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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

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

Detail(s)

Original languageEnglish
Pages (from-to)87-93
Journal / PublicationJournal of Alloys and Compounds
Volume614
Online published19 Jun 2014
Publication statusPublished - 25 Nov 2014
Externally publishedYes

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 root m was achieved for the tilt-cast Zr53Cu30Ni9Al8. 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.

Research Area(s)

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