Abstract Nb-18Si-24Ti-2Cr-2Al-2Hf (at.%) alloy was fabricated by selective laser melting (SLM). Results showed that an ultra-fined microstructure was achieved by SLM. After oxidation at 1250 °C for 50 h, the weight gains of Nb-Si based alloys via SLM and vacuum induction melting (VIM) were 96.48 mg/cm 2 and 198.91 mg/cm 2 , respectively. Compared with the VIM alloy, the SLM alloy exhibited a slower oxidation kinetic rate, featured by the formation of a more compact oxide scale without spallation. The improvement in the oxidation resistance was attributed to the microstructure refinement.

中文翻译：

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选择性激光熔化提高 Nb-Si 基合金的抗氧化性

摘要 Nb-18Si-24Ti-2Cr-2Al-2Hf (at.%)合金采用选择性激光熔化(SLM)方法制备。结果表明，SLM 实现了超细微结构。在 1250 °C 下氧化 50 小时后，Nb-Si 基合金通过 SLM 和真空感应熔炼 (VIM) 的增重分别为 96.48 mg/cm 2 和 198.91 mg/cm 2 。与VIM合金相比，SLM合金表现出更慢的氧化动力学速率，其特点是形成更致密的氧化皮而没有散裂。抗氧化性的提高归因于微观结构的细化。