• 作者： 楊智富; 邱六合; 李世昌; 孫如瑩
• 作者服務機構： 大同工學院材料工程研究所
• 中文摘要： 本研究針對航太工業材料超塑性7475鋁合金之擴散接合進行探討，其接合方式包括固相擴散接合和過渡液相擴散接合兩種。其中過渡液相擴散接合之方式乃是以鋅金屬作為中間夾層，而中間層除了使用20μm之鋅箔外，亦有利用7475板料表面處理後電渡鋅來達到目的，試片之表面處理則以鋅置換方式作前處理以防止母材表面形成緻密之氧化膜阻礙接合，並經由XRD、GDOS和OM來作表面分析；而固相擴散接合則不需中間夾層。擴散接合條件包括：試片之表面粗糙度(Rm)為1.85μm和8.6μm，夾層鋅膜厚分別由0到20μm，並在760、和torr之不同真空環境下進行，於515°C和530°C，1-3 MPa壓力下作0.5到6小時之靜壓接合研究；接合後試片藉由接合面之微觀組織觀察以及剪力強度測試加以評估。實驗結果顯示，經由適當的接合條件和表面處理，固相擴散接合之7475鋁合金接合強度可高達90%以上之母材強度。
• 英文摘要： In this study two bonding techniques are studied using a superplastic 7475 A1 alloy, including solidstate diffusion bonding (SSDB) and transient liquid phase bonding (TLPB) using a thin Zn interlayer.Interlayers of Zn measuring 20 μm in thickness for TLPB were obtained using a mill rolling process whileZn interlayers with thickness equal to or less than 10 μm were obtained by direct electroplating of Znonto the 7475 A1 alloy. Diffusion bonding of 7475 A1 alloy specimens was carried out under a varietyof bonding parameters, including surface roughness of 1.85 and 8.6 μm in the Rm scale, a degree of vacuumof 760, and torr, uniaxial pressures of 1,2 and 3 MPa, bonding times from 0.5 to 6 hours, bondingtemperatures of 515 and 530°C and zinc interlayers 0 to 20 μm in thickness. Characterizations of zinccoatings and the chemical species absorbed in or formed on the surface layer of 7475 A1 alloy specimenswere obtained using XRD, GDOS and optical microscopy. The integrity of the bonds was examined usingoptical microscopy, and the bond strengths were evaluated using a single overlap shear test. The resultsshow that, with proper bonding conditions and surface pre-treatment, successful bonds with lap shear stress(in a T6 condition) greater than 90% of that of the parent alloy could be achieved by means of solid statediffusion bonding.
• 中文關鍵字： diffusion bonding; transient liquid phase; superplastic 7475 Al alloy; electroplating; zinc interlayer
• 英文關鍵字： --