Preparation of Zr60Ni21Al19 bulk metallic glass and compression behavior under high pressure

2008 ◽  
Vol 23 (9) ◽  
pp. 2346-2349 ◽  
Author(s):  
G. Li ◽  
Q. Jing ◽  
T. Xu ◽  
L. Huang ◽  
R.P. Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
High Strength ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Compression Behavior ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Diamond Anvil

Zr60Ni21Al19 metallic glass rod, with a diameter of 8 mm, is manufactured by copper mold casting. The as-cast bulk metallic glass (BMG) exhibits nearly zero plastic strain, but a high strength of 1.88 GPa. The compression behavior of this new zirconium-base ternary BMG under high pressure at ambient temperature in a diamond-anvil cell instrument has been unraveled using energy dispersive x-ray diffraction with a synchrotron radiation source. The investigation shows that the amorphous structure of Zr60Ni21Al19 is stable under pressures up to 24.5 GPa at room temperature. According to the Bridgman equation of state, the bulk modulus B0 = 96 GPa has been obtained.

Nucleation and growth in bulk metallic glass under high pressure investigated using in situ x-ray diffraction

2003 ◽  
Vol 83 (25) ◽  
pp. 5202-5204 ◽  
Author(s):  
W. H. Wang ◽  
P. Wen ◽  
D. Q. Zhao ◽  
M. X. Pan ◽  
T. Okada ◽  
...  
Keyword(s):  
High Pressure ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Nucleation And Growth ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Structural and Mechanical Characteristics of Cu50Zr43Al7 Bulk Metallic Glass Fabricated by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 775 ◽  
Author(s):  
Xiaoyang Lu ◽  
Mussokulov Nursulton ◽  
Yulei Du ◽  
Wenhe Liao
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Selective Laser Melting ◽  
Structural Relaxation ◽  
Mechanical Characteristics ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Scanning Calorimetry ◽  
Mold Casting ◽  
Induced Changes

In this work, the structural and mechanical characteristics of Cu50Zr43Al7 bulk metallic glass (BMG) fabricated by selective laser melting (SLM) are studied and the impacts from the SLM process are clarified. Cu50Zr43Al7 alloy specimens were manufactured by the SLM method from corresponding gas-atomized amorphous powders. The as-built specimens were examined in terms of phase structure, morphologies, thermal properties and mechanical behavior. The x-ray diffraction and differential scanning calorimetry results showed that structural relaxation and partial crystallization co-exist in the as-fabricated Cu50Zr43Al7 glassy samples. The nano- and micro- hardness and the elastic modulus of the SLM-fabricated Cu50Zr43Al7 BMG were higher than CuZrAl ternary BMGs with similar compositions prepared by conventional mold casting, which can be attributed to the structural relaxation in the former sample. However, the macro compressive strength of the SLM-fabricated Cu50Zr43Al7 BMG was only 1044 MPa mainly due to its porosity. This work suggests that the SLM process induced changes in structural and mechanical properties are significant and cannot be neglected in the fabrication of BMGs.

scholarly journals Crystallization of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass under high pressure examined byin situsynchrotron radiation x-ray diffraction

2006 ◽  
Vol 99 (2) ◽  
pp. 023525 ◽  
Author(s):  
C. Yang ◽  
W. K. Wang ◽  
R. P. Liu ◽  
Z. J. Zhan ◽  
L. L. Sun ◽  
...  
Keyword(s):  
High Pressure ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
X Ray Diffraction ◽  
X Ray

Rapid Solidification and Laser Cladding of Gas Atomized Ni-Nb-Sn Bulk Metallic Glass

2017 ◽  
Vol 899 ◽  
pp. 311-316 ◽  
Author(s):  
F.L. Catto ◽  
A.H.G. Gabriel ◽  
C. Bolfarini ◽  
Claudio Shyinti Kiminami ◽  
Conrado Ramos Moreira Afonso
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Laser Cladding ◽  
Vickers Microhardness ◽  
Steel Substrate ◽  
Spray Forming ◽  
Glassy Matrix ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Mold Casting

