【摘要】 近年来,AlxCoCrFeNi系高熵合金因其独特的成分和优异的性能而获得学者们的广泛关注。与传统铸造工艺制备的高熵合金相比,增材制造高熵合金具备生产效率高和力学性能优异的特点,为该系高熵合金的研发和应用带来了广阔的前景。然而,增材制造高熵合金的发展时间较短,亟需对其进行深入的研究和探索。本文对增材制造AlxCoCrFeNi系高熵合金的最新研究进展进行了综述,主要包含粉末制备、打印工艺、组织与性能、应用和展望等方面。首先,介绍了高熵合金的基础知识和增材制造的主流方法;其次,总结了预合金化粉末的常见工艺及粉末的特性;然后,阐述了选区激光熔化法(SLM)、定向能量沉积法(DED)、激光熔覆法等工艺参数,其中包括体积能量密度、激光功率、扫描速度、扫描策略等,同时分析了不同工艺参数下增材制造高熵合金的微观组织特征、力学性能和电化学性能等;最后,指出了现阶段该增材制造高熵合金存在的问题,提出将来的研究重点和方向。更多还原

【Abstract】 Recently, more and more researchers pay attention on the research of high entropy alloys(HEAs) of AlxCoCrFeNi system due to their unique composition and excellent performance. When compared with traditional as-cast AlxCoCrFeNi HEAs, the additive manufactured counterparts generally present highly effective production and excellent mechanical properties, promoting their development and application in practice. The latest researches on the additive manufactured AlxCoCrFeNi HEAs, including their preparation of powder, printing process, microstructure and properties, applications and outlooks, are reviewed in this paper. Firstly, the fundamental introduction on the AlxCoCrFeNi HEAs and the common methods of additive manufacture are introduced in detail. Secondly, the pre-alloying powders of AlxCoCrFeNi HEAs and their characteristics are summarized. Thirdly, the printing parameters and the properties of additive manufactured AlxCoCrFeNi HEAs fabricated by the selective laser melting(SLM), directed energy deposition(DED) and laser cladding are discussed to clarify the influence of volume energy density, laser power, scanning velocity and scanning strategies on their properties and the possible defects. Besides, microstructure, mechanical and corrosion properties of additive manufactured AlxCoCrFeNi HEAs are analyzed. Finally, the application prospects of AlxCoCrFeNi HEAs in various fields are summarized, and also the existing problems in current studies, the research emphasis and research direction of research in the future are pointed out.更多还原