Influence of crystallinity on thermo-process ability and mechanical properties in a Au-based bulk metallic glass

被引：14
|
作者：
Cardinal, S. [1 ,2 ]
Pelletier, J. M. [1 ,2 ]
Eisenbart, M. [3 ]
Klotz, U. E. [3 ]
机构：
[1] Univ Lyon, CNRS, F-69621 Villeurbanne, France
[2] INSA Lyon, MATEIS, UMR5510, F-69621 Villeurbanne, France
[3] FEM, Res Inst Precious Met & Met Chem, Katharinenstr 17, D-73525 Schwabisch Gmund, Germany
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 660卷
关键词：
Au-based bulk metallic glass; Mechanical properties; Thermo-processing; Crystallinity; Toughness; TOUGHNESS; ALLOY; DEFORMATION; PLASTICITY; FRAGILITY; BEHAVIOR; FRACTURE;
D O I：
10.1016/j.msea.2016.02.078
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：158 / 165
页数：8
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