Structural Change in Ni-Fe-Ga Magnetic Shape Memory Alloys after Severe Plastic Deformation
| Autor: | Felicia Tolea, V. Sampath, Gheorghe Gurau, Carmela Gurau |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
ultrafine-grained materials 02 engineering and technology 01 natural sciences lcsh:Technology Article severe plastic deformation 0103 physical sciences General Materials Science Composite material lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T Ferromagnetic shape memory alloys Shape-memory alloy 021001 nanoscience & nanotechnology Microstructure Ni-Fe-Ga Magnetic shape-memory alloy HSHPT lcsh:TA1-2040 Martensite Diffusionless transformation Vickers hardness test Grain boundary lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering SPD Severe plastic deformation 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials Materials, Vol 12, Iss 12, p 1939 (2019) Volume 12 Issue 12 |
| ISSN: | 1996-1944 |
| Popis: | Severe plastic deformation (SPD) is widely considered to be the most efficient process in obtaining ultrafine-grained bulk materials. The aim of this study is to examine the effects of the SPD process on Ni-Fe-Ga ferromagnetic shape memory alloys (FSMA). High-speed high-pressure torsion (HSHPT) was applied in the as-cast state. The exerted key parameters of deformation are described. Microstructural changes, including morphology that were the result of processing, were investigated by optical and scanning electron microscopy. Energy-dispersive X-ray spectroscopy was used to study the two-phase microstructure of the alloys. The influence of deformation on microstructural features, such as martensitic plates, intragranular &gamma phase precipitates, and grain boundaries&rsquo dependence of the extent of deformation is disclosed by transmission electron microscopy. Moreover, the work brings to light the influence of deformation on the characteristics of martensitic transformation (MT). Vickers hardness measurements were carried out on disks obtained by SPD so as to correlate the hardness with the microstructure. The method represents a feasible alternative to obtain ultrafine-grained bulk Ni-Fe-Ga alloys. |
| Databáze: | OpenAIRE |
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