050航空用鋁合金為實驗材料,探討不同熱處理條件所呈現之疲勞裂縫成長特性。
  實驗中藉由改變均質化參數、固溶參數、時效處理參數以及R值,並配合光學顯微鏡(OM)、掃描式電子顯微鏡(SEM)、掃描穿透式電子顯微鏡(TEM)、動態材料試驗機作分析,研究影響疲勞裂縫成長特性之因數,搭配合金已知的拉伸性質與應力腐蝕效應,可作為航空材料選用之重要依據。
  由實驗結果得知,當R=0.1時,若合金採階段性均質化處理(Step-H),則在應力強度因數差值小時(△K<16MPa ),合金擁有較小之降伏強度、非整合型的析出物以及晶界周圍擁有較寬之無析出空乏帶(PFZ)時,可以得到較佳之裂縫成長特性,但必須考慮階段性淬火促進異質成核導致基地弱化的影響,在△K大時,影響裂縫成長的效應隨之減弱使裂縫成長曲線相仿。當施以H470均質化時,可以得到較大之再結晶晶粒與較高比例之再結晶,而在大晶粒的情況下不同時效處理之裂縫成長曲線幾乎重合,另外,較大之晶粒在裂縫成長時其破斷面較為粗糙,會引發裂縫閉合效應而減緩裂縫的延伸。當R=0.8時,不同熱處理對於裂縫成長特性的影響大幅減少,會得到幾乎一致的成長曲線。此外,7075合金由於形成之分散相E phase較7050合金之分散相Al3Zr粗大,當裂縫在成長時會有架橋效應的產生,阻礙裂縫的前進,因此7075呈現較7050合金為佳的裂縫成長特性。
摘要(英) A program of experimental and analytical tasks has been conducted to discuss the relationship between heat treatment and fatigue crack propa-
gation(FCP)in an aluminum aerospace alloy 7075 and 7050.
The experiment was investigated via different homogenization, solution, aging condition and load ratio. The influence of fatigue crack pro-
pagation was characterized and analyzed by using optical microscopy (OM), scanning electron mic-
roscopy (SEM), transmission electron microscopy (TEM) and Instron Model 8800 Testing System. The basis of airframe structural application is the result of experiment combining with tensile pr-
operties and stress corrosion cracking effect.
The result indicate that the alloys received step-homogenuzation(Step-H) have higher resistanc to fatigue crack growth with lower yielding st-
ress, incoherent precipitation and wider PFZ when a stress ratio (R) is 0.1 and △K is small. But it can get similar fatigue crack growth rates in all aged temper condition with increasing △K. When the alloys were given H470, it can obtain the highest fraction of recrystallization and
larger grain size. Alloys with larger grain size will get almost the same fatigue crack growth rates in all heat treatment and it also occur roughness-induced closure for the mis-match of fracture surface.The aluminum alloy 7075 will percipates coarse Al3Zr dispersoids and can bri-
ges the surface cracks resulting in retarding crack propagation, hence the alloy 7075 can get better resistance of crack propagation than the alloy 7050.
關鍵字(中) ★ 時效處理
★ 無析出空乏帶
★ 裂縫閉合效應
★ 架橋效應
★ 均質化處理
★ 7050鋁合金
★ 7075鋁合金
關鍵字(英) ★ Aluminum alloy 7075
★ Aluminum alloy 7050
★ Aged temper
★ Bridge
★ Crack closure
★ PFZ
★ Homogenization
★ Solution
論文目次 目 錄
頁次
Abstract……………………………………………Ⅰ
摘要…………………………………………………Ⅱ
目錄…………………………………………………Ⅲ
表目錄………………………………………………Ⅳ
圖目錄………………………………………………Ⅴ
第一章 緒論
一、序言 1
二、理論基礎與文獻回顧…………………………2
2.1 7000系鋁合金之時效析出序列………………2
2.2 淬火敏感性(Quench Sensitivity)…………4
2.3 再結晶與分散粒子……………………………6
2.3.1 再結晶的機構 ………………………………6
2.3.2 分散粒子對再結晶的影響…………………7
2.4 疲勞性質探討…………………………………10
2.4.1 疲勞機制……………………………………10
2.4.2 疲勞的影響機構……………………………11
2.5 裂縫閉合現象…………………………………12
2.6 氫致脆裂機構…………………………………12
第二章 本文………………………………………14
一、前言……………………………………………14
二、實驗步驟與方法 ………………………………16
2.1 材料……………………………………………16
2.2 製程……………………………………………16
2.3 拉伸試驗(Tensile Test)…………………17
2.4 疲勞裂縫成長試驗……………………………17
2.5 金相及疲勞裂縫路徑之觀察(OM)…………18
2.6 掃描式電子顯微鏡觀察(SEM)………………18
2.7 掃描穿透式電子顯微鏡(TEM)………………19
三、結果與討論……………………………………20
3.1 不同熱處理條件下之顯微結構………………20
3.1.1 均質化對於微結構的影響…………………20
3.1.2 固溶時效處理對於微結構的影響…………21
3.2 不同熱處理條件下之拉伸性質比較…………21
3.3 熱處理對於疲勞裂縫成長特性之影響………22
3.3.1 R=0.1時疲勞裂縫成長之特性………………22
3.3.2 R=0.8時疲勞裂縫成長之特性………………25
四、結論……………………………………………28
五、參考文獻………………………………………30
表……………………………………………………35
圖……………………………………………………37
參考文獻 【1】I. J. Polmear,“Light Alloys- Metallurgy of the Light Metals, 2nd ed. ”, Edward Arnold, London, England, 1989, pp. 18-143.
