Document Details

Document Type : Thesis 
Document Title :
SYNTHESES AND APPLICATIONS OF MULTICOMPONENT BULK GLASSY ALLOYS WITH FUNCTIONAL PROPERTIES
تحضير سبائك المعادن الزجاجية متعددة العناصر ذات الخصائص الوظيفية ودراسة تطبيقاتها المختلفة
 
Subject : Faculty of Science 
Document Language : Arabic 
Abstract : Metallic glasses has an amorphous structure which means these materials do not have the crystalline defect. Therefore, they have high strength and low stiffness by comparison with other crystalline alloys. These features give metallic glasses the ability to store elastic strain energy and release it. Metallic glasses have a wide range potential applications for electronics, engineering, medicine, sports …etc. In this thesis, structure, the thermal behavior, non-isothermal crystallization kinetics and mechanical properties of metallic glasses have been investigated. The comparison between three types of metallic glasses namely Zr60Al10 Ni25Pd5, Zr60 Al5 Ni30 Pd5 and Zr55All0Ni30Pd5 is introduced. It was found that Zr55All0Ni30Pd5 metallic glass exhibited two-stage of crystallization on heating by comparison with Zr60Al10 Ni25Pd5 and Zr60 Al5 Ni30Pd5 metallic glasses which showed one-stage crystallization on heating. Furthermore, the apparent activation energies for crystallization for these metallic glasses were evaluated using different non-isothermal methods namely, Augis and Bennet, Kissinger and Mahadavan methods. Also, the local activation energies of non-isothermal crystallization were calculated at different crystallized volume fractions according to Kissinger–Akahira–Sunose (KAS), Ozawa–Flynn–Wall (OFW) and Tang models based on DSC data. It was found that these energies can be controlled by the amount of elements on the alloy and the heating rate. The mechanical properties of these alloys have also been studied, and it was also noticed that these properties differ according to the percentage of elements that make up these alloys. 
Supervisor : Prof. Dr. El-Sayed Ibrahim Shalaan 
Thesis Type : Doctorate Thesis 
Publishing Year : 1442 AH
2020 AD 
Co-Supervisor : Prof. Dr. Saleh Hedihed Al-Heniti 
Added Date : Saturday, February 6, 2021 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
سميره عبد الله الهاشميAl-Hashmi, Sameera AbdullahResearcherDoctorate 

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