Preparation and properties of Ti50Cu28 Ni15Sn7 bulk metallic glass by vacuum hot pressing

H. M. Lin, C. K. Lin, R. R. Jeng, H. Y. Bor, P. Y. Lee

Research output: Contribution to journalArticle

Abstract

Amorphous Ti50Cu28Ni15Sn7 alloy powders were synthesized by a mechanical alloying (MA) technique. Differential scanning calorimetry (DSC) results showed that, after 7 hours of exposure to the milling process, amorphous Ti50 Cu28Ni15Sn7 alloy powders exhibit a wide supercooled liquid region of 61 K. Consolidation of amorphous powders were performed at a temperature slightly higher than the glass transition temperature under a pressure of ∼1.2 GPa, and bulk metallic glass (BMG) discs can be prepared successfully. However, we noticed partial crystallization during the hot pressing process and were not able to achieve full densification of BMG. The Vickers microhardness of Ti50Cu28Ni15Sn7 BMG was 634 kg/mm2, and the trace of the indentation revealed that pre-existing particle boundaries or interfaces between nanocrystals and amorphous matrix may serve as the crack initiation sites. Thus, typical brittle failure of Ti50Cu28Ni15 Sn7 BMG was observed and resulted in relatively low fracture stress compared to that estimated by the microhardness.

Original languageEnglish
Pages (from-to)1857-1861
Number of pages5
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume39
Issue number8
DOIs
Publication statusPublished - Aug 2008
Externally publishedYes

Fingerprint

hot pressing
Metallic glass
Hot pressing
metallic glasses
Vacuum
Powders
vacuum
preparation
Microhardness
microhardness
crack initiation
consolidation
Mechanical alloying
Amorphous alloys
densification
Crystallization
indentation
Densification
Indentation
Crack initiation

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Preparation and properties of Ti50Cu28 Ni15Sn7 bulk metallic glass by vacuum hot pressing. / Lin, H. M.; Lin, C. K.; Jeng, R. R.; Bor, H. Y.; Lee, P. Y.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 39, No. 8, 08.2008, p. 1857-1861.

Research output: Contribution to journalArticle

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