Ultrastrong and ductile superalloy joints bonded with a novel composite interlayer modified by high entropy alloy

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science & Technology Pub Date : 2024-11-10 DOI:10.1016/j.jmst.2024.08.072
L. Yuan, F.Y. Jiang, D. Hao, Y.Z. Yang, T.H. Chou, J.X. Zhang, J. Gan, J.L. Li, J.T. Xiong, T. Yang
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Abstract

Diffusion bonding (DB) with interlayers is sought-after for manufacturing high-performance turbine disks of powder metallurgy (PM) superalloys with precise and intricate inner cavity structures. Developing novel interlayer materials is challenging but crucial for enhancing bonding quality and joint properties. We designed a multi-interlayer composite bonding (MICB) method, employing sandwich-structured interlayers of “BNi2/high entropy alloy (HEA)/BNi2”, to join a PM superalloy FGH98. The MICB joint exhibited an ultrahigh shear strength of ∼1132 MPa and exceptional ductility, indicating a typical ductile fracture pattern with numerous dimples. Owing to the introduction of liquid BNi2 interlayer, initial bonding interfaces were eliminated and replaced by newborn grain boundaries (GBs), preventing brittle interfacial fracture. Due to the diffusion of Al/Ti/Ta from the base metals (BMs), massive ordered γ' nanoparticles also precipitated in the joint. Moreover, the addition of HEA foil reduced the stacking fault energy (SFE) of the joint and facilitated the formation of deformation twins (DTs). Thus, during the deformation process, the γ' nanoparticles, and multiple substructures like stacking faults (SFs), Lomer-Cottrell (L-C) locks, DTs, and 9R phases enhanced the work-hardening capability and strengthened the joint. Simultaneously, the multiplication and interaction of DTs induced a softening mechanism of dynamic recrystallization (DRX) during the entire deformation process and dominated when the plastic instability occurred, resulting in numerous adiabatic shear bands (ASBs) consisting of γ/γ' nano-bands, which indicates a significant improvement of the joint ductility.

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用高熵合金改性的新型复合夹层粘接的超强韧性超级合金接头
使用中间膜进行扩散粘接(DB)是制造具有精密复杂内腔结构的高性能粉末冶金(PM)超合金涡轮盘的理想方法。开发新型夹层材料具有挑战性,但对于提高粘接质量和接头性能至关重要。我们设计了一种多夹层复合键合(MICB)方法,采用 "BNi2/高熵合金(HEA)/BNi2 "夹层结构夹层来连接粉末超合金 FGH98。MICB 接头显示出 1132 兆帕斯卡的超高剪切强度和优异的延展性,呈现出具有大量凹坑的典型韧性断裂模式。由于引入了液态 BNi2 夹层,最初的结合界面被消除,取而代之的是新生的晶界 (GB),从而防止了脆性界面断裂。由于 Al/Ti/Ta 从贱金属 (BM) 中扩散,接合处也析出了大量有序的 γ'纳米颗粒。此外,HEA 箔的加入降低了接头的堆叠断层能 (SFE),促进了变形孪晶 (DT) 的形成。因此,在变形过程中,γ'纳米颗粒以及堆叠断层(SFs)、Lomer-Cottrell(L-C)锁扣、DTs 和 9R 相等多种亚结构增强了加工硬化能力,并强化了接头。同时,在整个变形过程中,DTs 的增殖和相互作用诱导了动态再结晶(DRX)软化机制,并在塑性不稳定性发生时占据主导地位,从而产生了大量由 γ/γ' 纳米带组成的绝热剪切带(ASBs),这表明接头的延展性得到了显著改善。
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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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