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Evolution and formation mechanism of the interfacial microstructure on diffusion bonded joints of single crystal Ni-based superalloys to Ti3AlC2 ceramic with Ni interlayer
Vacuum ( IF 3.8 ) Pub Date : 2020-12-26 , DOI: 10.1016/j.vacuum.2020.110027
Jian Cao , Xiajun Guo , Xiaoqing Si , Chun Li , Jiakun Liu , Junlei Qi , Jicai Feng

Single crystal Ni-based superalloys DD3 and nanolaminated ternary ceramics Ti3AlC2 were the critical high-temperature structural materials, so the bonding of them is of great significance in promoting their potential applications at elevated temperatures. A strong DD3/Ti3AlC2 joint with the average shear strength of 86.4 MPa was obtained by vacuum diffusion bonding using the Ni interlayer at 900 °C for 60 min. The joint microstructure and its formation mechanism were investigated in detail. Especially, the role of Ni diffusion in the process of forming a mixed phase zone at the Ti3AlC2 interface was clarified. The diffusion zone adjacent to the DD3 was mainly composed of (Ni)ss, where Al and Ti existed mainly in the form of solid solution. In contrast, a more complex diffusion process occurred at the Ti3AlC2 interface. A Ni3Al single layer and a mixed phases zone, containing Ni3Al, AlNi2Ti and TiC, were formed from the Ni interlayer to the Ti3AlC2 substrate. Ni had a strong tendency to diffuse along grain boundaries of the Ti3AlC2 substrate, leading to the decomposition of its nanolaminated structure. Along with inward-diffusion of Ni, the Ni3Al phase was mainly formed, and a small amount of AlNi2Ti and TiC were also formed.



中文翻译:

单晶Ni基高温合金与Ni层间Ti 3 AlC 2陶瓷扩散键合界面组织的演变及形成机理

单晶镍基高温合金DD3和纳米叠层三元陶瓷Ti 3 AlC 2是关键的高温结构材料,因此它们的结合对于促进其在高温下的潜在应用具有重要意义。通过使用Ni夹层在900°C下真空扩散粘结60分钟,获得了平均剪切强度为86.4 MPa的强DD3 / Ti 3 AlC 2接头。详细研究了接头的微观结构及其形成机理。特别地,阐明了Ni扩散在Ti 3 AlC 2界面处形成混合相区的过程中的作用。与DD3相邻的扩散区主要由(Ni)组成ss,其中Al和Ti主要以固溶体形式存在。相反,在Ti 3 AlC 2界面发生了更复杂的扩散过程。从Ni中间层到Ti 3 AlC 2衬底形成Ni 3 Al单层和包含Ni 3 Al,AlNi 2 Ti和TiC的混合相区。Ni具有沿Ti 3 AlC 2衬底的晶界扩散的强烈趋势,导致其纳米层状结构的分解。随着Ni向内扩散,主要形成Ni 3 Al相,并且少量AlNi 2形成。还形成了Ti和TiC。

更新日期:2020-12-30
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