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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Title:	含Sc、Cu之A201合金銲條的銲補性及常溫、高溫機械性質研究
Authors:	林進貴;C-K Lin
Contributors:	機械工程研究所碩士在職專班
Keywords:	hot cracking;TIG;A201
Date:	2006-06-29
Issue Date:	2009-09-21 11:52:54 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	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。 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.
Appears in Collections:	[Executive Master of Mechanical Engineering] Electronic Thesis & Dissertation

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