Electrical Discharge Machining of Biomedical Nitinol Alloys and the Resulting Fundamental Relationship of Microstructure-Property-Function

生物医用镍钛诺合金的放电加工及其微观结构-性能-功能的基本关系

基本信息

批准号：
1234696
负责人：
Yuebin Guo
金额：
$ 37万
依托单位：
University of Alabama Tuscaloosa
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-09-01 至 2016-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1234696&HistoricalAwards=false
关键词：
Electrical Discharge Machining Biomedical Nitinol

项目摘要

The research objective of this proposal is to understand the basic relationship between machining conditions, white layer (that is, recast layer), and fatigue and corrosion by electrical discharge machining of biomedical Nitinol alloys by bringing together complementary international research and education expertise. It will test the hypothesis that electrical discharge machining using minimum discharge energy is a very competitive process compared to mechanical machining to economically fabricate delicate burr-free Nitinol microstructures with high aspect ratio and excellent surface finish. The research approaches are to: (1) explore the process capability in electrical discharge machining of biomedical Nitinol alloys to establish a basic relationship between processing conditions and surface integrity; (2) determine whether the white layer is metastable nano-quasicrystal using transmission electron microscopy and x-ray diffraction; (3) clarify the fundamental role of process-induced surface integrity, white layer in particular, on fatigue and corrosion performance; and (4) reveal material erosion mechanism and microstructural evolution in electrical discharging via a multiphysics process simulation approach with the capability of material ablation.The research results will have a wide spectrum of impacts on machining of a broad range of other difficult-to-cut materials including titanium, Inconel, stainless steel, and hardened alloys. The sound sustainable practices in electrical discharge machining of metallic biomaterials can bring business value to biomedical device industry as well as tool, gas turbine, chemical and oil industries. The project will establish a synergistic education network between the University of Alabama and Aachen University to train the next cadre of ?whole-brain? students in the global context. The collaborative network will also provide an express way for fast technology transfer from fundamental research to industrial practices.

本提案的研究目标是通过汇集互补的国际研究和教育专业知识，了解生物医用镍钛合金放电加工的加工条件、白层（即重铸层）以及疲劳和腐蚀之间的基本关系。它将检验这样一个假设：与机械加工相比，使用最小放电能量的放电加工是一种非常有竞争力的工艺，可以经济地制造具有高深宽比和优异表面光洁度的精致无毛刺镍钛诺微结构。研究思路是：（1）探索生物医用镍钛合金放电加工的工艺能力，建立加工条件与表面完整性之间的基本关系； (2)利用透射电镜和X射线衍射判断白色层是否为亚稳态纳米准晶； (3) 阐明过程引起的表面完整性（特别是白层）对疲劳和腐蚀性能的根本作用；（4）通过具有材料烧蚀能力的多物理场过程模拟方法，揭示放电过程中的材料腐蚀机制和微观结构演变。研究成果将对其他各种难切削材料的加工产生广泛的影响材料包括钛、铬镍铁合金、不锈钢和硬化合金。金属生物材料放电加工的良好可持续实践可以为生物医疗器械行业以及工具、燃气轮机、化工和石油行业带来商业价值。该项目将在阿拉巴马大学和亚琛大学之间建立协同教育网络，培养下一代“全脑”骨干人才。全球背景下的学生。该协作网络还将为从基础研究到工业实践的快速技术转移提供快速途径。