DataSet / HEAF-NiAl: Ultrafast formation of single B2 phase AlCoCrFeNi high entropy alloy films by combustion of a reactive Ni/Al multilayer as heat source

This are the main raw data and derived data for the publication "Ultrafast formation of single B2 phase AlCoCrFeNi high entropy alloy films by combustion of a reactive Ni/Al multilayer as heat source". Abstract High entropy alloy films of AlCoCrFeNi B2-ordered structure are formed during an ultrafast heating process by reactive Ni/Al multilayers. The self-propagating high-temperature reaction occurring in reactive Ni/Al multilayers after ignition represents an ultrafast heat source which is used for the transformation of a thin films Al/CoFe/CrNi multilayer structure into a single phase high entropy alloy film. The materials design of the combined multilayers thus determines the phase formation. Conventional rapid thermal annealing transforms the multilayer into a film with multiple equilibrium phases. Ultrafast combustion synthesis produces films with ultrafine-grained single-phase B2-ordered compound alloy. The heating rates during the combustion synthesis are in the order of one million K/s, much higher than those of the rapid thermal annealing, which is in the order of about 7 K/s. The results are compared with differential scanning calorimetry experiments with heating rates ranging from about 100 K/s up to 25000 K/s. It is shown that the heating rate clearly determines the phase formation in the multilayers. The rapid kinetics of the combustion prevents long-range diffusion and promotes the run-away transformation. Thus, multilayer combustion synthesis using reactive Ni/Al multilayer as heat source represents a new pathway for the fabrication of single phase high-entropy alloy films.

本数据集包含论文《以反应性Ni/Al多层膜为热源超快制备单相B2相AlCoCrFeNi高熵合金（High Entropy Alloy）薄膜》的核心原始数据与衍生数据。
摘要 本研究通过反应性Ni/Al多层膜引发的超快加热过程，制备得到具有B2有序结构的AlCoCrFeNi高熵合金薄膜。反应性Ni/Al多层膜经点火后发生的自蔓延高温反应（self-propagating high-temperature reaction）可作为超快热源，将Al/CoFe/CrNi多层薄膜结构转化为单相高熵合金薄膜。因此，复合多层膜的材料设计直接决定了物相的生成过程。
传统快速热退火（Rapid Thermal Annealing，RTA）工艺会将多层膜转化为含多相平衡结构的薄膜；而超快燃烧合成法则可制备得到超细晶粒单相B2有序复合合金薄膜。燃烧合成过程中的加热速率可达10^6 K/s量级，远高于快速热退火工艺（约7 K/s）。本研究将实验结果与加热速率范围约100 K/s至25000 K/s的差示扫描量热法（Differential Scanning Calorimetry，DSC）实验结果进行对比，结果表明，加热速率是决定多层膜物相生成的核心因素。燃烧合成的超快动力学过程可抑制长程扩散，促进失控相变。因此，以反应性Ni/Al多层膜为热源的多层膜燃烧合成法，为单相高熵合金薄膜的制备提供了全新途径。