纳秒激光改性大块金属玻璃的实验研究

J. Ma, M. P. Jahan, S. Lei, Mark Gueli
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引用次数: 0

摘要

大块金属玻璃(BMG)是一种较新的工程材料,因其非晶态结构、优良的力学性能(即高弹性、硬度和断裂韧性)和耐腐蚀性而越来越受到人们的欢迎。bmg的一些最新和有前景的应用领域包括生物医学植入物、核反应堆、空间和电子应用。因此,bmg的可加工性和表面处理已成为一个重要的研究领域。在本研究中,使用波长为1064nm的纳秒激光对zr基块状金属玻璃表面进行修饰。(Zr67Cul0.6Ni9.8Ti8.8Be3.8)。评估了激光脉冲能级和透镜到样品的距离对弹坑和狭缝形成的影响。激光系统采用单次发射模式产生弹坑,共使用6个激光脉冲能级。此外,还选择了三个镜头到样本的距离值。这六个能级分别为0.053 J、0.122 J、0.296 J、0.415 J、0.526 J和0.662 J。三个不同的透镜到样品的距离值分别为150mm、170mm和190mm。镜头焦距为150mm。采用激光系统的连续射击方式加工BMG上的槽。对于狭缝成形,使用两个能级(0.296 J和0.662 J)和透镜与工件之间的两个距离值(150 mm和190 mm)以及两种不同的重叠比(0.75和0.95)。在修改后的BMG表面上,一个有趣的观察结果是陨石坑边缘的波纹形成,而陨石坑中心的表面相对光滑。与透镜与工件之间的其他距离相比,使用焦距(150 mm)的改进表面在边缘产生了更多皱褶或波纹的陨石坑。狭缝形成波纹的特征也保持不变,尽管波纹的形成强度或波纹的数量有所减少。最后,利用三维表面轮廓仪研究了弹坑深度随激光参数的变化规律。利用扫描电子显微镜(SEM)和能量色散x射线能谱(EDS)分析研究了BMG表面的表面形貌、波纹形成、表面修饰和激光诱导的元素组成。
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Experimental Investigation of Nanosecond Laser Modification of Bulk Metallic Glass
Bulk metallic glass (BMG), a comparatively new engineering material, is gaining popularity for its amorphous structure, improved mechanical properties, (i.e., high elasticity, hardness, and fracture toughness), and corrosion resistance. Some of the recent and prospective areas of applications of BMGs include biomedical implants, nuclear reactor, and space and electronic applications. As a result, machinability and surface treatment of BMGs have become an important area of research. In this study, a nanosecond laser with 1064 nm wavelength is used to modify the surface of a Zr-based bulk metallic glass Vitreloy 1b. (Zr67Cul0.6Ni9.8Ti8.8Be3.8). The effects of laser pulse energy level and the lens-to-sample distance on the crater and slot forming are assessed. Single shot mode of the laser system is used to generate craters, and totally six laser pulse energy levels are used. In addition, three lens-to-sample distance values are selected. These six energy levels are 0.053 J, 0.122 J, 0.296 J, 0.415 J, 0.526 J, and 0.662 J. The three different lens-to-sample distance values are 150 mm, 170 mm, and 190 mm. The focal length of the lens is 150 mm. Continuous shot mode of the laser system is used to machine slots on the BMG. For slot forming, two energy levels (0.296 J and 0.662 J) and two distance values between the lens and the workpiece (150 mm and 190 mm) along with two different overlapping ratios (0.75 and 0.95) are used. An interesting observation on the modified surface of BMG is the ripple formation at the edge of the craters, while the center of the crater has comparatively a smoother surface. The modified surface using focal length (150 mm) generated craters with higher number of wrinkles or ripples at the edge compared to the other distances between the lens and the workpiece. The characteristic of formation of ripples remains the same for slot forming also, although the intensity of ripple formation or number of ripples is decreased. Finally, a 3D surface profilometer is used to study the variation of crater depth with laser parameters. The scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS) analyses are used to investigate surface topography, ripple formation, surface modification, and laser-induced elemental composition on the BMG surfaces.
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