Preparation and thermal stability of Zr-Ti-Al-Ni-Cu amorphous powders by mechanical alloying technique

C. K. Lin, S. W. Liu, P. Y. Lee

研究成果: 雜誌貢獻文章同行評審

26 引文 斯高帕斯(Scopus)

摘要

This study examined the amorphization feasibility of Zr70-x-yTixAlyNi10Cu20 alloy powders by the mechanical alloying (MA) technique. According to the results, after 5 to 7 hours of milling, the mechanically alloyed powders were amorphous basically in the ranges of 0 to 12.5 at. pct Ti and 2.5 to 17.5 at. pct Al. These ranges are larger than those of bulk amorphous alloys prepared by a squeeze mold casting technique. Most of the amorphous mechanically alloyed powders exhibited a wide supercooled liquid region of more than 60 K before crystallization. The glass-transition and crystallization temperatures of mechanically alloyed samples were different from those prepared by squeeze casting. It is suspected that different thermal properties arise from the introduction of impurities during the MA process. The amorphization behavior of Zr50Ti7.5Al12.5Ni10Cu20 was examined in detail. The X-ray diffraction and extended X-ray absorption fine structure (EXAFS) results show the fully amorphous powders formed after 5 hours of milling. A kinetically modified thermodynamic phase transformation process was observed for the glass-transition behavior in the Zr50Ti7.5Al12.5Ni10 Cu20 amorphous powder.
原文英語
頁(從 - 到)1777-1786
頁數10
期刊Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
32
發行號7
出版狀態已發佈 - 七月 2001
對外發佈

ASJC Scopus subject areas

  • 材料科學(全部)
  • 金屬和合金

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