Collaborative Research: Fatigue Crack Formation and Growth in the Presence of Reversible Martensitic Transformation in High Temperature Shape Memory Alloys

合作研究：高温形状记忆合金中存在可逆马氏体相变时疲劳裂纹的形成和扩展

• 批准号: 1917367
• 负责人: Ibrahim Karaman
• 金额: $ 24.38万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1917367&HistoricalAwards=false
• 关键词: Collaborative; Research; Fatigue; Crack; Formation

Newly discovered high-temperature shape memory alloys can recover large deformations at elevated temperatures through a reversible transformation of their crystal structure. This has warranted significant interest in their use as solid-state actuators in aeronautics, automotive, and energy-conversion applications. These actuators could potentially provide ultra-high energy density actuation and would allow multifunctional use, resulting in lower cost and maintenance due to simplified device designs. The aim of this research project is to accelerate the development cycle of these materials by elucidating the life-limiting fatigue mechanisms. The knowledge of fatigue progression in these alloys will facilitate the wider acceptance of materials exhibiting reversible martensitic transformation in engineering applications. Furthermore, through the synergistic combination of experiments and modeling and its multidisciplinary nature, this research will train the next generation of experts in multifunctional, phase transforming materials. It will also support the involvement of underrepresented groups in research and professional experiences via partnership with the Boeing Company, NASA, and international collaborators.This research will involve multiscale thermomechanical testing and microstructural characterization as well as sophisticated modeling to identify defect kinetics as a function of microstructural attributes in the presence of reversible martensitic transformation and associated irreversible processes. While recently discovered Nickel-Titanium-Hafnium (NiTiHf) alloys will be used as a model material system, many of the experimental findings and models are expected to be transferable to other phase transforming materials as well. The experimental work will rely on in-situ thermomechanical testing in scanning electron microscope and ex-situ transmission electron microscopy, as well as digital image correlation and synchrotron X-ray tomography to monitor defect formation/growth and to characterize microstructure, deformation structure, and fracture surfaces. The modeling work will be based on a phase field approach to fatigue crack formation and growth. This approach will provide an advantage over current methods that rely on self-similar crack growth assumptions of conventional fracture mechanics, which break down due to the variability of the underlying microstructure and their complex influence on the mechanical fields close to the crack tip.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.

新发现的高温形状记忆合金可以通过其晶体结构的可逆转变在高温下恢复大变形。这保证了它们在航空、汽车和能量转换应用中作为固态致动器的显著兴趣。这些致动器可能提供超高能量密度的致动，并允许多功能使用，由于简化了设备设计，从而降低了成本和维护成本。本研究的目的是通过阐明这些材料的极限疲劳机制来加快其开发周期。了解这些合金的疲劳过程将有助于在工程应用中更广泛地接受表现可逆马氏体相变的材料。此外，通过实验和建模的协同结合及其多学科性质，本研究将培养多功能相变材料的下一代专家。它还将通过与波音公司、美国宇航局和国际合作者的合作，支持代表性不足的群体参与研究和专业经验。这项研究将涉及多尺度的热力学测试和微观结构表征，以及复杂的建模，以确定缺陷动力学作为可逆性马氏体相变和相关不可逆过程中微观结构属性的函数。虽然最近发现的镍钛铪（NiTiHf）合金将被用作模型材料系统，但许多实验发现和模型也有望转移到其他相变材料中。实验工作将依靠扫描电子显微镜和非原位透射电子显微镜的原位热力学测试，以及数字图像相关和同步加速器x射线断层扫描来监测缺陷的形成/生长，并表征微观结构，变形结构和断裂面。建模工作将基于疲劳裂纹形成和扩展的相场方法。这种方法将比目前依赖于传统断裂力学的自相似裂纹扩展假设的方法具有优势，传统断裂力学的失效是由于底层微观结构的可变性及其对裂纹尖端附近力学场的复杂影响。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。

项目成果

Strain glass state in Ni-rich Ni-Ti-Zr shape memory alloys

• DOI: 10.1016/j.actamat.2021.117232
• 发表时间: 2021-10
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: S. Xu;J. Pons;R. Santamarta;I. Karaman;O. Benafan;R. Noebe

Actuation-Induced stable crack growth in near-equiatomic nickel-titanium shape memory alloys: Experimental and numerical analysis

近等原子镍钛形状记忆合金中驱动诱导的稳定裂纹扩展：实验和数值分析

• DOI: 10.1016/j.ijsolstr.2020.09.032
• 发表时间: 2021
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: Jape, S.;Young, B.;Haghgouyan, B.;Hayrettin, C.;Baxevanis, T.;Lagoudas, D.C.;Karaman, I.
• 通讯作者: Karaman, I.

Compositional effects on strain-controlled actuation fatigue of NiTiHf high temperature shape memory alloys

NiTiHf高温形状记忆合金应变控制驱动疲劳的成分效应

• DOI: 10.1016/j.scriptamat.2023.115904
• 发表时间: 2024
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Demblon, A.;Mabe, J.H.;Karaman, I.
• 通讯作者: Karaman, I.

Effect of Temperature on the Fracture Toughness of a NiTiHf High Temperature Shape Memory Alloy

• DOI: 10.1007/s40830-019-00245-2
• 发表时间: 2019-12
• 期刊: Shape Memory and Superelasticity
• 影响因子: 2.2
• 作者: B. Young;B. Haghgouyan;D. Lagoudas;I. Karaman

Fracture resistance of shape memory alloys under thermomechanical loading

形状记忆合金在热机械载荷下的抗断裂性能

• DOI: 10.1016/j.engfracmech.2021.108059
• 发表时间: 2021
• 期刊: Engineering fracture mechanics
• 影响因子: 5.4
• 作者: Makkar, J.;Young, B.;Karaman, I.;Baxevanis, T.
• 通讯作者: Baxevanis, T.