Liu Bing, Yao Cong, Kang Jingtao, Li Ruidi, Niu Pengda
Wuhan Second Ship Design and Research Institute, Wuhan 430064, China.
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Materials (Basel). 2023 Dec 27;17(1):131. doi: 10.3390/ma17010131.
Fe-Mn-Si shape memory alloys (SMAs) have gained significant attention due to their unique characteristics. However, there remains a gap in the literature regarding the fabrication of these alloys using laser-directed energy deposition (LDED). This study fills this void, investigating the properties of Fe-Mn-Si SMAs produced by LDED. The shape memory performance of as-deposited Fe-Mn-Si SMAs was studied using a tensile method. Alloys underwent different degrees of deformation to assess their shape memory effect. Microstructural evaluations were conducted post-deformation to observe the internal structures of the alloys. The tensile tests revealed that shape recovery rates for deformation levels of 3%, 7%, 11%, and 15% were 68.1%, 44.2%, 31.7%, and 17.6%, respectively. Notably, the maximum recoverable deformation of the LDED-formed Fe-Mn-Si-based shape memory alloy reached 3.49%, surpassing the traditional deformation processing SMAs (<3%). The presence of a significant number of stacking faults was linked to the enhanced shape memory performance. The LDED technique demonstrates promising potential for the fabrication of Fe-Mn-Si SMAs, producing alloys with enhanced shape memory performance compared to traditionally processed SMAs. The study's findings offer new insights and broaden the applicability of LDED in the field of SMAs.
铁锰硅形状记忆合金（SMAs）因其独特的特性而备受关注。然而，关于使用激光定向能量沉积（LDED）制造这些合金的文献仍存在空白。本研究填补了这一空白，研究了通过LDED生产的铁锰硅形状记忆合金的性能。采用拉伸法研究了沉积态铁锰硅形状记忆合金的形状记忆性能。合金经历了不同程度的变形以评估其形状记忆效应。变形后进行微观结构评估，以观察合金的内部结构。拉伸试验表明，3%、7%、11%和15%变形水平下的形状恢复率分别为68.1%、44.2%、31.7%和17.6%。值得注意的是，LDED形成的铁锰硅基形状记忆合金的最大可恢复变形达到3.49%，超过了传统变形加工的形状记忆合金（<3%）。大量堆垛层错的存在与增强的形状记忆性能有关。LDED技术在制造铁锰硅形状记忆合金方面显示出有前景的潜力，与传统加工的形状记忆合金相比，生产出具有增强形状记忆性能的合金。该研究结果提供了新的见解，并拓宽了LDED在形状记忆合金领域的适用性。
