Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 660, Issue -, Pages 158-165Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.02.078
Keywords
Au-based bulk metallic glass; Mechanical properties; Thermo-processing; Crystallinity; Toughness
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The present investigation addresses the impact of crystallinity on the mechanical properties: hardness (HV) and toughness (K-IC) in an Au(49)cu(26.9)Ag(5.5)Pd(2.3)Si(16.3) BMG which appears especially attractive for applications in jewelry and watch making industries. Thermal stability is first determined using differential scanning calorimetry (DSC), X-ray diffraction and thermo-mechanical analysis (TMA). Then the conditions (time, temperature) in which crystallization is observed (during annealing above the glass transition temperature) and the kinetics are determined. Results show an increase of hardness proportional to the volume fraction of the crystalline phase (phi) (from about 350 HV up to about 480 HV), and a drastic reduction in fracture toughness from about 20 MPa root m down to 1.5 MPa root m for fully crystalline structure. Finally the conditions required achieving a good compromise between hardness and toughness are established. (C) 2016 Elsevier B.V. All rights reserved.
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