【2】R. C. Dorward and D. J. Beerntsen,“Grain Structure and Quench-Rate Effects on Strength and Toughness of AA7050 Al-Zn-Mg-Cu-Zr Alloy Plate,” Metall. Mater. Trans. A, 26A, 1995, pp.2481-2484.
【3】A.K. Vasudevan and R. D. Doherty,“Aluminum Alloys - Contemporary Research and Applications,” Academic Press, Inc., San Diego, 1989, pp.35-170
【4】M. Conserva and P. Fiorini, “Interpretation of Quench-Sensitivity in Al- Zn-Mg-Cu Alloys, ” Metall. Trans., vol. 4, 1973, pp.857-862.
【5】J. A. Wagner and R. N. Shenoy , “The Effect of Copper, Chromium, and Zirconium on the Microstructure and Mechanical Properties of Al-Zn- Mg-Cu Alloys,” Metall. Trans. A, vol. 22A, 1991, pp. 2809-2818.
【6】J. Bryant, A. T. Thomas , “The Relationship between Grain Structure and Quench-Sensitivity of an Extruded Al-Zn-Mg Alloy,” J. Inst. Metals, vol. 100, 1972, p.40-44.
【7】M. Kanno, Bin-lung Ou and Goroh Itoh, “Quench sensitivity of some age-hardenable aluminium alloys,” Proceedings of the 2nd international conference of aluminium alloys, 1990, pp.1-6.
【8】H. Suzuki, M. Kanno and H. Saitoh, “Effects of Zirconium Addition on the Quench-Sensitivity of AlZnMgCu Alloys, ”Aluminum, vol. 59, 1983, pp. 944-947.
【9】H. Suzuki, M. Kanno and H. Saitoh, “Influence of Working on Quench Sensitivity of Al-Zn-Mg-Cu Alloy containing Transition Elements, ”J. Japan Inst. Light Met., vol. 33, 1983, pp. 399-406.
【10】H. Suzuki, M. Kanno, and H. Saitoh, “Different Effects Between Zr and Cr Additions on Recrystallization of Hot-Rolled Al-Zn-Mg-Cu Alloys,” J. Japan Inst. Light Metals, vol. 36, No. 1, 1986, pp. 22-28.
【11】A.J. Cornish and M.K.B. Day,“The Effect of Variable Quenching Conditions on the Relationship between the Stress-Corrosion-Resistance, Tensile Properties, and Microstructure of a High-Purity Al-Zn-Mg Alloy,” J. Inst. Metals, vol. 99, 1971, pp.377-384.
【12】S. Chang and J. E. Morral, “The Influence of Quenching Rate on Precipitate-Free-Zones in an Al-Zn-Mg Alloy, ” ACTA Metal., vol. 23, 1975, pp.685-689.
【13】D. A. Porter and K.E. Easterling, “Phase Transformations in Metals and Alloys, ” London, Chapman & Hall, 1993, pp. 263-308.
【14】D. Williamand and Jr. Callister, “Materials Science and Engineering , 3rd ed. , ” New York , John Wiley & Sons , Inc , 1994 , pp.92-162.
