scholarly journals A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3842
Author(s):  
Wu ◽  
Zhang ◽  
Chen ◽  
Li ◽  
Zhang
Keyword(s):  
Metallic Glass ◽  
Melt Spinning ◽  
Amorphous State ◽  
Glass Composite ◽  
Solidification Temperature ◽  
Casting Technique ◽  
Glass Composites ◽  
Mold Casting ◽  
Temperature Ranges ◽  
The Common

To date it has not been possible to produce metallic glass strips with a thickness larger than 150 m via single-roller melt spinning technique, and it remains challenging to produce thick metallic glass strips. In this work, a multiple twin-roller casting technique is proposed for producing thick metallic glass and metallic glass composite strips. A triple twin-roller casting device, as a specific case of the multiple twin-roller, was designed and manufactured. The triple twin-roller device possesses a high cooling rate and involves a long contact time between the melt and the strip, which makes it an efficient technique for producing metallic glass strips that avoids crystallization, although the solidification temperature ranges of metallic glasses are as wide as several hundred Kelvins. The two prepared metallic glass (MG) strips are in a fully amorphous state, and the MG strip shows excellent capacity of stored elastic energy under 3-point bending. Furthermore, the Ti-based metallic glass composite strip produced via the triple twin-roller casting exhibits a novel microstructure with much finer and more homogenously orientated -Ti crystals, as compared with the microstructure of metallic glass composites produced by the common copper mold casting technique.

Phase Decomposition in Cu-Ti Metallic Glass

1983 ◽  
Vol 28 ◽  
Author(s):  
R. D. Shull ◽  
S. P. Singhal ◽  
B. Mozer ◽  
A. Maeland
Keyword(s):  
Neutron Diffraction ◽  
Metallic Glass ◽  
Melt Spinning ◽  
Large Angle ◽  
Amorphous State ◽  
Glass Ribbon ◽  
Amorphous Structure ◽  
Phase Decomposition ◽  
X Ray ◽  
Diffraction Patterns

ABSTRACTA metallic glass ribbon of Cu55Ti45 prepared by melt spinning was examined by x-ray, neutron, and electron diffraction, by small angle neutron diffraction (SANS), transmission electron microscopy (TEM), and by differential thermal analysis (DTA). In the liquid quenched condition large angle diffraction data (both x-ray and neutron) show the broad banded structure typical of the amorphous state. The SANS data, however, exhibit highly anisotropic patterns arising from the phase decomposition during solidification. Ribbons annealed below the glass transition temperature (Tg ) produced neutron diffraction patterns of materials with the same amorphous structure combined with a new short range order; and the SANS patterns retained the asymmetry of the as-quenched material. Ribbons annealed above the crystallization temperature (Tc) show both isotropic and anisotropic contributions to the SANS patterns. Formation of the equilibrium TiCu phase occurs directly from the metallic glass at Tc. The equilibrium Ti3Cu4 phase, however, forms from the TiCu phase at slightly higher temperatures.

scholarly journals Improvement the Plasticity via Dual-Amorphous and Nanocrystals Synergistically in a Zr-Cu-Al-Nb Bulk Metallic Glass Composite

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1158
Author(s):  
Tuo Wang ◽  
Xiaohui Yang ◽  
Qiang Li ◽  
Chuntao Chang
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Underlying Mechanism ◽  
Glass Composite ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites ◽  
First Time ◽  
Bulk Metallic Glass Composite

In this work, a small amount of Nb has been added in a Zr52Cu42.5Al5.5 bulk metallic glass, and a Zr52Cu42Al5.5Nb0.5 bulk metallic glass composite with dual-amorphous and nanocrystal structures has been developed for the first time. This in situ formed bulk metallic glass composite has a larger room compressive plasticity of above 13% than that of the Zr52Cu42.5Al5.5 bulk metallic glass. The excellent plasticity of the bulk metallic glass composite is attributed to the phase-separated matrix with micro-nanocrystal and the nanocrystallization during the deforming process. This work may give a new sight into design bulk metallic glass composites and the underlying mechanism for deformation.

