含Sc、Cu之A201合金銲條的銲補性
及常溫、高溫機械性質研究

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林進貴(C-K Lin) 查詢紙本館藏

畢業系所

機械工程學系在職專班

論文名稱

含Sc、Cu之A201合金銲條的銲補性及常溫、高溫機械性質研究

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摘要(中)

本研究主要目的在探討含Sc、Cu之A201合金焊條的焊補性及常溫、高溫機械性質之研究。
結果顯示Al-Cu-Mg-Ag-Sc-Zr合金，於凝固時便晶出Al3(Sc,Zr)相，使晶粒細化。而W(Al5.4-8Cu6.6-4Sc)相的形成消耗了部分Cu元素，且無法經由固溶處理回溶於基地內，使得Cu原子固溶量減少，導致θ’及Ω相析出量減少而降低合金強度及硬度。提高Cu含量後，可增加鋁基地中Cu原子固溶量，提升材料強度。
此外，以含Sc、Cu之A201銲料合金，於母材A201合金上實施TIG銲接後之銲件，其銲道組織皆為等軸細小晶粒，且無熱裂發生；銲件經T7後之常溫(25℃)抗拉強度為母材A201合金之91％，延性和母材A201合金相近；銲件經T7後之高溫(150℃、230℃) 抗拉強度分別為母材A201合金之90％及95％，延性和母材A201合金相近。

摘要(英)

The study for the purpose of fusion welding and Mechanical Properties of room temperature and high temperature of A201 alloy casting with A201 alloy containing Sc and Cu as filler metal .
Addition of Sc and Zr to Al-Cu-Mg-Ag alloys produces grain refinement due to the formation of primary Al3(Sc,Zr) intermetallic phase during solidification. The formation of
W(Al5.4-8Cu6.6-4Sc) phase consumes the parts of Cu content, and can’t dissolve in subsequent solution treatment. As a result, the available amount of Cu which is dissolved in matrix reduces, diminishing the precipitates of Ω and θ’ phase, and the hardness and strength decrease. After increasing Cu content, the available amount of Cu in Al-matrix will be raised, and the strength of material will be promoted.
Further A201 alloy containing Sc and Cu as filler metal，the base metal is A201 alloy，in TIG (tungsten inert gas) welds.After welding，the grain of fusion zone fine equiaxed dendritic structure and has no hot cracking .The ultimate strength at room temperature of welding bar that has been T7 is 91％ of A201 alloy.The elongation at room temperature of welding bar that has been T7 is similar to A201 alloy. The ultimate strength at high temperature(150℃、230℃) of welding bar that has been T7 is 90％ and 95％ of A201 alloy separately.The elongation at high temperature(150℃、230℃) of welding bar that has been T7 is approaching A201 alloy.

關鍵字(中)

關鍵字(英)

★ hot cracking
★ TIG
★ A201

論文目次

總目錄
摘要......................................................Ⅰ
謝誌......................................................Ⅲ
總目錄....................................................Ⅴ
圖目錄....................................................Ⅶ
表目錄....................................................Ⅷ
壹、前言....................................................1
1.1 高強度鑄造用鋁合金近二十年在國防工業之應用.........1
1.2 A201高強度鋁合金之文獻回顧.........................2
1.3 A201鑄造用鋁合金之銲接性...........................5
1.4 微量過渡元素（Sc、Zr等）對銲接及其他特性之效用.....7
1.5 實驗目的與焊料合金設計............................11
貳、實驗步驟與方法.........................................13
2.1 製程部分：合金熔配、銲接及熱處理....................14
2.1-1 合金熔配與成分分析..................................14
2.1-2 銲接製程............................................14
2.1-3 熱處理..............................................17
2.1-4 微結構分析..........................................17
2.1-4-1 金相OM觀察.........................................17
2.1-5 導電度(％IACS)量測..................................17
2.1-6 電子微探儀(EPMA)....................................17
2.1-7 微差掃描熱分析儀(DSC).............................18
2.1-8 穿透式電子顯微鏡(TEM).............................18
2.1-9 掃描式電子顯微鏡(SEM).............................18
2.1-10 機械性質分析......................................18
2.1-10-1 硬度試驗..........................................18
2.1-10-2 拉伸試驗..........................................18
參、結果與討論.............................................20
3.1-1 微結構分析........................................20
3.1-1-1 金相觀察..........................................20
3.1-2 導電度(％IACS)分析................................25
3.1-3 微差掃瞄熱分析(DSC)...............................26
3.1-4 機械性質分析......................................28
3.1-4-1 硬度試驗..........................................28
3.1-4-2 拉伸試驗..........................................29
3.2 經TIG(Tungsten inert gas ) 銲接後之性質分析.......31
3.2-1 微結構分析........................................31
3.2-1-1 金相觀察..........................................31
3.2-2 常溫機械性質分析..................................36
3.2-2-1 硬度試驗..........................................36
3.2-2-2 拉伸試驗..........................................38
3.2-3 高溫(150℃、230℃) 機械性質.......................40
肆、結論...................................................43
伍、參考資料...............................................45

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指導教授

李勝隆(Sheng-long Lee)

審核日期

2006-7-11

推文