Solidification behavior, glass forming ability and thermal characteristics of soft magnetic Fe–Co–B–Si–Nb–Cu bulk amorphous alloys

2011 ◽  
Vol 19 (9) ◽  
pp. 1330-1337 ◽  
Author(s):  
Muratahan Aykol ◽  
M. Vedat Akdeniz ◽  
Amdulla O. Mekhrabov
Keyword(s):  
Amorphous Alloys ◽  
Thermal Characteristics ◽  
Glass Forming Ability ◽  
Solidification Behavior ◽  
Soft Magnetic ◽  
Bulk Amorphous Alloys ◽  
Glass Forming

Effect of Neodymium on the Glass-Forming Ability and Magnetic Properties of Fe-Based Bulk Amorphous Alloys

2015 ◽  
Vol 1120-1121 ◽  
pp. 440-445
Author(s):  
Hua Man
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Glass Forming Ability ◽  
High Thermal Stability ◽  
Bulk Amorphous Alloy ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Crystallization Peak ◽  
Bulk Amorphous Alloys ◽  
Glass Forming

The glass forming ability and magnetic properties were investigated for adding neodymium to the Fe71-xNb4B25Ndx (x=0, 3, 5, 7,10) alloys prepared by copper suction casting. It was found that proper neodymium (x=5~10 at.%) could improve glass forming ability of Fe-Nb-B alloys effectively. Bulk amorphous Fe66Nd5B25Nb4 and Fe64Nd7B25Nb4 samples were obtained and presented high thermal stability and good soft magnetic properties. The value of activation energy of the first crystallization peak for the bulk amorphous alloy Fe64Nd7B25Nb4 is 683 kJ/mol.

Formation, and mechanical and magnetic properties of bulk ferromagnetic Fe-Nb-B-Y-(Zr, Co) alloys

2006 ◽  
Vol 21 (4) ◽  
pp. 1019-1024 ◽  
Author(s):  
J.M. Park ◽  
J.S. Park ◽  
D.H. Kim ◽  
J-H. Kim ◽  
E. Fleury
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Amorphous Alloys ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Partial Replacement ◽  
Soft Magnetic ◽  
Glass Forming ◽  
Mold Casting ◽  
Co Alloys

Fe element was partially substituted by Zr and Co in an attempt to enhance the glass-forming ability, and mechanical and soft magnetic properties of Fe74-xNb6B17Y3(Zr, Co)x (x = 3, 5, 8) amorphous alloys. Both partial replacements resulted in the enhancement of the glass-forming ability, and 3-mm diameter rods with a fully amorphous structure were prepared by a copper mold casting method. Zr and Co containing Fe-based bulk amorphous alloys exhibited high compressive fracture strength of about 4 and 3.5 GPa, respectively. However, Zr and Co induced different effects on the magnetic properties. Whereas the partial replacement of Fe by Zr was found to decrease dramatically the saturation magnetization, the partial replacement of Fe by Co provided an increase of about 25% of the saturation magnetization.

scholarly journals Survey of BGFA Criteria for the Cu-Based Bulk Amorphous Alloys

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
D. Janovszky ◽  
K. Tomolya ◽  
M. Sveda ◽  
A. Roosz
Keyword(s):  
Amorphous Alloys ◽  
Critical Thickness ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
The Real ◽  
Bulk Amorphous Alloys ◽  
Glass Forming ◽  
Versus Plot ◽  
Mismatch Condition

To verify the effect of composition on the bulk glass forming ability (BGFA) of Cu-based alloys, properties have been collected from the literature (~100 papers, more than 200 alloys). Surveying the BGFA criteria published so far, it has been found that the atomic mismatch condition of Egami-Waseda is fulfilled for all the Cu-based BGFAs, the value being above 0,3. The Zhang Bangwei criterion could be applied for the binary Cu-based alloys. The Miracle and Senkov criteria do not necessarily apply for Cu based bulk amorphous alloys. The critical thickness versus plot of Lu and Liu extrapolates to , somewhat higher than the 0.33 value found in other BGFA alloys. The Park and Kim parameter correlates rather poorly with the critical thickness for Cu based alloys. The Cheney and Vecchino parameter is a good indicator to find the best glass former if it is possible to calculate the exact liquids projection. In 2009 Xiu-lin and Pan defined a new parameter which correlates a bit better with the critical thickness. Based on this survey it is still very difficult to find one parameter in order to characterize the real GFA without an unrealized mechanism of crystallization.