Effect of Carbon-Nanotube Addition on Thermal Stability of Ti-Based Metallic Glass Composites

2007 ◽  
Vol 534-536 ◽  
pp. 865-868 ◽  
Author(s):  
Chih Feng Hsu ◽  
Pee Yew Lee
Keyword(s):  
Thermal Stability ◽  
Carbon Nanotube ◽  
Metallic Glass ◽  
Glassy Matrix ◽  
Glass Composite ◽  
Composite Powders ◽  
Glass Composites ◽  
Hardness Increase ◽  
Thermal Stability Of ◽  
Bulk Metallic Glass Composite

The preparation of Ti50Cu28Ni15Sn7 metallic glass composite powders was accomplished by the mechanical alloying of a pure Ti, Cu, Ni, Sn and carbon nanotube (CNT) powder mixture after 8 h milling. In the ball-milled composites, the initial CNT particles were dissolved in the Ti-based alloy glassy matrix. The thermal stability of the amorphous matrix is affected by the presence of the CNT particles. Changes in Tg and Tx suggest deviations in the chemical composition of the glassy matrix due to a partial dissolution of the CNT species in the amorphous phase. The bulk metallic glass composite was successfully prepared by vacuum hot pressing the as-milled CNT/ Ti50Cu28Ni15Sn7 metallic glass composite powders. A significant hardness increase with the CNT additions was observed for the consolidated composite compacts.

Mg-Y-Cu Bulk Nanocrystalline Matrix Composites Containing WC Particles

2006 ◽  
Vol 313 ◽  
pp. 25-30 ◽  
Author(s):  
Pee Yew Lee ◽  
C. Lo ◽  
Jason S.C. Jang ◽  
J.C. Huang
Keyword(s):  
Metallic Glass ◽  
Applied Pressure ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Glassy Matrix ◽  
Liquid Region ◽  
Glass Composite ◽  
Composite Powders ◽  
Glass Composites ◽  
Bulk Nanocrystalline

The preparation of Mg49Y15Cu36 metallic glass composite powders was accomplished by mechanical alloying of pure Mg, Y, Cu, and WC powder mixture after 10 h milling. In the ball-milled composites, initial WC particles were homogeneously dispersed in the Mg-based alloy glassy matrix. The metallic glass composites powders were found to exhibit a large supercooled liquid region before crystallization. Bulk metallic glass composites were formed by vacuum hot pressing the as-milled WC/ Mg49Y15Cu36 metallic glass composite powders at 473 K in the pressure range of 0.72-1.20 GPa. BMG composite with submicron WC particles homogeneously embedded in a highly dense nanocrystalline/amorphous matrix was successfully prepared under pressure of 1.20 GPa. It was found that the applied pressure during consolidation could enhance the thermal stability and promotes nanocrystallization of WC/ Mg49Y15Cu36 BMG composites.

Formation and Mechanical Properties of Mg-Cu-Al-Gd Bulk Metallic Glass Composites

2010 ◽  
Vol 650 ◽  
pp. 290-294
Author(s):  
Yi Ming Wang ◽  
Li Jing Zheng ◽  
Shu Jie Pang
Keyword(s):  
Mechanical Properties ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Alloy ◽  
Glassy Matrix ◽  
Crystalline Phases ◽  
Glass Composites ◽  
Al Content ◽  
Bulk Metallic Glass Composites ◽  
Mold Casting

The effect of Al addition to Mg65Cu25Gd10 glassy alloy on the microstructure, thermal properties and mechanical properties were investigated. The Mg65Cu25-xAlxGd10 (x=1-7at. %) bulk metallic glass composites were formed by copper mold casting, and the fraction and size of the crystalline phases in the glassy matrix changed with the Al content. The Mg65Cu24Al1Gd10 glass composite consisted of a small amount of crystalline phases in the glassy matrix possesses high compressive strength up to about 850 MPa.

scholarly journals Effect of Sample-Size on the Compression Deformation Behavior of a CuZr-Based Bulk Metallic Glass Composite

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 857
Author(s):  
Yongsheng Chen ◽  
Weizhong Liang ◽  
Longxing Wang ◽  
Kai Qi ◽  
Yang Wang ◽  
...  
Keyword(s):  
Yield Strength ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Deformation Behavior ◽  
Glassy Matrix ◽  
Glass Composite ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites ◽  
Deformation Behaviors ◽  
Bulk Metallic Glass Composite

The compressive deformation behaviors and microstructures of Cu45Zr48Al4Nb3 bulk metallic glass composites with diameters of 3, 2, and 1 mm were investigated systematically. It was found that the smallest sample showed the highest yield strength and compressive plasticity. The yield strength of the samples was found to depend on the fraction of their crystalline phases in the glassy matrix. The smaller samples showed larger free volumes, which is favorable for plastic deformation. The deformation behavior of the samples was found to depend on their size. The results obtained in this study will be helpful for investigating the mechanical behavior of metallic glass composites.

