scholarly journals Soft Ferromagnetic Bulk Metallic Glass with Potential Self-Healing Ability

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1319
Author(s):  
Parthiban Ramasamy ◽  
Mihai Stoica ◽  
Gabriel Ababei ◽  
Nicoleta Lupu ◽  
Jürgen Eckert
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Vital Role ◽  
Self Healing ◽  
Local Melting ◽  
Mold Casting ◽  
Soft Ferromagnetic ◽  
Molten Droplets ◽  
Shear Transformation Zones ◽  
Ferromagnetic Bulk

A new concept of soft ferromagnetic bulk metallic glass (BMG) with self-healing ability is proposed. The specific [Fe36Co36B19.2Si4.8Nb4]100−x(Ga)x (x = 0, 0.5, 1 and1.5) BMGs prepared by copper mold casting were investigated as a function of Ga content. The Ga-containing BMGs still hold soft magnetic properties and exhibit large plastic strain of 1.53% in compression. Local melting during shearing produces molten droplets of several µm size throughout the fracture surface. This concept of local melting during shearing can be utilized to produce BMGs with self-healing ability. The molten regions play a vital role in deflecting shear transformation zones, thereby enhancing the mechanical properties.

scholarly journals Soft Ferromagnetic Bulk Metallic Glass with Potential Self-Healing Ability

2019 ◽  
Author(s):  
Parthiban Ramasamy ◽  
Mihai Stoica ◽  
Gabriel Ababei ◽  
Nicoleta Lupu ◽  
Jürgen Eckert
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Self Healing ◽  
Soft Ferromagnetic ◽  
Ferromagnetic Bulk

The Effect of Co Addition on Glassy Forming Ability and Soft Magnetic Properties of Fe-Si-B-P Bulk Metallic Glass

2012 ◽  
Vol 508 ◽  
pp. 112-116 ◽  
Author(s):  
Xue Li ◽  
Yan Zhang ◽  
Hidemi Kato ◽  
Akihiro Makino ◽  
Akihisa Inoue
Keyword(s):  
Magnetic Properties ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Alloy ◽  
High Strength ◽  
Alloy System ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Co Addition ◽  
Ferromagnetic Bulk

We Successfully Prepared the Rod Glassy Samples of (Fe1-xCox)76Si9B10P5 (x = 0~0.4) Bulk Metallic Glass (BMG) with the Diameters up to 3.0 mm by Substituting Fe for a Small Amount of Co Element. A Certain Amount of Co Substitution for Fe Contributes to the Increase of the Glass-Forming Ability (GFA) while Maintaining Good Mechanical Properties (the Fracture Strength up to 3700 MPa). This Co-Added Ferromagnetic Bulk Glassy Alloy System Also Exhibits a Higher Saturation Magnetization of 1.49 T and Lower Coercive Force (Hc, 1.2 A/m). The Fe-Based BMGs with Alloying a Small Amount of Co Element Demonstrate Excellent Combination of High GFA, Good Soft-Magnetic Properties as Well as High Strength.

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.

scholarly journals Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

2009 ◽  
Vol 24 (8) ◽  
pp. 2697-2704 ◽  
Author(s):  
Alban Dubach ◽  
K. Eswar Prasad ◽  
Rejin Raghavan ◽  
Jorg F. Löffler ◽  
Johann Michler ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Free Volume ◽  
Structural State ◽  
Shear Bands ◽  
Compressive Yield Strength ◽  
Pressure Sensitivity ◽  
Constraint Factor ◽  
Shear Transformation Zones

Instrumented indentation experiments on a Zr-based bulk metallic glass (BMG) in as-cast, shot-peened and structurally relaxed conditions were conducted to examine the dependence of plastic deformation on its structural state. Results show significant differences in hardness, H, with structural relaxation increasing it and shot peening markedly reducing it, and slightly changed morphology of shear bands around the indents. This effect is in contrast to uniaxial compressive yield strength, σy, which remains invariant with the change in the structural state of the alloys investigated. The plastic constraint factor, C = H/σy, of the relaxed BMG increases compared with that of the as-cast glass, indicating enhanced pressure sensitivity upon annealing. In contrast, C of the shot-peened layer was found to be similar to that observed in crystalline metals, indicating that severe plastic deformation could eliminate pressure sensitivity. Microscopic origins for this result, in terms of shear transformation zones and free volume, are discussed.

In situ spherical B2 CuZr phase reinforced ZrCuNiAlNb bulk metallic glass matrix composite

2010 ◽  
Vol 25 (6) ◽  
pp. 1159-1163 ◽  
Author(s):  
Jinmin Liu ◽  
Haifeng Zhang ◽  
Huameng Fu ◽  
Zhuang-Qi Hu ◽  
Xiaoguang Yuan
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Matrix Composite ◽  
Glass Matrix ◽  
Shear Bands ◽  
Glass Matrix Composite ◽  
Mold Casting ◽  
Metallic Glass Matrix Composite ◽  
Nb Addition

In situ microlevel spherical B2 CuZr phase reinforced Zr49.5Cu36.45Ni4.05Al9Nb1 bulk metallic glass matrix composite was prepared successfully by the copper mold casting method. It was found that mechanical properties of Zr50.5Cu36.45Ni4.05Al9 alloy were improved largely due to the Nb addition. The room-temperature compressive fracture strength and plastic strain for Zr49.5Cu36.45Ni4.05Al9Nb1 rod with a diameter of 5 mm reaches 2037 MPa and 8%, respectively. The improvements are attributed to the precipitation of the spherical B2 CuZr phase distributed uniformly in amorphous matrix, which effectively hampers the propagation of shear bands by deflecting them at the interface and by a multiplication mechanism.

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.

Magnetic aspects of the ferromagnetic “bulk metallic glass” alloy system Nd–Fe–Al

2006 ◽  
Vol 299 (2) ◽  
pp. 265-280 ◽  
Author(s):  
R.W. McCallum ◽  
L.H. Lewis ◽  
M.J. Kramer ◽  
K.W. Dennis
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Alloy System ◽  
Ferromagnetic Bulk ◽  
Glass Alloy

Fabrication of ternary Mg–Cu–Gd bulk metallic glass with high glass-forming ability under air atmosphere

2003 ◽  
Vol 18 (7) ◽  
pp. 1502-1504 ◽  
Author(s):  
H. Men ◽  
D. H. Kim
Keyword(s):  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Glass Formation ◽  
Glass Forming Ability ◽  
Casting Method ◽  
Glass Forming ◽  
Air Atmosphere ◽  
Mold Casting ◽  
Order Of Magnitude

A new Mg65Cu25Gd10 alloy having significantly improved glass-forming ability (GFA) has been developed. In this article, we show that the ternary Mg65Cu25Gd10 bulk metallic glass with diameter of at least 8 mm can successfully be fabricated by a conventional Cu-mold casting method in air atmosphere. The critical cooling rate for glass formation was estimated on the order of magnitude of approximately 1 K/s. When compared with the GFA of Mg65Cu25Y10 alloy, the significantly improved GFA of Mg65Cu25Gd10 alloy cannot be explained by ΔTx and Trg values.

Sign in / Sign up

Export Citation Format

Share Document