Popa Florin, Marinca Traian Florin, Sechel Niculina Argentina, Frunză Dan Ioan, Chicinaș Ionel
Department of Materials Science and Engineering, Technical University of Cluj-Napoca, 103-105 Muncii Avenue, 400641 Cluj-Napoca, Romania.
Materials (Basel). 2024 Sep 3;17(17):4355. doi: 10.3390/ma17174355.
FeMnSn Heusler alloy, obtained by mechanical alloying, was subjected to larger milling times in the range of 30-50 h to study the phase stability and morphology. X-ray diffraction studies have shown that the milled samples crystallise in a disordered A structure. The A structure was found to be stable in the milling range studied, contrary to the computation studies performed on this composition. Using Rietveld refinements, the lattice parameter, mean crystallite size, and lattice strain were computed. The nature of the obtained phases by milling was found to be nanocrystalline with values below 50 nm. A linear increase rate of 0.00713 (h) was computed for lattice strain as the milling time increased. As the milling time increases, the lattice parameter of the cubic Heusler was found to have a decreasing behaviour, reaching 2.9517 Å at 50 h of milling. The morphological and elemental distribution-characterised by scanning electron microscopy and energy-dispersive X-ray spectroscopy-evidenced Mn and Sn phase clustering. As the milling time increased, the morphology of the sample was found to change. The Mn and Sn cluster size was quantified by elemental line profile. Electrical resistivity evolution with milling time was analysed, showing a peak for 40 h of milling time.
通过机械合金化获得的FeMnSn赫斯勒合金，在30 - 50小时范围内进行更长时间的球磨，以研究其相稳定性和形态。X射线衍射研究表明，球磨后的样品结晶为无序的A结构。与对该成分进行的计算研究相反，在所研究的球磨范围内发现A结构是稳定的。使用Rietveld精修法计算了晶格参数、平均微晶尺寸和晶格应变。发现球磨得到的相的性质为纳米晶，其值低于50 nm。随着球磨时间的增加，计算出晶格应变的线性增加速率为0.00713 (/h)。随着球磨时间的增加，发现立方赫斯勒合金的晶格参数呈下降趋势，在球磨50小时时达到2.9517 Å。通过扫描电子显微镜和能量色散X射线光谱对形态和元素分布进行表征，证明了Mn和Sn相的聚集。随着球磨时间的增加，发现样品的形态发生了变化。通过元素线轮廓对Mn和Sn团簇尺寸进行了量化。分析了电阻率随球磨时间的变化，结果表明在球磨40小时时出现一个峰值。
