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博碩士論文 etd-0806109-214927 詳細資訊
Title page for etd-0806109-214927
論文名稱
Title
超細晶AA3003鋁合金之拉伸變形行為研究
A study of the tensile deformation of ultrafine grained AA3003 aluminum alloy
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
145
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2009-07-13
繳交日期
Date of Submission
2009-08-06
關鍵字
Keywords
機械性質、等徑轉角擠型、鋁合金
AA3003, ECAE
統計
Statistics
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中文摘要
實驗利用不同的製程參數,改變超細晶AA3003鋁錳合金的微結構,以及合金元素的固溶/析出量,並討論其影響。實驗利用ECAE施以大量的應變量,使AA3003鋁合金的晶粒細化。
隨著ECAE的應變量增加,晶粒逐漸的被細化成更小的次晶粒,AA3003的拉伸強度以及加工硬化率也都有明顯的提升。在ECAE擠製前,降低均質化溫度,則使材料有較多的二次相顆粒殘留,並且提升擠製後的拉伸強度,以及加工硬化率。而擠製後的材料,隨著後續退火溫度及時間的提升,微結構逐漸改變,且次晶粒逐漸長大,使得材料的強度也隨之下降,並且產生四種不同的拉伸變形行為。此外,在超細晶AA3003的退火行為中,有退火硬化的現象發生,其硬化程度又以高溫均質化的材料較為明顯。 超細晶AA3003鋁合金的應變速率敏感值(m),受到ECAE的加工應變量不同,以及均質化溫度所影響。當ECAE加工應變量增加時,m也隨之提升,但m值仍小於低溫均質化處理後的材料。
Abstract
none
目次 Table of Contents
表目錄 ....................................................................................................... iv
圖目錄 ......................................................................................................... v
一、前言 ..................................................................................................... 1
二、文獻回顧 ............................................................................................ 2
2-1 AA3003鋁合金............................................................................ 2
2-1-1 AA 3003鋁合金的析出物 ............................................... 3
2-2 等徑轉角擠型(equal channel angular extrusion, ECAE) ...... 5
2-2-1 等徑轉角擠型之原理 ...................................................... 5
2-2-2 ECAE的應變量............................................................... 6
2-3 超細晶金屬之機械性質 ............................................................. 7
2-3-1 超細晶金屬的強度 .......................................................... 8
2-3-2 超細晶的降伏下降(yield drop)現象 ............................. 9
2-3-3 超細晶金屬的延展性 .................................................... 10
2-3-4 超性晶材料的應變速率敏感度 ................................... 13
2-3-5 超細晶金屬的晶界特性 ................................................ 15
2-4 添加固溶合金元素的影響 ....................................................... 17
三、研究目的 .......................................................................................... 19
四、實驗方法 .......................................................................................... 20
4-1 實驗材料 ................................................................................... 21
4-2 均質化處理 (homogenization) ............................................... 21
4-3 等徑轉角擠型 (ECAE) ........................................................... 22
4-4 退火處理 (annealing) .............................................................. 22
4-5 微硬度測詴 (microhardness test) .......................................... 23
4-6 拉伸測詴 (tensile test) ............................................................ 24
4-7 微結構分析 (microstructure analysis) .................................. 25
五、實驗結果 .......................................................................................... 26
5-1 ECAE擠製後的微結構 ............................................................ 27
5-2 ECAE擠製AA3003 鋁合金的退火行為 ............................... 29
5-2-1 退火軟化曲線 ................................................................ 29
5-2-2 退火溫度造成的微結構變化 ....................................... 30
5-2-3 退火時間造成的微結構變化 ....................................... 31
5-3 超細晶AA3003鋁合金的拉伸變形行為 ............................... 32
5-3-1 ECAE擠製後的拉伸機械性質 .................................... 32
5-3-2 退火處理後的拉伸機械性質 ....................................... 34
5-3-3 低應變速率下的拉伸變形行為 ................................... 37
5-3-4 應變速率改變(strain rate jump)測詴 ......................... 38
5-3-5 拉伸後的表面變形與微結構 ....................................... 39
5-4 實驗結果總論 ........................................................................... 41
六、討論 ................................................................................................... 43
6-1 晶粒尺寸與降伏強度之關係 ................................................... 43
6-2 超細晶的降伏下降現象 ........................................................... 45
6-3 ECAE應變量對於超細晶AA3003的拉伸強度影響 ............ 47
6-4 均質化處理溫度對於超細晶AA3003的拉伸強度影響 ....... 48
6-5 超細晶AA3003的退火硬化現象 ........................................... 49
6-6 超細晶AA3003的應變速率敏感度 ....................................... 51
七、結論 ................................................................................................... 55
參考文獻 ................................................................................................... 57
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