Glassy overspray powders of Ni59Nb35Sn6 (at%) bulk metallic glass (BMG) obtained by spray forming were used in order to produce coatings on AISI 1020 mild steel substrate by laser cladding of the pre-placed powders. Different laser parameters, resulting in a variation of the power density, PD (J/mm2), were tested with a Yb fiber laser (up to 500 W). Gas atomized powders, suction cast sample trough copper mold casting and the laser clad tracks were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and coatings were subjected to measurements of Vickers microhardness. Atomized powder obtained showed no crystalline phases formation up to 425 μm, indicating good glass forming ability (GFA) of Ni59Nb35Sn6 (at%) alloy. Microstructure characterization confirmed maximum glassy dimension of tc =1mm for the Ni59Nb35Sn6 (at%). Laser cladding track showed nanocrystalline phases embedded in a glassy matrix with Vickers microhardness ranging from 336 to 1184 HV.

A new Mg65Cu7.5Ni7.5Zn5Ag5Y10 bulk metallic glass with strong glass-forming ability

2003 ◽  
Vol 18 (10) ◽  
pp. 2288-2291 ◽  
Author(s):  
H. Ma ◽  
E. Ma ◽  
J. Xu
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Forming Ability ◽  
Copper Mold ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Mold Casting

We report a new Mg-based bulk metallic glass-forming alloy: Mg65Cu7.5Ni7.5Zn5 Ag5Y10. The alloy exhibits a glass-forming ability significantly stronger than all previously discovered Mg-based glass formers. Fully glassy rods 9 mm in diameter can be obtained by using copper mold casting. The critical cooling rate for glass formation was estimated to be <50 Ks−1. The reduced glass-transition temperature (Trg) of the glass was determined to be 0.59.

scholarly journals Non-crystalline samples under high-pressure conditions

2014 ◽  
Vol 70 (a1) ◽  
pp. C394-C394
Author(s):  
Liangliang Li ◽  
Renfeng Li ◽  
Lisa Luhongwang Liu ◽  
Arthur Haozhe Liu ◽  
Peter Chupas ◽  
...  
Keyword(s):  
High Pressure ◽  
Metallic Glass ◽  
Room Temperature ◽  
Imaging Techniques ◽  
Melting Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Dynamics ◽  
Diamond Anvil ◽  
Melting And Solidification

Taking advantage of synchrotron x-ray diffraction, PDF and tomographic techniques, the P-V curve of non-crystalline samples were studied under high-pressure conditions. Two element and several metallic glass cases were performed. The procedure of crystallization of amorphous Se upon compression at room temperature, which was studied in diamond anvil cell combined synchrotron x-ray PDF and 3D imaging techniques; the melting and solidification procedure of Ga in large volume press at room and high temperature; and complicated crystallization, re-rystalization, melting behavior of Ce-based metallic glass, will be presented to show the capability of revealing structure and dynamics behaviors in P-V-T-t domains using these advanced techniques.

Doubling the Critical Size for Bulk Metallic Glass Formation in the Mg–Cu–Y Ternary System

2005 ◽  
Vol 20 (9) ◽  
pp. 2252-2255 ◽  
Author(s):  
H. Ma ◽  
Q. Zheng ◽  
J. Xu ◽  
Y. Li ◽  
E. Ma
Keyword(s):  
Metallic Glass ◽  
Ternary System ◽  
Bulk Metallic Glass ◽  
Glass Formation ◽  
Composition Dependence ◽  
Critical Size ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Mold Casting

Mg−Cu−Y alloys with optimal glass forming ability have been found at off-eutectic compositions. The critical size for bulk metallic glass formation at the pinpointed compositions more than doubles that of the previously discovered eutectic Mg65Cu25Y10 alloy, leading to fully glassy rods with near-centimeter diameters in the ternary system upon copper mold casting. The result is a striking demonstration of the strong composition dependence of the glass forming ability, as well as of the need to scrutinize off-eutectic compositions. The implications of the discovery are discussed.

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