纳米镍基催化剂母合金的快速凝固过程微观结构研究

为了获得高效、环境友好的纳米微晶骨架镍催化材料，采用电弧感应重熔技术以及快速凝固技术制备了纳米微晶的NiAl母合金条带，并通过XRD、SEM等分析技术揭示了NiAl合金快速凝固过程的相组成以及显微结构变化规律。研究表明,在合金成分一定时，快淬的冷却速率对合金的相组成、相对含量以及微观结构有着重要的影响，考虑到加工条件，通常以30 m·s－1为佳，此时合金中有效相Al3Ni2相对含量达到最大，晶粒细小，部分非晶化。

Study on microstructure of master alloy for nanoscale nickel-based catalysts during the rapid-quenching process

NiAl mother alloys for catalytic materials were prepared by arc-melting and melt-quenching. Phase transformation and microstructures of the alloys during quenching process were investigated by XRD and SEM. The results showed that, at a certain NiAl alloy composition, quenching speed of the melt-spun has significant effects on phase composition, relative content and microstructure of the alloys. Considering the processing conditions, favorable quenching speed is 30 m·s－1, where the effective phase Al3Ni2 in alloy is maximal and grains of the alloy are very small and partially amorphous.