Svoboda Jiří, Gamanov Štepán, Bártková Denisa, Luptáková Natália, Bořil Petr, Jarý Milan, Mašek Bohuslav, Holzer Jakub, Dymáček Petr
Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic.
CEITEC, Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic.
Materials (Basel). 2022 Dec 17;15(24):9034. doi: 10.3390/ma15249034.
Mechanical alloying (MA) of powders represents the first processing step in the production of oxide dispersion-strengthened (ODS) alloys. MA is a time and energy-consuming process also in the production of Fe-10Al-4Cr-4YO creep and oxidation-resistant ODS nanocomposite, denoted as the FeAlOY, and it deserves to be optimized. MA is performed at two different temperatures at different times. The powder after MA, as well as the microstructure and high-temperature strength of the final FeAlOY, are characterized and the optimal MA conditions are evaluated. The obtained results show that the size distribution of the powder particles, as well as the dissolution and homogenization of the YO, becomes saturated quite soon, while the homogenization of the metallic components, such as Al and Cr, takes significantly more time. The high-temperature tensile tests and grain microstructures of the secondary recrystallized FeAlOY, however, indicate that the homogenization of the metallic components during MA does not influence the quality of the FeAlOY, as the matrix of the FeAlOY is sufficiently homogenized during recrystallization. Thus, the conditions of MA correspond to sufficient dissolution and homogenization of YO and can be considered the optimal ones.
粉末的机械合金化（MA）是氧化物弥散强化（ODS）合金生产中的第一步加工工序。在生产Fe-10Al-4Cr-4YO蠕变及抗氧化ODS纳米复合材料（即FeAlOY）时，MA也是一个耗时耗能的过程，因此值得优化。MA在两个不同温度下于不同时间进行。对MA后的粉末以及最终FeAlOY的微观结构和高温强度进行了表征，并评估了MA的最佳条件。所得结果表明，粉末颗粒的尺寸分布以及YO的溶解和均匀化很快就会达到饱和，而Al和Cr等金属成分的均匀化则需要更多时间。然而，二次再结晶FeAlOY的高温拉伸试验和晶粒微观结构表明，MA过程中金属成分的均匀化并不影响FeAlOY的质量，因为FeAlOY的基体在再结晶过程中已充分均匀化。因此，MA的条件对应于YO的充分溶解和均匀化，可被视为最佳条件。
