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Ion-irradiation-assisted tuning of phase transformations and physical properties in single crystalline Fe7Pd3 ferromagnetic shape memory alloy thin films

التفاصيل البيبلوغرافية
العنوان: Ion-irradiation-assisted tuning of phase transformations and physical properties in single crystalline Fe7Pd3 ferromagnetic shape memory alloy thin films
المؤلفون: A Arabi-Hashemi, R Witte, A Lotnyk, R A Brand, A Setzer, P Esquinazi, H Hahn, R S Averback, S G Mayr
المصدر: New Journal of Physics, Vol 17, Iss 5, p 053029 (2015)
بيانات النشر: IOP Publishing, 2015.
سنة النشر: 2015
المجموعة: LCC:Science
LCC:Physics
مصطلحات موضوعية: martensitic transformations, ion irradiation, thermodynamics, shape memory materials, metallic alloys, Science, Physics, QC1-999
الوصف: Control of multi-martensite phase transformations and physical properties constitute greatly unresolved challenges in Fe _7 Pd _3 -based ferromagnetic shape memory alloys. Single crystalline Fe _7 Pd _3 thin films reveal an austenite to martensite phase transformation, continuously ranging from the face-centered cubic (fcc) to the face-centered tetragonal (fct) and body-centered cubic (bcc) phases upon irradiation with 1.8 MeV Kr ^+ ions. Within the present contribution, we explore this scenario within a comprehensive experimental study: employing atomic force microscopy (AFM) and high resolution transmission electron microscopy (HR-TEM), we first clarify the crystallography of the ion-irradiation-induced austenite $\Rightarrow $ martensite and inter-martensite transitions, explore the multi-variant martensite structures with c-a twinning and unravel a very gradual transition between variants at twin boundaries. Accompanying magnetic properties, addressed locally and globally, are characterized by an increasing saturation magnetization from fcc to bcc, while coercivity and remanence are demonstrated to be governed by magnetocrystalline anisotropy and ion-irradiation-induced defect density, respectively. Based on reversibility of ion-irradiation-induced materials changes due to annealing treatment and a conversion electron Mößbauer spectroscopy (CEMS) study to address changes in order, a quantitative defect-based physical picture of ion-irradiation-induced austenite ⇔ martensite transformation in Fe _7 Pd _3 is developed. The presented concepts thus pave the way for ion-irradiation-assisted optimization strategies for tailored functional alloys.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1367-2630
Relation: https://doaj.org/toc/1367-2630
DOI: 10.1088/1367-2630/17/5/053029
URL الوصول: https://doaj.org/article/30f7fbda1fc641298046b1f5e3da35a3
رقم الأكسشن: edsdoj.30f7fbda1fc641298046b1f5e3da35a3
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:13672630
DOI:10.1088/1367-2630/17/5/053029