Numerical Model of Thermal Field Developed in Fe67Cr4Mo4Ga4P12B5C4 Bulk Amorphous Alloy Processing

2016 ◽  
Vol 254 ◽  
pp. 249-254
Author(s):  
Bogdan Radu ◽  
Dragoş Buzdugan ◽  
Cosmin Codrean ◽  
Viorel Aurel Şerban ◽  
George Vișan
Keyword(s):  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Thermal Field ◽  
Good Control ◽  
Experimental Tests ◽  
Glass Forming Ability ◽  
Bulk Amorphous Alloy ◽  
Bulk Amorphous Alloys ◽  
Glass Forming

Metallic amorphous materials were developed during 80’s as new materials, with very interesting industrial properties (heat conductivity, magnetic properties, fusion temperature, corrosion resistance, etc.). Technology to obtain these materials, based on very rapid cooling of a melted alloy with glass forming ability, has limitations for the dimensions of the products that can be obtained with amorphous structure (thickness has to be very thin), which can be overpassed by development of bulk amorphous alloys with high glass forming ability and good control of the cooling speed. Numerical modeling of thermal field during ultra-high cooling, developed in researches presented in this paper, allows researchers to estimate the results of applying in reality certain cooling conditions. This model will help developers of bulk amorphous alloys in checking if are ensured conditions to obtain an amorphous alloy with fewer experimental tests, less time and low expenses.

Design of a bulk amorphous alloy containing Cu–Zr with simultaneous improvement in glass-forming ability and plasticity

2007 ◽  
Vol 22 (2) ◽  
pp. 486-492 ◽  
Author(s):  
Seok-Woo Lee ◽  
Sang-Chul Lee ◽  
Yu-Chan Kim ◽  
E. Fleury ◽  
Jae-Chul Lee
Keyword(s):  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
Glass Forming Ability ◽  
Bulk Amorphous Alloy ◽  
Mixing Enthalpy ◽  
High Plasticity ◽  
Atomic Packing ◽  
Bulk Amorphous Alloys ◽  
Glass Forming ◽  
Enthalpy Difference

We synthesized bulk amorphous alloy systems of Cu43Zr43Al7X7 (X = Be, Ag; numbers indicate at.%), with the objective of simultaneously enhancing the glass-forming ability (GFA) and the plasticity. The alloys not only exhibit high plasticity (∼7%, ∼8%), but also possess enhanced GFA (alloys with 12 and 8 mm diameter). The possible mechanisms underlying this enhanced GFA and plasticity exhibited by these alloys are discussed based on the atomic-packing state and atomistic-scale compositional separation associated with the mixing enthalpy difference. A strategy for designing bulk amorphous alloys with simultaneous improvement in the GFA and the plasticity is proposed from the viewpoint of atomic-packing state and atomistic-scale phase separation.

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.

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.

scholarly journals Crystallization Behavior of Al70Fe12.5V12.5Nb5 Amorphous Alloy Formed by Mechanical Alloying

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 383 ◽  
Author(s):  
Xuan Liu ◽  
Xingfu Wang ◽  
Yongli Si ◽  
Xiaokang Zhong ◽  
Fusheng Han
Keyword(s):  
Amorphous Alloy ◽  
Mechanical Alloying ◽  
Amorphous Alloys ◽  
Crystallization Behavior ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Glass Forming Ability ◽  
Liquid Region ◽  
Application Field ◽  
Glass Forming

In this study, the formation and crystallization of the Al70Fe12.5V12.5Nb5 amorphous alloys has been investigated. The addition of Nb enhances the supercooled liquid region and glass forming ability of the Al-Fe-V amorphous alloys. The Al70Fe12.5V12.5Nb5 amorphous alloy exhibits two distinct crystallization steps and a large supercooled liquid region at more than 100 K. Kissinger and Ozawa analyses showed that the two activation energies for crystallization (Ex) were estimated to be 366.3 ± 23.9 and 380.5 ± 23.9 kJ/mol. Large supercooled liquid regions are expected to gain an application field of Al-based amorphous alloys.

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.

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

scholarly journals Design and characterization of novel zirconium-based amorphous alloys containing scandium for biomedical application

2021 ◽  
Author(s):  
Hai-Po Cui ◽  
Wei-Dong Zhang ◽  
Cheng-Li Song
Keyword(s):  
Amorphous Alloy ◽  
Acid Solution ◽  
Amorphous Alloys ◽  
Biomedical Application ◽  
Glass Forming Ability ◽  
Atomic Fraction ◽  
Glass Forming ◽  
Surgical Devices ◽  
Average Corrosion Rate

Abstract In this work, (Zr55Cu30Al10Ni5)100−xScx (x = 0, 0.5, 1.0, and 1.5) amorphous alloys were fabricated through steel die casting. The effects of scandium on the properties of zirconium-based amorphous alloys have been studied. The results show that the glass-forming ability of amorphous alloys increases at first and then decreases with the increase of Sc content. The highest glass-forming ability is obtained when the atomic fraction of Sc is 0.5%, which enables the production of 2-mm-thick amorphous alloy ingots. Meanwhile, the thermal stability and mechanical properties of the alloy are optimised with the atomic fraction of Sc of 1.0%. In addition, by adding an appropriate amount of Sc, the corrosion resistance of Zr–Cu–Al–Ni alloys is enhanced, particularly in the acid solution. The lowest average corrosion rate for samples in acid solution is obtained with the alloy containing atomic fraction of Sc of 1.0%. Therefore, results of this study indicate that the Zr-based amorphous alloy containing scandium has the potential for manufacturing fracture internal fixation or surgical devices.

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