Ultrasonic Vibration Assisted Surface Texturing of Bulk Metallic Glasses for Enhancing Tribological Performance

超声波振动辅助块体金属玻璃的表面纹理以增强摩擦学性能

• 批准号: RGPIN-2018-04911
• 负责人: Jin, Xiaoliang
• 金额: $ 3.93万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760197
• 关键词: Ultrasonic; Vibration; Assisted; Surface; Texturing

My long-term research goal is to advance the understanding of the mechanics and the material response in precision manufacturing processes, in order to enhance the component surface quality including topography and microstructural property. In the next five years, my research will focus on the fundamental mechanisms in surface texturing of bulk metallic glasses (BMGs) with ultrasonic vibration assistance.BMGs are a new category of metal alloys with non-crystalline structure. BMGs have been increasingly used in various industrial applications, e.g. the bearing components. Surface texturing is a technique to generate repeated surface patterns which act as lubricant reservoirs to benefit the tribological performance of the bearing system. Existing surface texturing processes such as chemical etching and laser texturing are not suitable for BMGs because of their adverse environmental impact and process induced microstructure modification. Mechanical machining is able to achieve textured surface while keeping the original material phase. The main challenges of mechanical texturing are tool tip fracture and surface damages caused by the impact force. To overcome this barrier, a new texturing technique using high-feed milling with ultrasonic vibration assistance (VA) is proposed. VA modifies the tool tip trajectory and extensively reduces the chip load. It is hypothesized that the VA enhances the transition of BMG deformation from inhomogeneous to homogeneous mode, therefore reducing the surface damage. There is knowledge gap in understanding how the process parameters in surface texturing quantitatively influence the texture geometry and the surface quality.The following research plan is proposed: (1) a new micro-indentation technique with ultrasonic vibration feature will be developed to identify the constitutive behavior of BMG under large strain, high strain rate, varying temperature and repeated load; (2) the effect of texturing process parameters on the inhomogeneous-homogeneous deformations of BMG will be determined; (3) the surface topography as a result of the tool tip vibrations with 2D vibration assistance will be predicted.This proposed research is expected to bring broad impacts to industry. Biocompatible BMGs have been developed as new implant materials. The advantage of BMGs compared to conventionally used titanium is their low elastic moduli which nearly match that of bones, therefore reducing the damage to the bones. Surface texture is generated on the implant to enhance the bone-implant bonding. BMGs with surface texture also have been used as molds for the fabrication of structured micro optics. This research will provide guidance in determining process parameters to improve the texture quality without trial-and-error processes. As a result, a cost-effective surface texturing technique with high geometric accuracy and surface quality will be achieved.

我的长期研究目标是提高对精确制造过程中的力学和材料响应的理解，以提高组件表面质量，包括地形和微观结构特性。在接下来的五年中，我的研究将重点关注具有超声振动辅助的散装金属玻璃（BMG）表面纹理的基本机制。BMGS是具有非晶体结构的金属合金的新类别。 BMG已越来越多地用于各种工业应用中，例如轴承组件。表面纹理是一种产生重复的表面图案的技术，该技术充当润滑剂储层，以使轴承系统的摩擦学性能受益。现有的表面纹理过程（例如化学蚀刻和激光纹理）不适用于BMG，因为它们的环境影响不良和过程引起的微观结构修饰。机械加工能够在保持原始材料阶段的同时实现纹理表面。机械纹理的主要挑战是工具尖端断裂和撞击力造成的表面损伤。为了克服这一障碍，提出了一种使用高馈电铣削具有超声振动辅助（VA）的新纹理技术。 VA修改了工具尖端轨迹，并大量减少芯片负载。假设VA增强了从不均匀模式到均相模式的BMG变形的过渡，从而减少了表面损伤。了解表面纹理中的过程参数如何定量影响纹理几何和表面质量存在知识差距。提出了以下研究计划：（1）将开发具有超声振动特征的新的微观识别技术，以识别本构型BMG在较大应变，高应变速率，温度变化和重复载荷下的行为； （2）将确定纹理过程参数对BMG不均匀变形的影响； （3）将预测具有二维振动辅助的工具尖端振动的结果。这项拟议的研究有望对行业产生广泛的影响。生物相容性的BMG已作为新植入物材料开发。与常规使用的钛相比，BMG的优势是它们的低弹性模量几乎与骨骼相匹配，因此减少了对骨骼的损伤。表面纹理是在植入物上产生的，以增强骨植入术粘结。具有表面纹理的BMG也已用作制造结构化微光学器件的模具。这项研究将为确定过程参数提供指导，以提高纹理质量，而无需反复试验。结果，将达到具有高几何精度和表面质量的经济高效的表面纹理技术。