Cu-Zr-Ti Bulk Metallic Glass Composites Produced by Mechanical Alloying and Vacuum Hot-Pressing

2005 ◽  
Vol 475-479 ◽  
pp. 3443-3450 ◽  
Author(s):  
C.C. Wang ◽  
Chung Kwei Lin ◽  
Y.L. Lin ◽  
J.S. Chen ◽  
R.R. Jen ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Mechanical Alloying ◽  
Bulk Metallic Glass ◽  
Hot Pressing ◽  
Liquid Region ◽  
Glass Composite ◽  
Composite Powders ◽  
Glass Composites ◽  
Vacuum Hot Pressing ◽  
Pure Cu

In the present study, WC/Cu60Zr30Ti10 metallic glass composite powders were prepared by mechanical alloying of pure Cu, Zr, Ti, and WC powder mixtures. Cu60Zr30Ti10 metallic glass composite powders were obtained after 5 h of milling as confirmed by X-ray diffraction and differential scanning calorimetry. The metallic glass composites powders were found to exhibit a supercooled liquid region before crystallization. Bulk metallic glass (BMG) composites were synthesized by vacuum hot pressing the as-milled Cu60Zr30Ti10 metallic glass composite powders at 723 K in the pressure range of 0.72-1.20 GPa. BMG composite with submicron WC particles homogeneously embedded in a highly dense anocrystalline/amorphous matrix was successfully prepared under applied pressure of 1.20 GPa. It was found that the pressure could enhance the thermal stability and promotes nocrystallization of WC/Cu60Zr30Ti10 BMG composites.

Studies on Fe-Cr-Ni-Si-B Bulk Metallic Glass for Automotive Applications

2015 ◽  
Vol 1114 ◽  
pp. 68-75
Author(s):  
Mariana Lucaci ◽  
Delia Patroi ◽  
Violeta Tsakiris ◽  
Magdalena Valentina Lungu ◽  
Eugen Manta ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Melt Spinning ◽  
Copper Mold ◽  
Technological Parameters ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Melt Spin

Researches and developments were carried out for obtaining of bulk metallic glass (BMG) from the Fe-Cr-Ni-Si-B system. The used processing methods were copper mold casting and melt spinning method. The resulted materials are in form of sheets with sizes of 69.7 x 64 x 3/1.5 mm and of strips with thickness less than 50 microns, which were obtained by varying the melt spin technological parameters. The both processing variants are not suitable for obtaining such of alloy in bulk metallic glass form. Adding of zirconium to this alloy produces bulk metallic glasses only for the melt spin products. The DSC analysis emphases that the zirconium modified alloy processed by melt spinning method exhibits a high glass forming ability (GFA).

The effect of primary crystallizing phases on mechanical properties of Cu46Zr47Al7 bulk metallic glass composites

2006 ◽  
Vol 21 (10) ◽  
pp. 2638-2645 ◽  
Author(s):  
F. Jiang ◽  
Z.B. Zhang ◽  
L. He ◽  
J. Sun ◽  
H. Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Strain ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Martensite Phase ◽  
Compression Tests ◽  
High Fracture ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites ◽  
Mold Casting

Cu46Zr47Al7 bulk metallic glass (BMG) and its composites in plate with different thicknesses up to 6 mm were prepared by copper mold casting. Primary crystallizing phases with different microstructures and volume fractions could be obtained under different cooling rates, forming some composites with different mechanical properties. Under compression tests, the 2-mm-thick monolithic BMG has a yield strength of 1894 MPa and a high fracture strength of up to 2250 MPa at plastic strain up to 6%, exhibiting apparent “work-hardening” behavior. The 4-mm-thick Cu46Zr47Al7 BMG composite containing martensite phase yields at 1733 MPa and finally fails at 1964 MPa with a plastic strain of 3.7%.

Simulation Research on the Penetration Phenomenon of Long Rod Armour-Piercing Projectile with Different Materials

2011 ◽  
Vol 194-196 ◽  
pp. 3-7
Author(s):  
Wei Bing Li ◽  
Fei Fan ◽  
Xiao Ming Wang ◽  
Wen Bin Li ◽  
Chuang Chen
Keyword(s):  
Metallic Glass ◽  
Initial Velocity ◽  
The Self ◽  
Tungsten Alloy ◽  
Glass Composite ◽  
Head Shape ◽  
Simulation Research ◽  
Glass Composites ◽  
Long Rod ◽  
Penetration Velocity

Using the LS-DYNA software, this paper studied the penetration phenomenon that the long rod armour-piercing projectile with the material of Wf/Zr metallic glass composites and tungsten-alloy penetrating into target. It found that the 93W alloy projectile has a clear mushroom head, and the Wf/Zr metallic glass composite projectile has an acute head and appears “self-sharping” effect obviously. It studied the variation law of the penetration results parameters of the two materials at different penetration initial velocity, and found that the “self-sharping” effect of the Wf/Zr metallic glass composite projectile change to more obvious with the increasing of penetration velocity. It also obtained the change law of the projectile head shape with the penetration velocity.

Sign in / Sign up

Export Citation Format

Share Document