Surface Modification of Bulk-Metallic Glasses by a Laser-Peening Process

本研究的主要目的是：（i）确定激光喷丸大块金属玻璃（BMG）的关键工艺和变量;（ii）优化激光喷丸工艺;（iii）表征处理后表面的残余应力、结构和力学性能;（iv）建立激光喷丸与BMG宏观力学性能之间的关系;（iv）确定激光喷丸强化的最佳工艺参数。（v）模拟了激光喷丸过程与非晶合金之间的相互作用;（vi）阐明了激光喷丸改性非晶合金的机理。该研究计划将提高激光喷丸对表面层和大块BMG样品的结构和性能的影响的理解。目前对非晶合金激光喷丸强化过程的研究将丰富先进材料的研究和教学。在专业会议上的演讲和在学术期刊上的出版物将产生广泛的国内和国际影响。教育、人力资源开发和外联活动将是该方案的组成部分。该计划的研究生将发展先进加工和材料的综合知识，并学习如何规划和进行科学研究。该项目的成果将通过科学界和公众可以利用的渠道传播，重点是初中和高中学生和教师以及妇女和少数民族学生和教师。这些努力不仅将提高公众对先进激光加工和大块金属玻璃材料及其科学重要性的认识，还将激发学生对科学、工程和技术领域的兴趣。

The main objectives of the proposed research are to (i) identify the key processes and variables for laser peening of bulk-metallic glasses (BMGs); (ii) optimize laser-peening processes; (iii) characterize residual stresses, structures, and mechanical properties of the treated surfaces; (iv) establish relationships between the laser peening and macroscopic-mechanical properties of BMGs; (v) model the interactions between the laser-peening process and BMGs; and (vi) elucidate the mechanisms of the laser-peening modification on BMGs. The research Program will improve the understanding of the effects of laser peening on structures and properties of surface layers and bulk BMG samples. The current research on the laser-peening processes of BMGs will enrich the research and teaching efforts in advanced materials. The presentations at professional conferences and the publications in academic journals will achieve the wide national and international impact. The education, human-resource development, and outreach activities will be the integral part of this Program. The graduate student in the Program will develop a comprehensive knowledge of advanced processing and materials, and learn how to plan and conduct scientific research. The results of the Project will be disseminated through avenues accessible to the scientific community and to the general public with an emphasis on middle- and high-school students and teachers, as well as women and minority students and teachers. The efforts will not only increase the public awareness of the advanced laser processing and bulk-metallic-glass materials, and their scientific importance, but also stimulate the interests of the students in pursuing science, engineering, and technology fields of study.