ERI: Manufacturing USA: Additive Manufacturing of Iron based Shape Memory Alloy

增材制造的进步使功能梯度材料和形状记忆合金系统的加工成为可能，这些系统以前很难用传统方法加工。这项工程研究启动（ERI）资助将支持使用热辅助增材制造制造铁基形状记忆合金的基础研究，这将为材料设计和制造奠定理论基础。该研究成果将使电池、生物医学设备、机器人等对极端温度敏感的新工业应用成为可能。与LIFT制造美国中心的合作将为研究生提供培训机会，促进本科研究，并向不同群体的年轻学生提供服务。这笔拨款将通过促进金属增材制造的实施和促进其一致性来影响制造业，同时培养未来先进制造业的领导者。与镍钛（NiTi）形状记忆合金系统相比，铁基形状记忆合金提供了更高的应变恢复百分比，并实现了对环境温度依赖性较小的新型应变恢复行为。与镍钛合金相比，铁基形状记忆合金的成本明显降低。然而，利用增材制造技术加工铁基形状记忆合金的方法还不是很清楚。本研究旨在了解工艺参数和材料成分对铁基形状记忆合金制备的影响。该项目包括三个研究任务：(1)了解增材制造工艺参数对制备铁基形状记忆合金力学性能的影响；(2)确定转变温度和应变恢复行为，以及它们与材料成分的关系；(3)开发增材制造铁基形状记忆合金的原位热层析成像监测和建模框架，以定义定制的材料性能和响应。该研究将填补设计适用于增材制造的铁基形状记忆合金所需的知识空白，并推进对应变恢复行为的理解。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Advances in additive manufacturing have enabled the processing of functionally graded materials and shape memory alloy systems that were previously difficult to process using conventional methods. This Engineering Research Initiation (ERI) grant will support fundamental research in the fabrication of iron-based shape memory alloy using heat-assisted additive manufacturing, which will lay the theoretical foundation for material design and manufacturing. The research outcome will enable new industrial applications that are sensitive to extreme temperatures, such as batteries, biomedical devices, robotics, and others. Partnership with LIFT Manufacturing USA center will offer training opportunities to graduate students, promote undergraduate research and outreach to diverse groups of younger students. This grant will impact the manufacturing industry by facilitating the implementation of metal additive manufacturing and promoting its consistency, while training future leaders of advanced manufacturing.Compared to well-studied nickel titanium (NiTi) shape memory alloy systems, iron-based shape memory alloys offer a higher strain recovery percentage and enable new strain recovery behavior that is less dependent on the environment temperature. The cost of iron-based shape memory alloy is significantly lower compared to its NiTi counterpart. However, the processing of iron-based shape memory alloy using additive manufacturing is not well understood. This research aims to understand the effect of processing parameters and material composition on fabrication of iron-based shape memory alloys. The project includes three research tasks: (1) understanding the impact of additive manufacturing processing parameters on the mechanical properties of fabricated iron-based shape memory alloy; (2) identifying the transformation temperatures and strain recovery behavior, as well as their relationship to the material composition, (3) developing an in-situ thermal tomography monitoring and modeling framework for additively manufactured iron-based shape memory alloys to define tailored material properties and responses. The research will fill the knowledge gap needed to design iron-based shape memory alloys amenable to additive manufacturing and advance the understanding of strain recovery behaviors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.