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arXiv 1710.08855cond-mat.mtrl-sci
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通过高通量laser沉积方法生产的AlxCoCrFeNi高熵合金的微观结构和机械性能变化的评估

Evaluation of microstructure and mechanical property variations in AlxCoCrFeNi high entropy alloys produced by a high-throughput laser deposition method

Mu Li, Jaume Gazquez, Albina Borisevich, Rohan Mishra, Katharine M. Flores

摘要:

21个不同的AlxCoCrFeNi合金快速制备激光合金化等原子CoCrFeNi基板Al粉末,以创建一个合金库,范围为x=0.15-1.32。采用X射线衍射、扫描电子显微镜、扫描透射电子显微镜和纳米压痕技术研究了晶体结构、微观结构和力学性能的变化。随着Al含量的增加,晶体结构从无序的FCC转变为无序的BCC和有序的B2结构的混合物。虽然BCC/B2形成的开始与先前报道的铸造合金一致,但在激光处理的材料中在较大的Al含量下观察到FCC结构,从而导致更宽的两相区。在这些高Al含量下,FCC相主要局限于BCC/B2晶界。FCC相的纳米压痕模量和硬度随着Al含量的增加而增加,而BCC/B2结构的性能对组成不敏感。激光处理的合金的结构和机械性能与铸造合金的报告结果惊人地一致,证明了将这种高通量方法应用于多组分合金设计的可行性。

英文摘要:

Twenty-one distinct AlxCoCrFeNi alloys were rapidly prepared by laser alloying an equiatomic CoCrFeNi substrate with Al powder to create an alloy library ranging x=0.15-1.32. Variations in crystal structure, microstructure and mechanical properties were investigated using X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy and nanoindentation. With increasing Al content, the crystal structure transitioned from a disordered FCC to a mixture of disordered BCC and ordered B2 structures. While the onset of BCC/B2 formation was consistent with previously reported cast alloys, the FCC structure was observed at larger Al contents in the laser processed materials, resulting in a wider two phase regime. The FCC phase was primarily confined to the BCC/B2 grain boundaries at these high Al contents. The nanoindentation modulus and hardness of the FCC phase increased with Al content, while the properties of the BCC/B2 structure were insensitive to composition. The structure and mechanical properties of the laser-processed alloys were surprisingly consistent with reported results for cast alloys, demonstrating the feasibility of applying this high-throughput methodology to multicomponent alloy design.

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