Formation of a Crystalline-Glass Composite in a Cu-Based Bulk Metallic Glass by Using the Cu-Pb Monotectic System

2007 ◽  
Vol 124-126 ◽  
pp. 1501-1504
Author(s):  
Dae Han Yoo ◽  
Hee Sam Kang ◽  
Woo Young Yoon
Keyword(s):  
Electron Microscope ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Phase ◽  
Fracture Strain ◽  
Monotectic Reaction ◽  
Glass Composite ◽  
Transmission Electron ◽  
Monotectic System ◽  
Compressive Tests

To synthesize a crystalline-glass composite in a Cu-based bulk metallic glass, the monotectic reaction was used. The (Zr-Sn-Pb)-rich crystalline phase was found to coexist with the (Cu-Ti-Ni)-rich glassy phase during the process of quenching from the melt in the (Cu47Ti33Zr11Ni6Sn2Si1)100-x+Pbx=1,2 system. Microstructures consisting of uniformly dispersed crystalline particles in the amorphous matrix were observed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Compressive tests demonstrated that the fracture strain of the sample with a Pb content of 1 at% was three times higher than that of the sample with no Pb.

Microstructure of Gold Nano-Crystals from Nanometer to Micrometer Lengthscale in Gold Bulk Metallic Glass

2014 ◽  
Vol 983 ◽  
pp. 59-62
Author(s):  
Nirut Boonchu ◽  
Anan Lawan ◽  
Kamolchanok Thipayarat ◽  
Suphakit Pintasiri ◽  
Worasit Kanjanakijkasem ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Transmission Electron Microscope ◽  
Amorphous Matrix ◽  
Amorphous Solid ◽  
Phase Evolution ◽  
Copper Plate ◽  
Cooling Rates ◽  
Transmission Electron

Gold based bulk metallic glass was synthesized at with different quenching rates. Au54Ag5Pd2Cu24.3Si14.7 alloy ingots were cast into wedge shape and cone shape samples. The critical casting thickness of this alloy composition was found to be 4 mm when cast in copper mold. Completely amorphous structure as found in sections thinner than 4 mm when considering a infinite copper plate geometry. In locations with slower cooling rates, there are small fractions of transformed nanocrystals. The transmission electron microscope (TEM) study of Au54Ag5Pd2Cu24.3Si14.7 solidified microstructure could offer snap shots of nucleation and growth of crystals from nanometer to micrometer length-scale as evolved with different cooling rates. The phase evolution was recorded by transmission electron microscope study, electron diffraction and metallography using scanning electron microscope. The specimens comprised of both fully amorphous solid and nanocomposites which were the combination of nano-crystals of controlled sizes in amorphous matrix. Vickers hardness values increased to 350-450 Hv, when compared to sub 100-150 Hv level of conventional 18-k gold alloys as cast. The study offers a revolutionary way to create ultrahigh strength bulk metals that comprise of large percentage of nano-crystals in amorphous matrix.

Zr-based bulk metallic glass composite with in situ precipitated nanocrystals

2014 ◽  
Vol 586 ◽  
pp. 155-158 ◽  
Author(s):  
Shengli Zhu ◽  
Guoqiang Xie ◽  
Hao Wang ◽  
Xianjin Yang ◽  
Zhenduo Cui ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Composite ◽  
Bulk Metallic Glass Composite

scholarly journals Slip statistics for a bulk metallic glass composite reflect its ductility

2018 ◽  
Vol 124 (18) ◽  
pp. 185101 ◽  
Author(s):  
Wendelin J. Wright ◽  
Alan A. Long ◽  
Xiaojun Gu ◽  
Xin Liu ◽  
Todd C. Hufnagel ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Composite ◽  
Bulk Metallic Glass Composite

Quantitatively determining the martensitic transformation in a CuZr-based bulk metallic glass composite

2019 ◽  
Vol 782 ◽  
pp. 961-966 ◽  
Author(s):  
Peng Xue ◽  
Yongjiang Huang ◽  
Simon Pauly ◽  
Songshan Jiang ◽  
Shu Guo ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Composite ◽  
Bulk Metallic Glass Composite

Investigation of a ductile and corrosion-resistant Pd79Au1.5Ag3Si16.5 bulk metallic glass

2010 ◽  
Vol 25 (10) ◽  
pp. 1943-1949
Author(s):  
N. Chen ◽  
C.L. Qin ◽  
G.Q. Xie ◽  
D.V. Louzguine-Luzgin ◽  
A. Inoue
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
High Thermal Stability ◽  
Corrosion Resistant ◽  
Excellent Corrosion Resistance ◽  
Potential Applications ◽  
Bulk Glassy Alloy ◽  
High Degree

A new Pd79Au1.5Ag3Si16.5 bulk metallic glass was successfully synthesized in a maximum casting thickness range to 3 mm. Upon heating, the single glassy phase decomposed into Pd-rich crystalline phases and a Si-rich amorphous phase due to solute partitioning. In addition to high thermal stability, this bulk glassy alloy also exhibited a high degree of ductility and excellent corrosion resistance, showing potential applications as biomaterials.

NANOSCALE DIMPLES AND PERIODIC CORRUGATIONS ON FRACTURE SURFACE OF Zr-BASED BULK METALLIC GLASS COMPOSITE

2019 ◽  
Vol 26 (08) ◽  
pp. 1950037
Author(s):  
BO SHI ◽  
SHIYU LUAN ◽  
PEIPENG JIN
Keyword(s):  
Fracture Surface ◽  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Crystallization Behavior ◽  
Glass Composite ◽  
Bulk Metallic Glass Composite

Nanoscale dimples and periodic corrugations are observed on the fracture surface of Zr-based bulk metallic glass composite (BMGC). The nanoscale periodic corrugations display a curved shape, which is different from that observed in previous works. In addition, the crystallization behavior of [Formula: see text][Formula: see text][Formula: see text][Formula: see text] BMG was investigated. The second crystallization event of Zr-Cu-Ni-Al BMG can be controlled by annealing or tuning cooling rate. The in situ Zr-based BMGC was prepared via lowering cooling rate. The Zr-based BMGC displays completely brittleness.

Sign in / Sign up

Export Citation Format

Share Document