CAREER: Hard and Tough Boron Rich Ceramic Laminates Designed to Contain Thermal Residual Stresses

非技术描述：这个职业计划描述了一个综合研究和教育项目，旨在开发硬质和韧性碳化硼和铝镁硼化物基层压板，在不同的层中控制压应力和拉应力。这项研究为富硼多层陶瓷复合材料的加工、残余应力和力学行为之间的相互关系提供了基础知识和理解。该项目将导致耐磨、耐损伤陶瓷的发展，其机械性能远远超过目前可用的非氧化物陶瓷。建议的项目为机械、材料和航空航天工程专业的学生积极参与基于项目的学习提供了理想的基础。综合研究和教育活动包括扩展到不同的初中生和高中生群体，以及为本科生提供研究机会和课程增强。研究生参与研究，在技术会议上发表演讲，并指导本科生和高中生研究人员。通过高中外展和本科研究部分，特别努力吸引代表性不足的学生投身材料科学和工程领域。此外，通过该项目与一个新的国际研究人员网络的合作，学生将受益于全球研究机会。最终，新的可靠和坚固的系统和设备的开发将带来社会效益。技术细节：具有坚固界面的层压板提供高断裂韧性、更高的耐磨性和损坏容限。因此，这些复合材料表现出更高的可靠性和耐用性。层合板力学性能的提高是通过在不同层间控制残余应力的设计实现的。所提出的模拟-实验程序旨在明确地证明，可控残余应力的概念可用于制造高性能陶瓷层合板。设计了具有可控残余应力的富硼多层陶瓷样品，并进一步采用轧制和热压/热等静压的方法进行了制备。此外，层压板的制造将采用流延和放电等离子烧结。研究结果清楚地确定了控制层合板残余应力的微观结构参数。测试力学性能，如强度、硬度、耐磨性和断裂韧性，以确认层压板机械性能的提高。这位PI参加了她所在大学的布里奇斯暑期项目，以吸引聪明有才华的学生进入工程学。研究生和本科生有一个独特的机会成为尖端的国际材料开发研究团队的一部分，并发表他们的结果。

NON-TECHNICAL DESCRIPTION: This CAREER program describes an integrated research and educational project to develop hard and tough boron carbide and aluminium magnesium boride based laminates with controlled compressive and tensile stresses in separate layers. The research produces fundamental knowledge and understanding of the interrelationships between processing, residual stresses, and mechanical behavior of boron rich multilayered ceramic composites. This project will lead to the development of wear resistant, damage-tolerant ceramics with enhanced mechanical properties far exceeding those of currently available non-oxide ceramics. The proposed project provides an ideal basis for mechanical, Materials and aerospace engineering students to actively participate in project-based learning. Integrated research and educational activities include outreach to a diverse group of middle and high school students and research opportunities and course enhancements for undergraduate students. Graduate students are involved in research, presentations at technical meetings, and mentor undergraduate and high school student researchers. Special efforts are made to attract underrepresented students to careers in materials science and engineering through the high school outreach and undergraduate research components. In addition, students will benefit from global research opportunities through the project's collaboration with a new network of international researchers. Ultimately, societal benefits will come with the development of novel reliable and robust systems and devices.TECHNICAL DETAILS: Laminates with strong interfaces provide high fracture toughness, increased wear resistance and damage tolerance. As a result, these composites exhibit improved reliability and durability. The enhancement of the mechanical performance of laminates is obtained through design of controlled residual stresses in separate layers. The proposed modeling-experimental program is designed to demonstrate unequivocally that the concept of controlled residual stresses can be employed to produce high performance ceramic laminates. Samples of boron rich multilayered ceramics with controlled residual stresses are designed and further manufactured by rolling and hot pressing/hot isostatic pressing. Additionally, tape casting and spark plasma sintering are to be used for the laminate manufacturing. The research results in a clear identification of the microstructural parameters that control residual stresses in laminates. Mechanical properties such as strength, hardness, wear resistance, and fracture toughness are to be measured to confirm the increase in the mechanical performance of the laminates. The PI takes part in a Bridges summer program at her university to attract bright and talented students to engineering. Graduate and undergraduate students have a unique opportunity to be a part of a cutting-edge, international materials development research team and to publish their results.