Amorphization reaction of Ni-Ta powders during mechanical alloying

Pee Yew Lee, J. U Lung Yang, Chung Kwei Lin, Hong Ming Lin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This study examined the amorphization behavior of NixTa100-x alloy powders synthesized by mechanically alloying (MA) mixtures of pure crystalline Ni and Ta powders with a SPEX high energy ball mill. According to the results, after 20 hours of milling, the mechanically alloyed powders were amorphous for the composition range between Ni10Ta90 and Ni80Ta20. A supersaturated nickel solid solution formed for Ni90Ta10, as well. X-ray diffraction analysis reveals two different types of amorphization reactions. Through an intermediate solid solution and by direct formation of amorphous phase. The thermal stability of the amorphous powders was also investigated by differential thermal analysis. As the results demonstrated, the crystallization temperature of amorphous Ni-Ta powders increased with increasing Ta content. In addition, the activation energy of amorphous Ni-Ta powders reached a maximum near the eutectic composition.

Original languageEnglish
Pages (from-to)1429-1435
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume28
Issue number7
Publication statusPublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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