Effect of cast process and microalloying on the fracture toughness of Zr-based bulk amorphous alloys

Y. S. Chang, K. T. Hsu, J. B. Li, P. H. Tsai, J. S.C. Jang, J. C. Huang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In order to clarify the effects of tilt- or suction-cast processing and microalloying of minor Si on the three-point bending fracture toughness of the Zr-based bulk metallic glasses (BMGs), the tilt-cast and suction-cast Zr53-based and Zr48-based BMGs with and without Si were studied. The results revealed that the tilt-cast specimens present much better fracture toughness than the suction-cast counterparts as a result of their lower degrees of residual porosity. In addition, the microalloying of Si to 0.75 at.% in these BMGs would impose negative effects on their fracture toughness. The highest fracture toughness of 120 MPa m was achieved for the tilt-cast Zr53Cu 30Ni9Al8. Moreover, the morphology of fracture surface, the calculated fracture energy, and the Poisson's ratio show the similar trend to prove that the tilt-cast Zr-53 BMG without Si possesses the best fracture toughness among these BMGs in this study.

Original languageEnglish
Pages (from-to)87-93
Number of pages7
JournalJournal of Alloys and Compounds
Volume614
DOIs
StatePublished - 25 Nov 2014

Keywords

  • Bulk amorphous alloy
  • Casting
  • Fracture toughness
  • Three point bending

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