State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People's Republic of China.
Nanoscale Res Lett. 2008 Nov 6;4(1):11-6. doi: 10.1007/s11671-008-9195-4.
We have successfully synthesized bulk nanostructured Fe94.3B5.7 alloy using the one-step approach of a self-propagating high temperature synthesis (SHS) combining a rapid cooling technique. This method is convenient, low in cost, and capable of being scaled up for processing the bulk nanostructured materials. The solidification microstructure is composed of a relatively coarse, uniformly distributed dendriteto a nanostructured eutectic matrix with α-Fe(B) and t-Fe2B phases. The fine eutectic structure is disorganized, and the precipitation Fe2B is found in the α-Fe(B) phase of the eutectic. The dendrite phase has the t-Fe2B structure rather than α-Fe(B) in the Fe94.3B5.7 alloy, because the growth velocity of t-Fe2B is faster than that of the α-Fe with the deeply super-cooling degree. The coercivity (Hc) and saturation magnetization (Ms) values of the Fe94.3B5.7 alloy are 11 A/m and 1.74T, respectively. Moreover, the Fe94.3B5.7 alloy yields at 1430 MPa and fractures at 1710 MPa with a large ductility of 19.8% at compressive test.
我们成功地使用自蔓延高温合成（SHS）的一步法合成了块状纳米结构 Fe94.3B5.7 合金，结合了快速冷却技术。这种方法方便、成本低，并且能够大规模加工块状纳米结构材料。凝固组织由相对较粗、均匀分布的树枝晶组成，具有纳米结构的共晶基体，由 α-Fe(B)和 t-Fe2B 相组成。精细的共晶结构是无组织的，并且在共晶的 α-Fe(B)相中发现了沉淀的 Fe2B。在 Fe94.3B5.7 合金中，枝晶相具有 t-Fe2B 结构而不是 α-Fe(B)，因为 t-Fe2B 的生长速度比具有深过冷度的 α-Fe 快。Fe94.3B5.7 合金的矫顽力（Hc）和饱和磁化强度（Ms）值分别为 11 A/m 和 1.74T。此外，Fe94.3B5.7 合金在压缩试验中具有 1430 MPa 的屈服强度和 1710 MPa 的断裂强度，以及 19.8%的大延展性。
