College of Applied Science, Harbin University of Science and Technology, Harbin 150080, China.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Sci Rep. 2017 Feb 23;7:43387. doi: 10.1038/srep43387.
Both magnetic-field-induced reverse martensitic transformation (MFIRMT) and mechanical properties are crucial for application of Ni-Mn-Sn magnetic shape memory alloys. Here, we demonstrate that substitution of Fe for Ni can simultaneously enhance the MFIRMT and mechanical properties of Ni-Mn-Sn, which are advantageous for its applications. The austenite in NiFeMnSn shows the typical ferromagnetic magnetization with the highest saturation magnetization of 69 emu/g at 223 K. The result shows that an appropriate amount of Fe substitution can really enhance the ferromagnetism of NiMnSn alloy in austenite, which directly leads to the enhancement of MFIRMT. Meanwhile, the mechanical property significantly improves with Fe doping. When there is 4 at.% Fe added, the compressive and maximum strain reach the maximum value (approximately 725.4 MPa and 9.3%). Furthermore, using first-principles calculations, we clarify the origin of Fe doping on martensitic transformation and magnetic properties.
磁场诱导马氏体逆相变（MFIRMT）和机械性能对于镍-锰-锡形状记忆合金的应用至关重要。在这里，我们证明了用铁取代镍可以同时提高 Ni-Mn-Sn 的 MFIRMT 和机械性能，这有利于其应用。NiFeMnSn 中的奥氏体具有典型的铁磁磁化，在 223 K 时具有最高的饱和磁化强度 69 emu/g。结果表明，适量的铁取代确实可以增强奥氏体中 NiMnSn 合金的铁磁性，这直接导致 MFIRMT 的增强。同时，随着铁掺杂，机械性能显著提高。当添加 4 at.% 的铁时，压缩和最大应变达到最大值（约为 725.4 MPa 和 9.3%）。此外，通过第一性原理计算，我们阐明了铁掺杂对马氏体相变和磁性能的起源。
