Geambazu Laura Elena, Manea Ciprian Alexandru, Mateș Ileana Mariana, Pătroi Delia, Sbârcea Gabriela Beatrice, Manta Eugen, Semenescu Augustin
National Institute for R&D in Electrical Engineering ICPE-CA Bucharest, Splaiul Unirii 313, 030138 Bucharest, Romania.
Faculty of Materials Science and Engineering, National University for Science & Technology Politehnica Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
Materials (Basel). 2025 Apr 24;18(9):1936. doi: 10.3390/ma18091936.
This study aims to investigate the Co content on a CoCrFeNiMo (x = 0; 0.5) high entropy alloy (HEA) but also the effects of replacing the Co element with Al in terms of single-phase structure forming, processing behavior, and microstructural characteristics when being processed by mechanical alloying with a planetary ball mill. Recent HEA-related research aimed toward identifying the effect that certain alloying elements in different concentrations influence the microstructure and properties but also regulate their composition. HEAs present promising properties (e.g., corrosion and wear resistance) being applicable in domains that require protection against harsh environmental conditions, benefiting from the specific core effects of this type of material. To obtain a high alloying and homogenization degree, for this research, mechanical alloying was selected for processing the mixtures, with the aid of N-Heptane as a process control agent (PCA). The mixtures were monitored in terms of alloying degree evolution, elemental distribution, particle morphology, crystalline structure, and also technological characterization (packing ratio, free flow, and slope angle). The results indicated that a high degree of alloying was obtained after 30 h of solid-state processing, with notable crystallization of two major phases FCC and BCC identified confirming the HEA phase stability calculations.
本研究旨在研究CoCrFeNiMo（x = 0; 0.5）高熵合金（HEA）中的Co含量，以及在用行星式球磨机进行机械合金化处理时，用Al替代Co元素对单相结构形成、加工行为和微观结构特征的影响。最近关于高熵合金的研究旨在确定不同浓度的某些合金元素对微观结构和性能的影响，并调节其成分。高熵合金具有良好的性能（如耐腐蚀和耐磨性能），适用于需要抵御恶劣环境条件的领域，受益于这类材料的特定核心效应。为了获得高合金化和均匀化程度，本研究选择机械合金化借助正庚烷作为过程控制剂（PCA）来处理混合物。对混合物进行了合金化程度演变、元素分布、颗粒形态、晶体结构以及工艺特性（堆积比、自由流动性和倾斜角）等方面的监测。结果表明，经过30小时的固态加工后获得了高度合金化，确定有两种主要相FCC和BCC显著结晶，证实了高熵合金相稳定性计算结果。
