Karczewski Krzysztof, Durejko Tomasz, Czujko Tomasz
Department of Advanced Materials and Technologies, Military University of Technology, ul. Gen. Urbanowicza 2, 00-908 Warsaw, Poland.
Materials (Basel). 2018 Mar 7;11(3):390. doi: 10.3390/ma11030390.
A Fe₃Al intermetallic alloy has been successfully prepared by the laser-engineered net shaping (LENS) process. The applied process parameters were selected to provide various cooling rates during the solidification of the laser-melted material. The macro- and microstructure and the micro- and macrotexture of Fe₃Al samples were investigated. The influence of the cooling rate on grain morphology and texture is discussed. For the applied cooling rate range of 0.64 × 10⁴ K/s-2.6 × 10⁴ K/s, the structure is characterized by the presence of columnar grains for which the growth is directed upwards from the substrate. The intensity of the microtexture varies with the height of the sample and the cooling rate. The intensity of the texture increases with the decrease in the cooling rate. The samples that were obtained with low and medium cooling rates are characterized by the well-developed <100> and <111> macrotextures. The Fe₃Al alloy that was produced with a high cooling rate did not show a specific texture, which is reflected in the fairly uniform distribution of the normalized density intensity. Only a very weak texture with a <100> type component was observed.
通过激光工程净成形（LENS）工艺成功制备了一种Fe₃Al金属间化合物合金。选择应用的工艺参数以在激光熔化材料凝固过程中提供不同的冷却速率。研究了Fe₃Al样品的宏观和微观结构以及微观和宏观织构。讨论了冷却速率对晶粒形态和织构的影响。对于0.64×10⁴K/s - 2.6×10⁴K/s的应用冷却速率范围，其结构的特征是存在柱状晶粒，这些晶粒从基底向上生长。微观织构的强度随样品高度和冷却速率而变化。织构强度随冷却速率的降低而增加。以低冷却速率和中等冷却速率获得的样品具有发达的<100>和<111>宏观织构。以高冷却速率生产的Fe₃Al合金未显示出特定的织构，这反映在归一化密度强度的相当均匀的分布中。仅观察到具有<100>型分量的非常弱的织构。
