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Fusion-diffusion electron beam welding of aluminum‑lithium alloy with Cu nano-coating
Materials & Design ( IF 8.4 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.matdes.2019.108439
Guoqing Chen , Qianxing Yin , Ge Zhang , Binggang Zhang

Abstract As a new method to reduce the temperature in melt pool and subsequently alleviate the Li evaporation loss, fusion-diffusion electron beam welding is proposed for aluminum‑lithium alloy joining achieved by defocused electron beam and pressure. The Li evaporation loss, which was only 9%, was significantly suppressed compared to the ordinary electron beam welding. However, joining failed within the unfused region due to the poor atomic diffusion. As a result, Cu nano-coating, with a 300 nm thickness, was sputtered to the butt surface of base metal to accelerate atomic diffusion. After adding Cu nano-coating, the unfused region achieved an effective joining since the eutectic α-Al + Al2Cu appeared at 821 K, indicating that an equiaxed crystal zone, which joined two base metals, was formed at unfused region. Reasons for the presence of equiaxed crystal zone were examined. Dispersed strengthening phases including θ′ (Al2Cu) and T1 (Al2CuLi) were observed to be present in both the fusion zone and equiaxed crystal zone, corresponding to a higher tensile strength and increased hardness value in equiaxed crystal zone.

中文翻译:

Cu纳米涂层铝锂合金的熔扩散电子束焊接

摘要 作为一种降低熔池温度并进而减轻锂蒸发损失的新方法,提出了一种通过离焦电子束和压力实现铝-锂合金连接的熔融扩散电子束焊接。与普通电子束焊接相比,仅 9% 的锂蒸发损失得到显着抑制。然而,由于原子扩散差,未融合区域内的连接失败。结果,厚度为 300 nm 的 Cu 纳米涂层被溅射到贱金属的对接表面以加速原子扩散。添加Cu纳米涂层后,未熔合区域实现了有效连接,因为共晶α-Al + Al2Cu出现在821 K,表明在未熔合区域形成了连接两种基体金属的等轴晶区。检查了等轴晶区存在的原因。观察到包括θ'(Al2Cu)和T1(Al2CuLi)在内的分散强化相存在于熔合区和等轴晶区,对应于等轴晶区更高的抗拉强度和增加的硬度值。
更新日期:2020-03-01
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