Microstructures and properties of the tungsten wire/particle reinforced Zr57Nb5Al10Cu15.4Ni12.6 metallic glass composites

2002 ◽  
Vol 754 ◽  
Author(s):  
Haein Choi-Yim ◽  
Jan Schroers ◽  
William L. Johnson
Keyword(s):  
Metallic Glass ◽  
Tungsten Wire ◽  
High Strength ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Glass Composites ◽  
Glass Forming ◽  
The Matrix ◽  
Glass Matrix Composites

ABSTRACTTungsten wire or particle reinforced metallic glass matrix composites are produced by infiltrating liquid Zr57Nb5Al10Cu15.4Ni12.6 (Vit106) into tungsten reinforcements at 1150 K and at 1425 K. X-ray diffraction, differential scanning calorimetry, and scanning electron microscopy are carried out to characterize the composite. The matrix of the composite processed at 1150 K is mostly amorphous, with some embedded crystals. During processing, tungsten dissolves in the glass-forming melt and upon quenching precipitates over a relatively narrow zone near the interface between the tungsten and matrix. In the composites processed at 1425 K, tungsten dissolves in the melt and diffuses through the liquid medium, and then reprecipitates upon quenching. The faster kinetics at this high temperature results uniform distribution of the crystals throughout the matrix. Mechanical properties of the differently processed composites containing wires and particles are compared and discussed. The composites exhibit a plasticity of up to 16 % without sacrificing the high strength to failure that is comparable to monolithic Vit 106.

Synthesis and Properties of Bulk Metallic Glass Matrix Composites

1998 ◽  
Vol 554 ◽  
Author(s):  
Haein Choi-Yim ◽  
Ralf Busch ◽  
William L. Johnson
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Matrix ◽  
Compressive Strain ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Glass Forming ◽  
The Matrix ◽  
Glass Matrix Composites ◽  
Thermal Stability Of

AbstractBulk metallic glass matrix composites are processed and investigated by X-ray diffraction, DSC, optical microscopy, SEM, microprobe, TEM, and mechanical testing. Ceramics such as SiC, WC, or TiC, and the metals W or Ta are introduced as reinforcements into the metallic melt. The metallic glass matrix remains amorphous after adding up to 30 vol% of particles. The thermal stability of the matrix does not deteriorate after adding the particles. ZrC layers form at the interfaces between the bulk metallic glasses and the WC or SiC particles. Si and W are released into the matrix in which Si enhanced the glass forming ability. The composites are tested in compression and tension experiments. Compressive strain to failure increases by over 300% compared to the unreinforced Zr57Nb5Al10Cu15.4Ni12.6 and the energy to break of the tensile samples increases by over 50% adding 15 vol. % W.

Internal Stresses in Bulk Metallic Glass Matrix Composites

2000 ◽  
Vol 644 ◽  
Author(s):  
Ersan Üstündag ◽  
Danut Dragoi ◽  
Bjorn Clausen ◽  
Donald Brown ◽  
Mark A. M. Bourke ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Internal Stresses ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
The Matrix ◽  
Superior Mechanical Properties ◽  
Two Phases ◽  
Glass Matrix Composites ◽  
Metallic Fibers

AbstractComposites consisting of a bulk metallic glass (BMG) matrix and metallic fibers or particulates have been shown to exhibit superior mechanical properties as compared to monolithic BMGs. To understand the role of reinforcements in this improvement, it is necessary to investigate the state of internal stresses in these composites. These stresses arise from the thermal expansion mismatch between the reinforcement and the matrix, as well as the elastic and plastic incompatibilities between the two phases. Neutron diffraction and synchrotron X-ray diffraction were used to measure these mismatch-induced stresses in BMG-matrix composites with various reinforcements: continuous W fibers, W or Ta particles, and dendritic, in-situ formed precipitates. The results are compared to numerical and analytical predictions of internal stresses.

