Synthesis of ternary and quaternary Al–based amorphous alloys by mechanical alloying technique
| Autor: | Yun-Kai Lai, 賴昀楷 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 This study examined the amorphization behavior of Al-based alloying powders synthesized by mechanical alloying technique. It investigated the glass forming ability (GFA) by controlling the alloy compositions. The structural evolution of the as-milled powders during mechanical alloying was investigated by X-ray diffractometry(XRD). The thermal stability of the as-milled powders were analysed by the differential scanning calorimeter (DSC) and simultaneous DTA-TGA. The morphology of milled powders observed by scanning electron microscopy (SEM). As the results demonstrated, a single amorphous phase exists in Al50Ti45Ni5, Al50Ti40Ni10, Al60Ti35Ni5, Al50Ti45Cu5, Al50Ti40Cu10 and Al50Ti45Si5 ternary alloying powders. In the quaternary Al-based alloys, Al60Ti35Ni5-XSiX ( X = 1, 2, 3, 4 ), Al60Ti35-XNi5SiX ( X = 1, 3 ), Al60Ti35Ni5-XBX ( X = 1, 2, 3 ) and Al60Ti35Ni5-XCuX ( X = 1, 2, 3 ) alloy systems have also a single amorphous phase. Al60Ti35Ni2Si3 amorphous alloy have a wide supercooled liquid region. ( △T = 103K, Trg = 0.476, γ = 0.378 ) |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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