Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region
碩士 === 國立海洋大學 === 材料工程研究所 === 88 === This study examined the amorphization behavior of Ti94-x-yCuxNiySi4B2 alloy powders synthesized by mechanical alloying technique. According to the results, after 5~7 hours of milling, the mechanically alloyed powders were amorphous at compositions with (x+y) equa...
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ndltd-TW-088NTOU01590042016-01-29T04:14:29Z http://ndltd.ncl.edu.tw/handle/38384370288494223728 Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region 機械合金法合成具寬廣過冷液態區鈦基非晶質合金粉末之研究 Nan-Fong Hsu 許楠鋒 碩士 國立海洋大學 材料工程研究所 88 This study examined the amorphization behavior of Ti94-x-yCuxNiySi4B2 alloy powders synthesized by mechanical alloying technique. According to the results, after 5~7 hours of milling, the mechanically alloyed powders were amorphous at compositions with (x+y) equal to 20~40%. For the compositions with (x+y) larger than 45% or smaller than 10%, the structure of ball-milled powders is either a partial amorphous single phase or coexistent partial amorphous and crystalline phases. The thermal stability of the amorphous powders was also investigated by differential thermal analysis. As the results demonstrated, several amorphous powders were found to exhibit a wide supercooled liquid region before crystallization. The temperature interval of the supercooled liquid region defined by the difference between Tg and Tx, i.e.ΔT=Tx-Tg), is 82K for Ti74Ni20Si4B2, 94K for Ti64Ni30Si4B2, 58K for Ti64Cu10Ni10Si4B2, 116K for Ti54Cu10Ni30Si4B2, 131K for Ti54Cu20Ni20Si4B2,and 94K for Ti54Cu30Ni10Si4B2. The glass transition process in the Ti64Ni30Si4B2 is found to be a kinetically modified thermodynamics phase transformation process. P. Y. Lee 李丕耀 2000 學位論文 ; thesis 99 zh-TW |
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碩士 === 國立海洋大學 === 材料工程研究所 === 88 === This study examined the amorphization behavior of Ti94-x-yCuxNiySi4B2 alloy powders synthesized by mechanical alloying technique. According to the results, after 5~7 hours of milling, the mechanically alloyed powders were amorphous at compositions with (x+y) equal to 20~40%. For the compositions with (x+y) larger than 45% or smaller than 10%, the structure of ball-milled powders is either a partial amorphous single phase or coexistent partial amorphous and crystalline phases. The thermal stability of the amorphous powders was also investigated by differential thermal analysis. As the results demonstrated, several amorphous powders were found to exhibit a wide supercooled liquid region before crystallization. The temperature interval of the supercooled liquid region defined by the difference between Tg and Tx, i.e.ΔT=Tx-Tg), is 82K for Ti74Ni20Si4B2, 94K for Ti64Ni30Si4B2, 58K for Ti64Cu10Ni10Si4B2, 116K for Ti54Cu10Ni30Si4B2, 131K for Ti54Cu20Ni20Si4B2,and 94K for Ti54Cu30Ni10Si4B2. The glass transition process in the Ti64Ni30Si4B2 is found to be a kinetically modified thermodynamics phase transformation process.
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author2 |
P. Y. Lee |
author_facet |
P. Y. Lee Nan-Fong Hsu 許楠鋒 |
author |
Nan-Fong Hsu 許楠鋒 |
spellingShingle |
Nan-Fong Hsu 許楠鋒 Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region |
author_sort |
Nan-Fong Hsu |
title |
Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region |
title_short |
Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region |
title_full |
Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region |
title_fullStr |
Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region |
title_full_unstemmed |
Mechanical Alloyed Ti-based Amorphous Alloys with Significant Supercooled Liquid Region |
title_sort |
mechanical alloyed ti-based amorphous alloys with significant supercooled liquid region |
publishDate |
2000 |
url |
http://ndltd.ncl.edu.tw/handle/38384370288494223728 |
work_keys_str_mv |
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