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

这项研究的主要目标是：(I)确定块体金属玻璃激光喷丸的关键工艺和变量；(Ii)优化激光喷丸工艺；(Iii)表征处理后表面的残余应力、结构和机械性能；(Iv)建立激光喷丸与块体金属玻璃宏观力学性能之间的关系；(V)模拟激光喷丸过程与块体金属玻璃之间的相互作用；以及(Vi)阐明激光喷丸对块体金属玻璃的改性机理。该研究计划将提高对激光喷丸对表层和块状BMG样品的结构和性能影响的理解。目前对BMG激光喷丸工艺的研究将丰富先进材料的研究和教学工作。在专业会议上的演讲和在学术期刊上的发表将在国内和国际上产生广泛的影响。教育、人力资源开发和外展活动将是该计划不可或缺的一部分。该计划的研究生将发展先进的加工和材料的综合知识，并学习如何计划和进行科学研究。该项目的成果将通过科学界和公众可利用的途径传播，重点是初中生和高中生和教师以及妇女和少数族裔学生和教师。这些努力不仅将提高公众对先进激光加工和块体金属玻璃材料及其科学重要性的认识，而且还将激发学生对科学、工程和技术领域的学习兴趣。

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.