Popa Florin, Marinca Traian Florin, Sechel Niculina Argentina, Frunzӑ Dan Ioan, Chicinaș Ionel
Department of Materials Science and Engineering, Technical University of Cluj-Napoca, 103-105 Muncii Avenue, 400641 Cluj-Napoca, Romania.
Nanomaterials (Basel). 2024 Jul 6;14(13):1156. doi: 10.3390/nano14131156.
A NiMnSn Heusler alloy was obtained as a single B phase after 12 h of mechanical milling. The influence of prolonged milling on the phase stability was analysed for milling times up to 50 h, related to mean crystallite size, lattice strain, and electrical resistivity. The nature of the powders in the milled range was found to be nanocrystalline, with a mean crystallite size of about 33 ± 2 nm. An evaluation of the internal stresses induced by milling was performed, a linear behaviour was found, and a coefficient of the internal stress increase with milling time was proposed. Particle size distributions of milled samples were analysed, and the morphology of the powders was visualised by scanning electron microscopy. The elemental distribution of milled samples was quantified by energy-dispersive X-ray spectroscopy. Electrical resistivity measurements were performed on compacted samples, and their behaviour with milling time was analysed.
经过12小时的机械研磨后，获得了一种NiMnSn休斯勒合金单相B相。分析了长达50小时的延长研磨对相稳定性的影响，这与平均微晶尺寸、晶格应变和电阻率有关。发现在研磨范围内粉末的性质为纳米晶，平均微晶尺寸约为33±2纳米。对研磨引起的内应力进行了评估，发现其具有线性行为，并提出了内应力随研磨时间增加的系数。分析了研磨样品的粒度分布，并通过扫描电子显微镜观察了粉末的形态。通过能量色散X射线光谱法定量了研磨样品的元素分布。对压实样品进行了电阻率测量，并分析了其随研磨时间的变化行为。
