Microstructural evolution mechanisms of Ti600 and Ni-25%Si joint brazed with Ti-Zr-Ni-Cu amorphous filler foil

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• 作者：Xiaopeng Li^a ; Houqin Wang^a ; Ting Wang^b ; ^{fgwangting@163.com" class="auth_mail" title="E-mail the corresponding author} ; Binggang Zhang^a ; ^{zhangbg@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Tao Yu^a ; Ruishan Li^a
• 关键词：Ti600 alloy ; Ni-25at%Si alloy ; Ti-Zr-Ni-Cu amorphous filler foil ; Brazing ; Interfacial microstructure ; Evolution mechanism
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：414-419
• 全文大小：3251 K

文摘

A commercial Ti-Zr-Ni-Cu amorphous filler foil was applied to braze the high-temperature Ti600 and Ni-25at%Si, resulting in the good joint between both of alloys. The interfacial microstructure of Ti600/Ti-Zr-Ni-Cu/Ni-25at%Si brazed joint at 1213 K for 10 min is mainly comprised of the continuous Ti₂Ni phase. Most of Ti-rich phases such as α-Ti, β-Ti, Ti₃Al, Ti₂Ni, (Ti,Zr)₂(Ni,Cu) and (Ti,Zr)₂Si formed in the vicinity of the Ti600 substrate except that Ti₅Si₃ precipitates near the Ni-25at%Si region, resulting in the formation of six distinct layers. The corresponding formation mechanism were clarified. The Ti₅Si₃ and Ni₃₁Si₁₂ were firstly formed during the initial stage followed by diffusion reactions at Ni-25at%Si side. The continuous Ti₂Ni phase formed through the reaction of Ti_(L) + Ni_(L) → Ti₂Ni. α-Ti, Ti₃Al, (Ti,Zr)₂(Ni,Cu) and (Ti,Zr)₂Si in the brazing joint precipitated through a solid-solid phase transformation.