Formation of Mg–Cu–Ni–Ag–Zn–Y–Gd Bulk Glassy Alloy by Casting into Cone-shaped Copper Mold in Air Atmosphere

2005 ◽  
Vol 20 (6) ◽  
pp. 1465-1469 ◽  
Author(s):  
E.S. Park ◽  
D.H. Kim
Keyword(s):  
Glass Formation ◽  
Glassy Alloy ◽  
Compressive Loading ◽  
Maximum Diameter ◽  
Copper Mold ◽  
Casting Method ◽  
Glass Forming ◽  
Air Atmosphere ◽  
Mold Casting ◽  
Bulk Glassy Alloy

A new Mg–Cu–Ni–Ag–Zn–Y–Gd alloy with significantly improved glass forming ability (GFA) was developed in this work. Mg65Cu7.5Ni7.5Ag5Zn5Y5Gd5 bulk metallic glass (BMG) with a diameter of 14 mm was successfully fabricated by conventional copper mold casting method in air atmosphere. The critical cooling rate for glass formation was estimated to be about 20 K/s. When the maximum diameter for glass formation was compared with those previously reported for Mg-based alloys, the Mg65Cu7.5Ni7.5Ag5Zn5Y5Gd5 alloy showed the highest GFA. However, when the GFA was compared with those of Mg-TM-RE alloys (TM: Cu, Ni, Zn, and Ag; RE: Y and Gd), the significant improved GFA of the Mg–Cu–Ni–Zn–Ag–Y–Gd alloy cannot be properly represented by ΔTx, Trg, K, and γ parameters. In contrast to most of the Mg-based BMGs reported so far, the Mg65Cu7.5Ni7.5Ag5Zn5Y5Gd5 BMG exhibits yielding and plastic deformation during compressive loading.

Formation of Ca–Mg–Zn bulk glassy alloy by casting into cone-shaped copper mold

2004 ◽  
Vol 19 (3) ◽  
pp. 685-688 ◽  
Author(s):  
E.S. Park ◽  
D.H. Kim
Keyword(s):  
Glassy Alloy ◽  
Copper Mold ◽  
Casting Method ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Air Atmosphere ◽  
Mold Casting ◽  
Bulk Glassy Alloy ◽  
Zn Alloy ◽  
Zn Alloys

A new Ca–Mg–Zn alloys having significantly improved glass-forming ability (GFA) has been developed. The ternary Ca65Mg15Zn20 bulk metallic glass with diameter of at least 15 mm is successfully fabricated by conventional copper-mold casting method in air atmosphere. The critical cooling rate for glass formation in the cone-shaped copper mold is less than 20 K/s. When compared with the GFA of Ca–Mg–M (M: Cu, Ni, and Ag) alloys, the significantly improved GFA of the Ca–Mg–Zn alloy cannot be represented by ΔTx, Trg, K, and γ parameters.

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.

Formation of Large Bulk [(Fe0.5Co0.5)0.75B0.20Si0.05]96Nb4 Glassy Alloy by Flux Melting and Water Quenching

2005 ◽  
Vol 903 ◽  
Author(s):  
Teruo Bitoh ◽  
Akihiro Makino ◽  
Akihisa Inoue ◽  
A. Lindsay Greer
Keyword(s):  
Glassy Alloy ◽  
Water Quenching ◽  
Maximum Diameter ◽  
Copper Mold ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Large Bulk ◽  
Nucleation Sites ◽  
Mold Casting ◽  
Molten Flux

AbstractThe large bulk glassy [(Fe0.5Co0.5)0.75B0.20Si0.05]96Nb4 alloy specimens with the diameters up to 7.7 mm have been prepared by water quenching the melt immersed in the molten flux of B2O3. The maximum diameter of the obtained specimens is approximately 1.5 times as large as the pre-vious result for copper mold casting should be cooled at the higher rate than the of water quenching. The flux melting improves the glass-forming ability by the elimination of oxides and other inclusion in the molten metal which act as heterogeneous nucleation sites for crystallization.

