arXiv: Applied Physics最新文献_第10页

High-Temperature Oxidation Kinetics of Additively Manufactured NiTiHf 添加剂制备NiTiHf的高温氧化动力学

arXiv: Applied Physics Pub Date : 2020-06-19 DOI: 10.1115/MSEC2020-8449

Hediyeh Dabbaghi, M. Nematollahi, K. S. Baghbaderani, Parisa Bayatimalayeri, M. Elahinia

{"title":"High-Temperature Oxidation Kinetics of Additively Manufactured NiTiHf","authors":"Hediyeh Dabbaghi, M. Nematollahi, K. S. Baghbaderani, Parisa Bayatimalayeri, M. Elahinia","doi":"10.1115/MSEC2020-8449","DOIUrl":"https://doi.org/10.1115/MSEC2020-8449","url":null,"abstract":"NiTi-based high-temperature shape memory alloys (HTSMAs) such as NiTiHf have been utilized in a broad range of applications due to their high strength and work output, as well as, their ability to increase the transformation temperatures (TTs). Recently, additive manufacturing techniques (AM) have been widely used to fabricate complex shape memory alloy components without any major modifications or tooling and has paved the way to tailor the manufacturing and fabrications of microstructure and critical properties of their final parts. NiTi alloys properties such as transformation temperatures can be significantly altered due to oxidation, which can occur during the manufacturing process or post-processing. In this work, the oxidation behavior of Ni-rich NiTi20Hf shape memory alloys, which was fabricated by the selective laser melting (SLM) method, is evaluated. Thermogravimetric analysis (TGA) is used to assess the kinetic behavior of the oxidation at different temperature ranges of 500, 700, and 900 C for 20 hours in the air. After oxidation, to evaluate the microstructure and chemical composition X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) was conducted. The isothermal oxidation kinetics of conventional NiTi20Hf alloys were studied, and the results were compared to AM samples. Results show a two-stage oxidation rate at which oxidation increased with the high rate at the initial stage. As the oxidation time increased, the oxidation rate gradually decreased. The oxidation behavior of NiTiHf alloys initially obeyed logarithmic rate law and then followed by parabolic rate law. SEM results showed the formation of a multi-layered oxide scale, including TiO2, NiTiO3, and Hf oxide.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":"223 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85937469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Double-absorber thin-film solar cell with 34% efficiency 具有34%效率的双吸收薄膜太阳能电池

arXiv: Applied Physics Pub Date : 2020-06-11 DOI: 10.1063/5.0017916

Faiz Ahmad, A. Lakhtakia, P. Monk

引用次数: 7

Comparison of different methods of nitrogen-vacancy layer formation in diamond for wide-field quantum microscopy 宽视场量子显微镜下金刚石中氮空位层不同形成方法的比较

arXiv: Applied Physics Pub Date : 2020-06-09 DOI: 10.1103/PHYSREVMATERIALS.4.104605

A. Healey, Alastair Stacey, Alastair Stacey, Brett C. Johnson, D. A. Broadway, T. Teraji, David A. Simpson, J. Tetienne, L. Hollenberg

{"title":"Comparison of different methods of nitrogen-vacancy layer formation in diamond for wide-field quantum microscopy","authors":"A. Healey, Alastair Stacey, Alastair Stacey, Brett C. Johnson, D. A. Broadway, T. Teraji, David A. Simpson, J. Tetienne, L. Hollenberg","doi":"10.1103/PHYSREVMATERIALS.4.104605","DOIUrl":"https://doi.org/10.1103/PHYSREVMATERIALS.4.104605","url":null,"abstract":"Thin layers of near-surface nitrogen-vacancy (NV) defects in diamond substrates are the workhorse of NV-based widefield magnetic microscopy, which has applications in physics, geology and biology. Several methods exist to create such NV layers, which generally involve incorporating nitrogen atoms (N) and vacancies (V) into the diamond through growth and/or irradiation. While there have been detailed studies of individual methods, a direct side-by-side experimental comparison of the resulting magnetic sensitivities is still missing. Here we characterise, at room and cryogenic temperatures, $approx100$ nm thick NV layers fabricated via three different methods: 1) low-energy carbon irradiation of N-rich high-pressure high-temperature (HPHT) diamond, 2) carbon irradiation of $delta$-doped chemical vapour deposition (CVD) diamond, 3) low-energy N$^+$ or CN$^-$ implantation into N-free CVD diamond. Despite significant variability within each method, we find that the best HPHT samples yield similar magnetic sensitivities (within a factor 2 on average) to our $delta$-doped samples, of $<2$~$mu$T Hz$^{-1/2}$ for DC magnetic fields and $<100$~nT Hz$^{-1/2}$ for AC fields (for a $400$~nm~$times~400$~nm pixel), while the N$^+$ and CN$^-$ implanted samples exhibit an inferior sensitivity by a factor 2-5, at both room and low temperature. We also examine the crystal lattice strain caused by the respective methods and discuss the implications this has for widefield NV imaging. The pros and cons of each method, and potential future improvements, are discussed. This study highlights that low-energy irradiation of HPHT diamond, despite its relative simplicity and low cost, is a competitive method to create thin NV layers for widefield magnetic imaging.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85128204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

On the quantitative optical properties of Au nanoparticles embedded in biological tissue phantoms 金纳米粒子嵌入生物组织幻影的定量光学性质研究

arXiv: Applied Physics Pub Date : 2020-06-08 DOI: 10.1016/J.OPTMAT.2021.110924

Jose Araujo, A. Monte, R. Lora-Serrano, W. Iwamoto, A. Antunes, O. Brener, M. Foschini

引用次数: 2

All-Linear Multistate Magnetic Switching Induced by Electrical Current 电流感应的全线性多态磁开关

arXiv: Applied Physics Pub Date : 2020-06-05 DOI: 10.1103/PhysRevApplied.15.054013

Meiyin Yang, Yanru Li, Jun Luo, Yongcheng Deng, N. Zhang, Xueying Zhang, Shaoxin Li, Yan Cui, Peiyue Yu, Tengzhi Yang, Y. Sheng, Sumei Wang, Jing Xu, Chao Zhao, Kaiyou Wang

引用次数: 1

High quality three-dimensional aluminum microwave cavities 高品质的三维铝微波腔

arXiv: Applied Physics Pub Date : 2020-06-03 DOI: 10.1063/5.0016463

M. Kudra, J. Biznárová, F. Roudsari, Jonathan Burnett, D. Niepce, Simone Gasparinetti, Björn Wickman, P. Delsing

引用次数: 27

Transient work function gating: A new photoemission regime 瞬态功函数门控:一种新的光电发射机制

arXiv: Applied Physics Pub Date : 2020-06-02 DOI: 10.1063/5.0011737

S. Carbajo

引用次数: 2

A high-entropy alloy as very low melting point solder for advanced electronic packaging 高熵合金作为极低熔点焊料用于先进的电子封装

arXiv: Applied Physics Pub Date : 2020-06-02 DOI: 10.1016/j.mtadv.2020.100101

Y. Liu, L. Pu, Y. Yang, Q. He, Z. Zhou, C. Tan, X. Zhao, Q. Zhang, K. Tu