高含量Ti、B對A201-T7鋁合金熱裂性、微結構與機械性質的影響

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陳勉中(Mian-Chung Chen) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

高含量Ti、B對A201-T7鋁合金熱裂性、微結構與機械性質的影響
(Effect of high Ti and B content on the hot tearing, microstructure and mechanical properties of A201-T7 aluminum alloys)

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摘要(中)

摘要

本研究藉由熱裂測試、光學顯微鏡(OM)、電子微探儀(EPMA)、導電度(%IACS)、機械性質(硬度、拉伸)試驗等，探討高含量Ti(3.0wt%)、B(1.4wt%)對高強度鑄造A201 (Al-4.5Cu-0.7Ag-0.3Mg) 合金之鑄造熱裂性、微結構、與機械性質之影響。
結果顯示，由於高含量Ti(3.0wt%)、B(1.4wt%)的添加，細化了鑄態合金晶粒，平均尺寸由105μm下降至45μm，且於鋁基地中生成TiB2、Al3Ti等中間相。當進行過時效處理(T7)後，合金強度與硬度約為418MPa與83HRB，相較於未改質合金，分別提升了7.1%與15%。顯示中間相雖具有散佈強化合金之效果，但對於添加高Ti、B的熱處理型A201合金而言，其提升強度與硬度仍屬有限。
藉由熱裂模具分析鑄造性後，發現合金抗熱裂性顯著提升，試棒完好數量由零根增加至三根，裂縫形貌由完全斷裂轉為細小裂縫。另外，相較於單獨添加，若同時添加Ti、B於合金中，由於極低膨脹係數的TiB2中間相生成之緣故，使合金具有最佳的鑄造性。

關鍵字: 鋁銅合金、鋁鈦硼中間相、低熱膨脹係數、抗熱裂性

摘要(英)

Abstract

This research presents the effect of high Ti (3.0wt%) and B (1.4wt%) content on the hot tearing, microstructure and mechanical properties of high strength A201(Al-Cu-Ag-Mg) aluminum alloys, the analyzed methods including hot tearing test, optical microscope (OM), electron probe micro analyzer (EPMA), electrical conductivity meter (% IACS), tensile test...ellipses.
The results showed the average grain size of as-cast state alloys decreased from 105μm to 45μm due to high Ti (3.0wt%) and B (1.4wt%) added. Besides, the intermetallic compounds such as TiB2, Al3Ti formed in the Al-Matrix. Compared to unmodified alloys, the tensile strength and hardness of high Ti and B content alloys increased about 7.1% and 15% after T7 heat treatment, up to 418MPa and 83HRB. Showed the improvements of mechanical properties on high Ti and B content heat-treatable A201 alloys was slight, although the intermetallic compounds had dispersion strengthening effect.
Castability was analyzed by hot tearing molds and the results showed the resistance of hot tearing improved significantly. The amount of unbroken test bar of modified alloys is three while the un-modified alloys is zero. The hot cracks morphology also indicated the resistance of hot tear improved with the addition of high Ti and B. Besides, compared to add Ti or B lonely, the alloys has the best castability while Ti and B were added together. That’s because the formation of the intermetallic compounds TiB2 which has low thermal expansion coefficient can improve the hot tearing resistance.

Keywords: Al-Cu alloy, intermetallic compounds, low thermal expansion coefficient, hot tearing resistance

關鍵字(中)

★ 鋁銅合金
★ 鋁鈦硼中間相
★ 低熱膨脹係數
★ 抗熱裂性

關鍵字(英)

★ Al-Cu alloy
★ intermetallic compounds
★ low thermal expansion coefficient
★ hot tearing resistance

論文目次

總目錄

中文摘要.......................................Ⅰ
英文摘要.......................................Ⅱ
誌謝..........................................Ⅲ
總目錄........................................Ⅳ
圖目錄........................................Ⅵ
表目錄........................................Ⅶ

一.前言與文獻回顧................................1
1.1 A201鋁合金簡介…..........................1
1.1.1 鋁合金簡介.........................1
1.1.2 A201鋁銅合金發展與性質..............2
1.1.3 A201鋁合金之應用與..................4
1.1.4 A201鋁合金的熱處理..................4
1.2 鑄造熱裂簡介..............................6
1.2.1 熱裂簡介............................6
1.2.2 影響熱裂的因素.......................6
1.3 Al-Ti-B 系統與金屬化合物...................9
1.3.1 Al3Ti中間相........................10
1.3.2 AlB2 與TiB2 中間相..................11
1.4 中間相於熔融鋁中的製備.................... 13
1.4.1 In-situ與Ex-Situ添加法.................13
1.4.2母合金添加法............................13
1.4.3中間相的生成效率........................15
1.5 研究背景與目的...........................16
二.實驗方法與步驟...............................17
2.1合金設計與熔配..............................18
2.2 Al-Ti-B中間相生成量分析............19
2.3固溶(均質化)、時效熱處理.................21
2.4 X光繞射分析................................21
2.5微結構觀察與分析.....................21
2.5.1 光學顯微鏡............................21
2.5.2 電子微探儀......................22
2.5.3 導電度量測.............22
2.6機械性質分析......................23
2.6.1 硬度試驗.................23
2.6.2 拉伸試驗...............23
2.7 熱裂模具分析....................23
三.結果與討論...............................25
3.1 Al-Ti-B中間相含量與種類......25
3.2微結構觀察與分析.............28
3.2.1 光學顯微鏡觀察........28
3.2.2 電子微探分析.........31
3.2.3 導電度量測.............35
3.3 機械性質分析....................37
3.3.1 硬度分析..................37
3.3.2 拉伸試驗.................39
3.4 熱裂分析............................40
四.結論.......................................43
五.未來研究方向................................44
六.參考資料....................................45

參考文獻

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指導教授

李勝隆(Shen-Long Lee)

審核日期

2019-7-11

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