Influence of Nb on the Interface Structure of Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composites

2005 ◽  
Vol 475-479 ◽  
pp. 3389-3392 ◽  
Author(s):  
Mei Ling Wang ◽  
Xidong Hui ◽  
Guo Liang Chen
Keyword(s):  
Metallic Glass ◽  
Matrix Composite ◽  
Interface Structure ◽  
Eutectoid Reaction ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites ◽  
Melt Infiltration ◽  
Glass Matrix Composites

Zr-based metallic-glass matrix composites, which are reinforced by continuous tungsten fibers, were prepared by melt infiltration casting. The interface structure was analyzed by using X-Ray diffraction, SEM and EPMA. The results illustrate that for the Zr55Al10Ni5Cu30 matrix composite, in addition to the interface diffusion, an interface eutectoid reaction between W fiber and Zr in the liquid state takes place and forms W5Zr3 phase at the interface during casting, the interface is included in Class Ⅲ system; but for (Zr55Al10Ni5Cu30)0.98Nb2 and Zr57Al10Ni12.6Cu15.4Nb5 matrix composite, the addition of Nb restrains the interface eutectoid reaction effectively, which may be attributed to reducing diffusion coefficient of Zr through the interface, and there is only a thinner diffusion layer at the interfaces, the type of interface is changed to the Class Ⅱ system

Explosive Compaction of Metallic Glass Particles Reinforced Aluminium Matrix Composites

2011 ◽  
Vol 189-193 ◽  
pp. 2472-2476
Author(s):  
Jin Xiang Wang ◽  
Xiao Li Zhang ◽  
Nan Zhou ◽  
Zheng Zhao
Keyword(s):  
Metallic Glass ◽  
Amorphous Phase ◽  
Mass Fraction ◽  
Aluminium Matrix ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Explosive Compaction ◽  
X Ray ◽  
Aluminium Matrix Composites ◽  
The Matrix

In this paper the metallic glass particles reinforced aluminium matrix composites without obvious defects were obtained successfully by explosive compaction of mixed powders. The mass fraction of the amorphous phase is 10%, 15% and 20% respectively in the specimens. The scaning electric microscope micrographs of the composites show that the metallic glass particles are uniformly distributed in the matrix. The x-ray diffraction and differential thermal analysis of the composite specimens show that the amorphous phase is maintained in the composites without crystallization during the compaction. Finally the influences of macro-temperature rise and micro-heat transfer on the crystallization were analyzed.

Origin of the Simultaneous Improvement of Strength and Plasticity in Ti-based Bulk Metallic Glass Matrix Composites

2005 ◽  
Vol 20 (9) ◽  
pp. 2474-2479 ◽  
Author(s):  
Yu Chan Kim ◽  
Eric Fleury ◽  
Jae-Chul Lee ◽  
Do Hyang Kim
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Coefficient Of Thermal Expansion ◽  
Shear Bands ◽  
Matrix Composites ◽  
The Matrix ◽  
The Difference ◽  
Strength And Plasticity ◽  
Glass Matrix Composites ◽  
Classical Elasticity Theory

W-rich particle-reinforced Ti-based bulk metallic glass (BMG) matrix composites with a compressive strength approaching 3 GPa and a fracture strain of approximately 12% were developed. In contrast to most existing BMG matrix composites, in which the improved ductility was obtained only at the expense of the strength, the composites developed in this study exhibited a significant enhancement in their strength, as well as an improvement in the plasticity. This improvement in the plasticity was attributed to the blocking and circumscription of the shear band propagation, leading to the formation of a large number of shear bands. Using a classical elasticity theory of inclusions, the improvement of the strength was interpreted as resulting from the generation of tensile residual stresses in the matrix due to the difference in the coefficient of thermal expansion between the W-rich particles and the BMG matrix.

Resolving ensembled microstructural information of bulk-metallic-glass-matrix composites using synchrotron x-ray diffraction

2010 ◽  
Vol 97 (17) ◽  
pp. 171910 ◽  
Author(s):  
J. W. Qiao ◽  
E. W. Huang ◽  
F. Jiang ◽  
T. Ungár ◽  
G. Csiszár ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Matrix ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Matrix Composites
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