Mg–Ca–Zn Bulk Metallic Glasses with High Strength and Significant Ductility

2005 ◽  
Vol 20 (8) ◽  
pp. 1935-1938 ◽  
Author(s):  
X. Gu ◽  
G.J. Shiflet ◽  
F.Q. Guo ◽  
S.J. Poon
Keyword(s):  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Mass Density ◽  
High Strength ◽  
Light Metal ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
Bulk Amorphous Alloys ◽  
Specific Strength ◽  
Glass Forming

The development of Mg–Ca–Zn metallic glasses with improved bulk glass forming ability, high strength, and significant ductility is reported. A typical size of at least 3–4 mm amorphous samples can be prepared using conventional casting techniques. By varying the composition, the mass density of these light metal based bulk amorphous alloys ranges from 2.0 to 3.0 g/cm3. The typical measured microhardness is 2.16 GPa, corresponding to a fracture strength of about 700 MPa and specific strength of around 250–300 MPa cm3/g. Unlike other Mg- or Ca-based metallic glasses, the present Mg–Ca–Zn amorphous alloys show significant ductility.

B23-P-04High glass forming ability Fe-based soft magnetic amorphous alloys

Microscopy ◽  
2015 ◽  
Vol 64 (suppl 1) ◽  
pp. i113.2-i113
Author(s):  
C. N. Kuo ◽  
Y. H. Chen ◽  
T. Y. Wei ◽  
Y.L. Su ◽  
J. C. Huang
Keyword(s):  
Amorphous Alloys ◽  
Glass Forming Ability ◽  
Soft Magnetic ◽  
Glass Forming ◽  
Soft Magnetic Amorphous Alloys

Predicted Optimum Composition for the Glass-Forming Ability of Bulk Amorphous Alloys: Application to Cu–Zr–Al

2012 ◽  
Vol 3 (21) ◽  
pp. 3143-3148 ◽  
Author(s):  
Qi An ◽  
Konrad Samwer ◽  
William A. Goddard ◽  
William L. Johnson ◽  
Andres Jaramillo-Botero ◽  
...  
Keyword(s):  
Amorphous Alloys ◽  
Glass Forming Ability ◽  
Optimum Composition ◽  
Bulk Amorphous Alloys ◽  
Glass Forming

Bulk Glass Formation in an Fe-Based Fe–Y–Zr–M (M = Cr, Co, Al)–Mo–B System

2004 ◽  
Vol 19 (3) ◽  
pp. 921-929 ◽  
Author(s):  
Z.P. Lu ◽  
C.T. Liu ◽  
C.A. Carmichael ◽  
W.D. Porter ◽  
S.C. Deevi
Keyword(s):  
Metallic Glasses ◽  
Glass Formation ◽  
Amorphous Alloys ◽  
High Strength ◽  
Supercooled Liquid ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
Bulk Amorphous Alloys ◽  
Glass Forming ◽  
Hardness Values

Several new bulk metallic glasses based on Fe–Y–Zr–(Co, Cr, Al)–Mo–B, which have a glass-forming ability superior to the best composition Fe61Zr10Co7Mo5W2B15 reported recently, have been successfully developed. The as-cast bulk amorphous alloys showed a distinctly high thermal stability with glass-transition temperatures above 900 K, supercooled liquid regions above 60 K, and high strength with Vickers hardness values larger than HV 1200. The suppression of the growth of primary phases in the molten liquids and the resultant low liquidus temperatures were found to be responsible for the superior glass-forming ability in these new alloys. It was found that the addition of 2% Y not only facilitated bulk glass formation, but the neutralizing effect of Y with oxygen in the molten liquids also improved the manufacturability of these amorphous alloys.

Effect of yttrium on the glass-forming ability of Fe–Cr–Mo–C–B bulk amorphous alloys

2007 ◽  
Vol 427 (1-2) ◽  
pp. 190-193 ◽  
Author(s):  
Qingjun Chen ◽  
Deliang Zhang ◽  
Jun Shen ◽  
Hongbo Fan ◽  
Jianfei Sun
Keyword(s):  
Amorphous Alloys ◽  
Glass Forming Ability ◽  
Bulk Amorphous Alloys ◽  
Glass Forming
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