Show/Hide Menu
Hide/Show Apps
anonymousUser
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Frequently Asked Questions
Frequently Asked Questions
Browse
Browse
By Issue Date
By Issue Date
Authors
Authors
Titles
Titles
Subjects
Subjects
Communities & Collections
Communities & Collections
Synthesis and structural characterization of Ni-B nanoalloys
Download
index.pdf
Date
2015
Author
Mut, Lütfiye Seda
Metadata
Show full item record
Item Usage Stats
2
views
0
downloads
Within the scope of this study, it is aimed to produce and to realize the structural characterization of Nickel Boron nanocrystalline/amorphous, alloy/intermetallic phase powders. Mechanical alloying by high energy ball milling was determined as production method. X-ray diffraction (XRD) for phase analysis, Scanning Electron Microscopy (SEM) for microstructure and morphological analysis, Vibrating Sample Magnetometer (VSM) for change in magnetic properties and Differential Scanning Calorimetry (DSC) for thermal analysis were determined as methods for characterization of produced powders. Milling operation has been carried out with two different compositions as Ni80B20 and Ni60B40, prepared from elemental Nickel and Boron powders. For both compositions, after 1, 5, 10, 20, 40, 60 and 80 hours of milling, samples have been taken out and analyses have been carried out. According to the structural analyses, there are no remarkable additional peaks belonging to any intermetallic compounds until 40 hours of milling. For Ni80B20 composition, Ni3B and Ni2B peaks after 40 hours of milling and for Ni60B40, Ni3B peak after 60 hours of milling were observed notably and with the increase in milling time intensities of these peaks increased. Besides, XRD and SEM analyses have shown that particle size and/or crystallite size decreased with increasing milling time. Additionally, along with peak broadening in XRD curves, DSC analyses have pointed out the formation of amorphous structure. As for, changes in magnetic properties it was shown that with increase in milling time, saturation magnetization shows a general decrease and hysteresis increases.
Subject Keywords
Mechanical alloying.
,
Nanocrystals.
,
Nanoparticles.
,
Ball mills.
URI
http://etd.lib.metu.edu.tr/upload/12618881/index.pdf
https://hdl.handle.net/11511/24791
Collections
Graduate School of Natural and Applied Sciences, Thesis