Ron Tomer, Leon Avi, Popov Vladimir, Strokin Evgeny, Eliezer Dan, Shirizly Amnon, Aghion Eli
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.
Institute of Metals, Technion, Haifa 3200003, Israel.
Materials (Basel). 2022 Jun 7;15(12):4043. doi: 10.3390/ma15124043.
The growing interest in refractory high-entropy alloys (HEAs) in the last decade is mainly due to their thermal stability, outstanding mechanical properties, and excellent corrosion resistance. However, currently HEAs are still not considered for use as common structural materials due to their inherent drawbacks in terms of processing and machining operations. The recent progress witnessed in additive manufacturing (AM) technologies has raised the option of producing complex components made of HEAs with minimal machining processes. So far, this could be achieved by using pre-alloyed powders of HEAs that were mainly produced by a conventional arc melting furnace (AMF) in the form of small compounds that were transformed into powder via a gas atomization process. To significantly reduce the production cost, the present study aims to analyze the ability to synthesize HEA WTaMoNbV via a laser powder bed fusion (LPBF) process using mixed elemental alloying powder as the raw material. For comparison, a counterpart alloy with the same chemical composition was analyzed and produced by an AMF process. The microstructures of the tested alloys were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses. The physical properties were evaluated in terms of density and mechanical strength, while the electrochemical behavior was assessed by potentiodynamic polarization analysis. The results disclosed similarities in microstructure, physical properties and electrochemical behavior between HEA WTaMoNbV manufactured by the proposed LPBF process and its counterpart alloy produced by an AMF process.
在过去十年中，人们对难熔高熵合金（HEAs）的兴趣日益浓厚，这主要归因于它们的热稳定性、出色的机械性能和优异的耐腐蚀性。然而，由于在加工和机械加工操作方面存在固有缺陷，目前HEAs仍未被视为常用结构材料。增材制造（AM）技术的最新进展为使用最少的加工工艺生产由HEAs制成的复杂部件提供了选择。到目前为止，这可以通过使用主要由传统电弧熔炉（AMF）以小化合物形式生产的HEAs预合金粉末来实现，这些小化合物通过气体雾化过程转化为粉末。为了显著降低生产成本，本研究旨在分析使用混合元素合金粉末作为原料，通过激光粉末床熔融（LPBF）工艺合成HEA WTaMoNbV的能力。作为对比，对具有相同化学成分的对应合金进行了分析，并通过AMF工艺生产。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线衍射（XRD）分析对测试合金的微观结构进行了检查。根据密度和机械强度评估物理性能，同时通过动电位极化分析评估电化学行为。结果表明，通过所提出的LPBF工艺制造的HEA WTaMoNbV与其通过AMF工艺生产的对应合金在微观结构、物理性能和电化学行为方面具有相似性。