Effect of Ag Addition on the Improvement of Glass-forming Ability and Plasticity of Mg–Cu–Gd Bulk Metallic Glass

2005 ◽  
Vol 20 (9) ◽  
pp. 2379-2385 ◽  
Author(s):  
E.S. Park ◽  
J.Y. Lee ◽  
D.H. Kim
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Compressive Loading ◽  
Glass Forming Ability ◽  
Partial Substitution ◽  
Casting Method ◽  
Glass Forming ◽  
Air Atmosphere ◽  
Mold Casting ◽  
Ag Substitution

The effect of Ag substitution for Cu on the glass forming ability (GFA) and mechanical properties of Mg65Cu25−xAgxGd10 (x = 0, 5, 10, 15, 20, 25) alloyswere investigated using x-ray diffractometry and differential scanning calorimetry.The partial substitution of Cu by Ag in Mg65Cu25Gd10 promoted the GFA. Mg65Cu20Ag5Gd10 bulk metallic glass (BMG) with a diameter of 11 mm could be fabricated by conventional copper-mold casting method in air atmosphere. The Mg65Cu20Ag5Gd10 BMG exhibits yielding and plastic deformation during compressive loading. The compressive fracture strength, total strain to failure, and plastic strain to failure of the Mg65Cu20Ag5Gd10 BMG were 909 MPa, 2.21% and 0.5%, respectively.

Effects of C Addition on Glass-Forming in FeCPSiBMoMn Bulk Metallic with Good Soft-Magnetic Properties

2011 ◽  
Vol 399-401 ◽  
pp. 1012-1015
Author(s):  
Jian Peng Wu ◽  
Shan Dong Li ◽  
Mei Mei Liu ◽  
Xin Le Cai ◽  
Yi Hu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Metallic Glasses ◽  
Low Cost ◽  
Glassy Alloy ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Casting Method ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Mold Casting

The effect of C substitution on the glass forming ability (GFA) and soft magnetic properties of Fe-based bulk metallic glasses (BMG) Fe79.4-xCxSi3.5B5.1P8.9Mo3Mn0.1(x = 4.2, 5.2, and 7.0) alloys have been investigated. It is revealed that fully glassy alloy rods with diameters up to 4 mm can be prepared by conventional copper mold casting method even using the low-cost industrial Fe-P master alloy. Properly substituting of Fe by C gives rise to an enhancement of GFA. Moreover, all the samples exhibit good soft magnetic properties with high saturation magnetization up to 1.16 T and low coercivity of 204 A/m.

Understanding the Glass-forming Ability of Cu50Zr50 Alloys in Terms of a Metastable Eutectic

2005 ◽  
Vol 20 (9) ◽  
pp. 2307-2313 ◽  
Author(s):  
W.H. Wang ◽  
J.J. Lewandowski ◽  
A.L. Greer
Keyword(s):  
Metallic Glasses ◽  
Glass Formation ◽  
Composition Range ◽  
Intermetallic Phase ◽  
Glass Forming Ability ◽  
Copper Mold ◽  
Wide Composition Range ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Mold Casting

Interest in finding binary alloys that can form bulk metallic glasses has stimulated recent work on the Cu–Zr system, which is known to show glass formation over a wide composition range. This work focuses on copper mold casting of Cu50Zr50 (at.%), and it is shown that fully amorphous rods up to 2-mm diameter can be obtained. The primary intermetallic phase competing with glass formation on cooling is identified, and the glass-forming ability is interpreted in terms of a metastable eutectic involving this phase. Minor additions of aluminum increase the glass-forming ability: with addition of 4 at.% Al to Cu50Zr50, rods of at least 5-mm diameter can be cast fully amorphous. The improvement of glass-forming ability is related to suppression of the primary intermetallic phase.

Effect of Alloy Composition on the Glass Forming Ability in Ca-Mg-Zn Alloy System

2005 ◽  
Vol 475-479 ◽  
pp. 3415-3418 ◽  
Author(s):  
Eun Soo Park ◽  
Won Tae Kim ◽  
Do Hyang Kim
Keyword(s):  
Alloy Composition ◽  
Ternary Eutectic ◽  
Alloy System ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Maximum Diameter ◽  
Glass Forming ◽  
Air Atmosphere ◽  
Mold Casting ◽  
Zn Alloy

The effect of alloy composition on the glass forming ability (GFA) of the Ca-Zn-Mg alloys has been investigated in the present study. The alloy compositions investigated are near Ca-rich ternary eutectic composition; Ca60Mg15Zn25, Ca65Mg10Zn25, Ca65Mg15Zn20, Ca65Mg20Zn15, and Ca70Mg15Zn15. Bulk metallic glass (BMG) samples with the diameter larger than 5 mm are fabricated by conventional copper mold casting method in air atmosphere. Among the parameters representing the glass forming ability, Trg and γ parameters exhibit good correlation with the maximum diameter of the fully amorphous structure in the alloy compositions investigated in the present study.