【15】R. D. Doherty, “Role of interfaces in kinetics of internal shape changes, ”Metal Science, vol. 16, 1982, pp.1-13.
【16】D.A. Porter and K.E. Easterling, “Phase Transformations in Metals and Alloys, ” London, Chapman & Hall, 1993, pp. 44-47, 71-75 and 314-317.
【17】G. Itoh, H. Saitoh, Bin-Lung Ou, H. Suzuki, “Effect of Homogenization Conditions on Recrystallized Structure in Al-Zn-Mg-Cu Alloys Containing Chrimium, ” J. of Japan Inst. of Light Metals, vol. 36, No, 8, 1986, pp. 485-490.
【18】劉國雄,林樹均,李勝隆,鄭晃忠,葉均蔚, “工程材料科學,修訂版,”全華科技圖書,1999,pp. 864.
【19】D. Nguyen, A. W. Thompson and I. M. Bernstein, “ icrostructural Effects on Hydrogen Embrittlement in High Purity 7075 Aluminum Alloy, ” Acta Metall., vol. 35, 1987, pp. 2417-2425.
【20】C. Menzemer, T.S. Srivatsan, “The effect of environment on fatigue crack growth behavior of aluminum alloy 5456,” Materials Science and Engineering,A271,1999, pp.188-195.
【21】劉永輝、張佩芬: 金屬腐蝕學原理,航空工業出版社, 1993, pp. 124-150.
【22】J. Albrecht, I. M. Bernstein and A. W. Thompson,“Evidence for Dislocation Transport of Hydrogen in Aluminum, ” Metall. Trans., 13A, 1982, pp. 811-820.
【23】D.A. Hardwick, M. Taberi, A.W. Thompson and I.M. Bernstein, “ Hydrogen Embrittlement in a 2000-Series Aluminum Alloy, ” Met. Trans., vol. 13A, No. 2, 1982, pp. 235-239.
【24】A.R. Troiano, “ Transactions ASM, ” 1960, vol. 52, pp. 54.
【25】B.F. Brown, “Stress Corrosion Cracking of High Strength Steels, The Theory of Stress Corrosion Cracking in Alloys, ed. by Dr. J. C. Scully, ” NATO, Brusels, 1971, pp. 186-204.
【26】楊智綱,“高強度航空用7000系鋁合金機械性質、抗應力腐蝕破壞性及銲接熱影響區特性之研究,”國立中央大學機械工程研究所博士論文,2001.
【27】M. O. Speidel,“Stress Corrosion Cracking of aluminum alloys, ” Metall. Trans. A, vol. 6A, 1975, pp. 631-642.
【28】D. J. Lloyd and M. C. Chaturvedi,“A calorimetric study of aluminum alloy AA-7075, ” J. of Mater. Sci., vol. 17, 1982, pp. 1819-1824.
【29】P.N. Adler and Richard DeIASI, “Calorimetric Studies of 7000 Series Aluminum Alloys: II. Comparison of 7075, 7050, and RX720 Alloys, ” Metall. Trans. A,. vol. 8A ,1977, pp. 1185-1190.
【30】Richard DeIASI and P.N. Adler, “Calorimetric Studies of 7000 Series Aluminum Alloys: I. Matrix Precipitate Characterization of 7075,”Metall. Trans. A, vol. 8A, 1977, pp. 1177-1183.
【31】M. Conserva, E. Di Russo and O. Caloni, “Comparison of the Influence of Chrominum and Zirconium on the Quench Sensitivity of Al-Zn-Mg- Cu Alloys,”Metall. Trans., vol. 2, 1971, pp. 1227-1232.
【32】J.D. Frandsen and H.L. Marcus,Scripta Met.9,1975,1089
【33】J.K.Tien, “Effect of Hydrogen on Behavior of Materials, ”A.W. Thompson and I.M. Bernstein,eds.,The Metallurgical Society of AIME , p301.
【34】S.Suresh,R.O.Ritchic,Int.Met.Rev.29,1984,455.
指導教授 歐炳隆(Bin-Lung Ou) 審核日期 2004-7-14
推文 facebook   plurk   twitter   funp   google   live   udn   HD   myshare   reddit   netvibes   friend   youpush   delicious   baidu   
網路書籤 Google bookmarks   del.icio.us   hemidemi   myshare   

若有論文相關問題,請聯絡國立中央大學圖書館推廣服務組 TEL:(03)422-7151轉57407,或E-mail聯絡  - 隱私權政策聲明