Sc與Cu含量對A201合金銲接特性之研究

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董孟軒(Meng-Syuan Doong) 查詢紙本館藏

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機械工程學系

論文名稱

Sc與Cu含量對A201合金銲接特性之研究

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摘要(中)

由於A201合金具有較寬之固液兩相區（123～127℃），容易於鑄件中產生缺陷，故銲接性質差，極易發生銲接熱裂等問題。在Al-Cu合金中添加微量Sc、Zr後，將使晶粒大幅細化而降低銲接熱裂發生，提升合金銲接性；但W（Al5.4-8Cu6.6-4Sc）相之生成，將降低析出強化效果，造成合金強度不足的問題。
本實驗擬於Al-4.6Cu-0.3Mg-0.6Ag合金中添加0.4Sc及0.1Zr，並分別提高Cu（或卅與Mg、Ag）含量而配置成三種銲料合金，爾後分別對母材A201合金施以TIG銲接，並施以T7時效熱處理，探討Sc與Cu含量對A201合金銲接前後之微結構與機械性質之影響。利用光學顯微鏡(OM)、電子微探儀(EPMA)、導電度計(%IACS)、微差掃描熱分析儀(DSC)、穿透式電子顯微鏡(TEM)、掃描式電子顯微鏡(SEM)、硬度試驗、拉伸試驗(Tensile Test)等方法，探討各銲料合金與TIG銲後試片之微結構與機械性質之關係，並與母材A201合金做一比較。
結果顯示，含微量Sc、Zr之Al-Cu-Mg-Ag合金，於凝固時會晶出Al3(Sc,Zr)相及W相，使晶粒大幅細化；而W相之生成會消耗Cu元素，且無法藉由固溶處理回溶至基地內，減少Cu原子固溶量，導致降低合金強度及延性。提高Cu含量後，可提升材料強度，且不改變合金中良好的細晶組織；提高Mg含量，亦可提升材料強度，但大幅降低延性。此外，以含Sc、Zr之Al-Cu-Mg-Ag合金銲料於母材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；銲件之時效強度皆能維持在A201合金母材之80％以上，延性也可維持在母材A201合金之60％以上。

關鍵字(中)

★ A201合金
★ 銲接熱裂
★ W相
★ TIG銲

關鍵字(英)

★ Sc
★ hot cracking in weld
★ Zr
★ W phase
★ A201 alloy
★ TIG weld

論文目次

摘要………………………………………………………………Ⅰ
謝誌………………………………………………………………Ⅱ
總目錄……………………………………………………………Ⅲ
圖目錄……………………………………………………………Ⅴ
表目錄……………………………………………………………Ⅶ
壹、前言…………………………………………………………1
貳、實驗步驟與方法……………………………………………12
參、結果與討論…………………………………………………18
肆、結論…………………………………………………………55
伍、未來研究方向………………………………………………56
陸、參考資料……………………………………………………57

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2005-7-14

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