Formation and mechanical properties of Cu–Hf–Al bulk glassy alloys with a large supercooled liquid region of over 90 K

2003 ◽  
Vol 18 (6) ◽  
pp. 1435-1440 ◽  
Author(s):  
Akihisa Inoue ◽  
Wei Zhang
Keyword(s):  
Glassy Alloy ◽  
Ternary Systems ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Copper Mold ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Glassy Alloys ◽  
Mold Casting

New Cu-based bulk glassy alloys with large supercooled liquid regions and high mechanical strength were formed in Cu–Hf–Al ternary systems. The large supercooled liquid region exceeding 70 K was obtained in the composition range of 40 at.% Hf at 2.5% Al, 37.5–50% Hf at 5% Al, and 45% Hf at 7.5% Al. The largest supercooled liquid region ΔTx(= Tx – Tg) was 91 K for Cu50Hf45Al5 alloy, and the highest reduced glass-transition temperature was 0.63 for Cu50Hf42.5Al7.5 and Cu52.5Hf40Al7.5 alloys. The alloys with large ΔTx values above 50 K were formed into bulk glassy rods with diameters up to 3 mm by copper mold casting, and the glassy alloy rods exhibited high compressive fracture strength of 2260 to 2370 MPa and Young's modulus of 121 to 128 GPa combined with elastic elongation of 1.9% to 2.0% and plastic elongation of 0.2% to 0.6%. No bulk glassy alloys were formed in the Cu–Hf binary system by copper mold casting, and, hence, the addition of 2.5% to 7.5% Al to Cu–Hf alloys was very effective for increasing glass-forming ability as well as the stabilization of supercooled liquid. The effectiveness can be interpreted on the basis of the concept of the formation of a unique glassy structure in special multicomponent alloys with the three component rules.

Soft Magnetic Bulk Glassy Alloy Synthesized by Flux Melting and Water Quenching

2007 ◽  
Vol 539-543 ◽  
pp. 1921-1925 ◽  
Author(s):  
Akihiro Makino ◽  
Teruo Bitoh ◽  
Akihisa Inoue ◽  
A. Lindsay Greer
Keyword(s):  
Cooling Rate ◽  
Glassy Alloy ◽  
Glass Forming Ability ◽  
Water Quenching ◽  
Soft Magnetic ◽  
Glass Forming ◽  
Large Bulk ◽  
Mold Casting ◽  
Molten Flux ◽  
Bulk Glassy Alloy

The flux treatment was applied to increase the glass-forming ability of a glassy [(Fe0.5Co0.5)0.75B0.20Si0.05]96Nb4 alloy. The large bulk glassy specimen with diameter of 7.7 mm was prepared by water quenching the melt immersed in the molten flux of B2O3. The diameter of the specimens is approximately 1.5 times as large as the previous result, even though the cooling rate of copper mold casting should be much higher than that of water quenching. The critical cooling rate for a glassy phase is 150 - 170 K/s, which is much slower than 500 K/s without the flux treatment. The flux treatment improves the glass-forming ability by cleaning the molten metal where heterogeneous nucleation is difficult to take place.

Development of Ni-Zr-Nb-Al-M(=Ta,Ti,Y) Metallic Glass

2005 ◽  
Vol 475-479 ◽  
pp. 3435-3438 ◽  
Author(s):  
J.H. Na ◽  
K.H. Han ◽  
Won Tae Kim ◽  
Do Hyang Kim
Keyword(s):  
Metallic Glass ◽  
Continuous Heating ◽  
Liquid Region ◽  
Copper Mold ◽  
Casting Method ◽  
X Ray ◽  
Glass Forming ◽  
Copper Mold Casting ◽  
Transmission Electron ◽  
Mold Casting

The effects of Ta, Ti and Y addition substituting Zr in the Ni-Zr-Nb-Al metallic glass alloys have been investigated by using thermal analysis, X-ray diffractometry and transmission electron microscopy. Partial replacements of Zr with M(=Ta, Ti, Y) in Ni61Zr28Nb7Al4 alloy significantly enhance the glass forming ability and enlarge the undercooled liquid region during continuous heating of glassy ribbons. Fully glassy rods with the diameter of up to 2 mm can be fabricated by a copper mold casting method.

Sign in / Sign up

Export Citation Format

Share Document