Wire-based directed energy deposition of NiTiTa shape memory alloys: Microstructure, phase transformation, electrochemistry, X-ray visibility and mechanical properties
Wire-based directed energy deposition of NiTiTa shape memory alloys: Microstructure, phase transformation, electrochemistry, X-ray visibility and mechanical properties
复制标题
NiTiTa 形状记忆合金的线基定向能量沉积：微观结构、相变、电化学、X 射线可见度和机械性能
DOI：
10.1016/j.addma.2022.103115
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发表时间：
2022-10-03
影响因子：
11
通讯作者：
Ao, Sansan
中科院分区：
文献类型：
--
作者：
Zuo, Xinde;Zhang, Wei;Ao, Sansan
采用丝弧添加制造(WAAM)技术制备了NiTiTa(2.5at.首次以市售镍钛丝和钽箔为原料制备了形状记忆合金(SMA)。Ta的加入显著提高了相变温度，形成了由B19‘马氏体和B2奥氏体组成的室温组织，(Ti，Ta)2Ni析出物分布在晶界。与WAAM制备的NiTi材料相比，NiTiTa材料的腐蚀电位(Ecorr)从-0.55 V增加到-0.44 V，腐蚀电流密度(Icorr)从1.90×10-6下降到4.2×10-7A/cm2。X射线亮度由19.6%提高到56.4%。这些结果表明，Ta的加入可以提高NiTiTa零件的耐蚀性和X射线能见度。此外，WAAM制备的NiTiTa材料在10次加载-卸载循环下仍能保持稳定的超弹性响应，突出了其在生物医学领域的巨大潜在应用价值。我们的工作为通过WAAM添加制造NiTi基多组分SMA提供了一种创新的方法。
Wire and arc additive manufacturing (WAAM) technology was used for the fabrication of NiTiTa (2.5 at. % Ta) shape memory alloys (SMAs) for the first time, using commercialy available NiTi wire and Ta foil as the feedstock materials. The addition of Ta significantly increased the phase transformation temperatures, leading to a room -temperature microstructure composed of both B19 ' martensite and B2 austenite, and (Ti,Ta)2Ni precipitates distributed at the grain boundaries. Compared with the WAAM fabricated NiTi counterpart, the corrosion po-tential (Ecorr) of the NiTiTa material increased from -0.55 to -0.44 V, while the corrosion current density (Icorr) decreased from 1.90 x 10-6 to 4.2 x 10- 7 A/cm2. The X-ray brightness increased from 19.6 to 56.4 %. These results indicate that the addition of Ta can enhance the corrosion resistance and X-ray visibility of NiTiTa parts. Furthermore, the WAAM fabricated NiTiTa material was able to retain a stable superelastic response under 10 loading-unloading cycles, highlighting the great potential application value in the biomedical field. Our work provides an innovative method for additively manufacturing NiTi-based multi-component SMAs through WAAM.