In the present study surface alterations of the high pressure torsion (HPT)-deformed Ti45Nb (mass%) alloy induced by laser irradiation treatment are presented. The alloy was irradiated in air, argon, and nitrogen atmosphere using the Nd:YAG laser. Laser-induced surface modifications were analyzed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), profilometric analysis, and Vickers microhardness measurements. Alloy irradiation under a low laser output energy and a low number of accumulated pulses resulted in the formation of shallow surface craters. An increase of these irradiation parameters caused the appearance of more pronounced surface craters with microcracks and hydrodynamic effects in the form of wave-like structures, ripples, and solidified droplets and consequently caused an increase in the surface roughness. The highest value of the surface roughness of 3.062 μm was attained during the alloy irradiation in argon atmosphere under 15 mJ with 150 accumulated pulses. Interaction of the laser beam with the alloy surface was accompanied by plasma formation and surface ablation due to the irradiation energy absorption. The maximal ablated target material volumes of 5.5 × 10¹⁴ nm³ and 2.6 × 10¹⁴ nm³ were observed after the irradiation under 15 mJ with 150 accumulated pulses in argon and air atmosphere, respectively. Moreover, attainment of high temperatures at the alloy surface induced its chemical composition alterations. Formation of mixed Ti- and Nb-oxide surface film and absence of nitride particles at the alloy surface was detected irrespective of the irradiation atmosphere. Irradiation in air resulted in the appearance of the most pronounced surface oxide layer with the highest microhardness value which can in great merit influence an increase of the alloy bio-integration abilities and its tribo-corrosion resistance.

在本研究中，高压扭转（HPT）变形的Ti的表面变化介绍了通过激光辐照处理诱发的45Nb（质量％）合金。使用Nd：YAG激光在空气，氩气和氮气气氛中辐照合金。激光诱导的表面改性通过场发射扫描电子显微镜（FE-SEM），能量色散光谱（EDS），轮廓分析和维氏显微硬度测量进行了分析。在低激光输出能量和少量累积脉冲的情况下进行合金辐照会导致形成浅表面凹坑。这些辐照参数的增加导致出现更明显的带有微裂纹的表面凹坑，并以波浪状结构，波纹和凝固的液滴的形式产生流体动力效应，因此导致表面粗糙度增加。表面粗糙度最高值为3。在15 mJ的氩气气氛中以150个累积脉冲对合金进行辐照时，可达到062μm。由于辐射能量的吸收，激光束与合金表面的相互作用伴随着等离子体的形成和表面的烧蚀。最大烧蚀目标材料体积为5.5×10在氩气和空气气氛中，在15 mJ下以150个累积脉冲进行辐照后，分别观察到¹⁴  nm ³和2.6×10 ¹⁴  nm ³。而且，在合金表面达到高温会引起其化学成分的改变。不论照射气氛如何，都检测到形成了混合的Ti和Nb-氧化物表面膜和在合金表面不存在氮化物颗粒。空气中的辐照导致出现了具有最高显微硬度值的最明显的表面氧化物层，这可以极大地影响合金生物整合能力及其抗摩擦腐蚀性能的提高。