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Title: “Ductile” Fracture of Metallic Glass Nanolaminates

Journal Article · · Advanced Materials Interfaces
 [1];  [2];  [3];  [4];  [5];  [1];  [6];  [3];  [5]
  1. Department of Mechanical Engineering Texas A&,M University College Station TX 77843‐3123 USA
  2. Department of Materials Science and Engineering Texas A&,M University College Station TX 77843‐3003 USA
  3. Department of Materials Science and NanoEngineering Rice University Houston TX 77005‐1827 USA
  4. Department of Mechanical &, Materials Engineering University of Nebraska‐Lincoln NE 68588 USA
  5. School of Materials Engineering Purdue University West Lafayette IN 47907 USA
  6. School of Materials Engineering Purdue University West Lafayette IN 47907 USA, School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907 USA

Abstract Most metallic glasses are brittle as deformation induces low‐density sporadic shear bands and severe shear localization proceeding catastrophic failure. Here, it is demonstrated that the introduction of crystalline nanolayers with appropriate dimension can substantially suppress shear localization in metallic glasses, as manifested by ubiquitous ductile dimples in amorphous phase. Furthermore, dimple sizes can be tailored by tuning the dimension of layer thickness. Additionally unlike instantaneous crack propagation occurring in most metallic glasses, crack propagation occurs in a highly periodic and “zigzag” fashion, and shows clear size dependence for metallic glass nanolaminates. Thus, it is a promising approach to promote ductility in metallic glasses while maintaining high strength by synthesizing metallic glass nanolaminates with certain layer thickness. Molecular dynamics simulations demonstrate that crystalline/amorphous interfaces can block crack propagation in crystalline layers and delocalize strain in amorphous layers, and suggest that “zigzag” crack propagation could be achieved through dislocation slips in crystalline layers.

Sponsoring Organization:
USDOE
OSTI ID:
1373827
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Vol. 4 Journal Issue: 21; ISSN 2196-7350
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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