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In-Situ Fracture Observation and Fracture Toughness Analysis of Zr-Based Amorphous Alloys Containing Ductile Dendrites

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Abstract

Effects of dendrite size on fracture properties of Zr-based amorphous alloys containing ductile β dendrites were explained by directly observing microfracture processes using an in-situ loading stage installed inside a scanning electron microscope (SEM) chamber. Three amorphous alloy plates having different thicknesses were fabricated by varying cooling rates after vacuum arc melting. The effective size of β dendrites was varied from 14.7 to 30.1 μm in the alloy plates, while their volume fraction was almost constant. According to microfracture observation of the alloy containing fine β dendrites, shear bands initiated at the amorphous matrix were connected with the notch tip as they were deepened through dendrites, which led to abrupt crack propagation. In the alloy containing coarser β dendrites, shear bands were initiated at the amorphous matrix to form a crack near the notch tip region and were expanded over large matrix areas. The crack propagation was frequently blocked by β dendrites, and many shear bands are formed near or in front of the propagating crack, thereby resulting in stable crack growth, which could be confirmed by the fracture resistance curve (R-curve) behavior. This increase in fracture resistance with increasing crack length could be explained by mechanisms of blocking of crack growth, multiple shear band formation, and crack blunting.

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Acknowledgments

This work was supported by the Center for Advanced Materials Processing (CAMP) of the 21st Century Frontier R&D Program (Grant No. F00030492007-311006000115) funded by the Ministry of Knowledge Economy, Korea.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Changwoo Jeon (Research Assistant), Choongnyun Paul Kim (Research Professor) & Sunghak Lee (Professor)

  2. Materials Science and Engineering Department, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Sunghak Lee (Professor)

Authors
  1. Changwoo Jeon
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  2. Choongnyun Paul Kim
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  3. Sunghak Lee
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Correspondence to Sunghak Lee.

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Manuscript submitted February 1, 2012.

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Jeon, C., Kim, C.P. & Lee, S. In-Situ Fracture Observation and Fracture Toughness Analysis of Zr-Based Amorphous Alloys Containing Ductile Dendrites. Metall Mater Trans A 43, 3675–3686 (2012). https://doi.org/10.1007/s11661-012-1200-y

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