Main Page
About Science
Faculty Deanship
Letter of Dean
Overview of Deanship
Vice Deans
Vice Dean
Letter of Vice-dean
Overview of Vice-deanship
Vice Dean for Graduate Studies
Letter of Vice Dean for Graduate Studies
Overview of Vice Dean of Postgraduate Studies
Research and Innovation Unit
Vice Dean for Girls Campus
Faculty Management
Letter of Managing Director-Boys Campus
Letter of Managing Director-Girls Campus
Overview of Management
Educational Affairs
Males Campus
Staff
Females Campus
Contact Us
Research
عربي
English
About
Admission
Academic
Research and Innovations
University Life
E-Services
Search
Faculty of Sciences
Document Details
Document Type
:
Article In Journal
Document Title
:
Kinetic study of non-isothermal crystallization in Fe78Si9B13 metallic glass
Kinetic study of non-isothermal crystallization in Fe78Si9B13 metallic glass
Subject
:
Physics
Document Language
:
English
Abstract
:
This paper reports the differential scanning calorimetric (DSC) studies of metallic glass ribbon Fe78Si9B13 at different heating rates. It is found that Fe78Si9B13 metallic glass exhibits two-stage crystallization on heating. In order to calculate the activation energies for crystallization various thermal models are employed. The average values of the activation energies (Ec) were calculated and found to be 342 ± 10 and 351 ± 8 kJ/mol for the first and second phase, respectively. Kinetic parameters such as Avarmi exponent or reaction order (n), dimensionality of growth (m), and frequency factor (Ko) are also discussed. The reaction orders obtained for the two stages of crystallization were n1 = 4 and n2 = 5, confirming the bulk crystallizations of the samples. The deduced Ko values for the two crystallization peaks are calculated to be 9.8 × 1018 and 4.6 × 1018 s-1. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques are used to identify the crystallized phases and morphology of the annealed samples, respectively. Rietveld X-ray profile fittings are also performed that revealed the obtained phases for the Fe78Si9B13 metallic glass were cubic α-Fe(Si) and tetragonal Fe2B with volume fraction of 44% and 56%, respectively. © 2009 Elsevier B.V.
ISSN
:
0925-8388
Journal Name
:
Journal of Alloys and Compounds
Volume
:
484
Issue Number
:
1
Publishing Year
:
2009 AH
2009 AD
Number Of Pages
:
8
Article Type
:
Article
Added Date
:
Monday, October 12, 2009
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
صالح هديهد سلمان الحنيطي
Al-Heniti
Researcher
Doctorate
salheniti@kau.edu.sa
Back To Researches Page