Critical cooling rate for Fe48Cr15Mo14Y2C15B6 bulk metallic glass formation

2006 ◽  
Vol 14 (8-9) ◽  
pp. 898-902 ◽  
Author(s):  
K. Hildal ◽  
N. Sekido ◽  
J.H. Perepezko
Keyword(s):  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Glass Formation ◽  
Critical Cooling Rate

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.

Atomistic Theory of Bulk Metallic Glass Formation

2002 ◽  
Vol 754 ◽  
Author(s):  
T. Egami
Keyword(s):  
Glass Transition ◽  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Glass Formation ◽  
Dynamics Simulation ◽  
Necessary Condition ◽  
Atomic Transport ◽  
Strong Repulsion ◽  
First Time

ABSTRACTBulk metallic glass can be formed only when the critical cooling rate for glass formation is reduced to 100–2 K/sec. However, a cooling rate achievable with molecular dynamics simulation is higher by many orders of magnitude, so the gap has to be abridged by analytical theories. We propose a theory of bulk metallic glass formation based upon our early theories of glass formation composition. The critical concepts include the idea of local glass transition, distributed local glass transition temperatures and coincident local fluctuation for atomic transport. Strong repulsion between small atoms was recognized for the first time as the necessary condition for bulk glass formation.

scholarly journals A new model for calculating the critical cooling rate of bulk metallic glass under non-isothermal condition

2006 ◽  
Vol 55 (4) ◽  
pp. 1953
Author(s):  
Wang Zhen-Yu ◽  
Yang Yuan-Sheng ◽  
Tong Wen-Hui ◽  
Li Hui-Qiang ◽  
Hu Zhuang-Qi
Keyword(s):  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Isothermal Condition ◽  
New Model ◽  
Critical Cooling Rate

The influence of the cooling rate on bulk metallic glass formation in Mg80Cu15Y5 and Mg80Cu10Y10

2010 ◽  
Vol 45 (23) ◽  
pp. 6365-6373 ◽  
Author(s):  
M. Regev ◽  
H. Rosenson ◽  
Z. Koren ◽  
A. Katz-Demyanetz
Keyword(s):  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Glass Formation

A deep eutectic point in quaternary Zr–Ti–Ni–Cu system and bulk metallic glass formation near the eutectic point

2012 ◽  
Vol 21 (1) ◽  
pp. 67-74 ◽  
Author(s):  
D.M. Lee ◽  
J.H. Sun ◽  
D.H. Kang ◽  
S.Y. Shin ◽  
G. Welsch ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Formation ◽  
Eutectic Point

Effect of cooling rate on the bending plasticity of Zr55Al10Ni5Cu30 bulk metallic glass

2012 ◽  
Vol 527 ◽  
pp. 36-39 ◽  
Author(s):  
Y. Hu ◽  
H.H. Yan ◽  
T. Lin ◽  
J.F. Li ◽  
Y.H. Zhou
Keyword(s):  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass

scholarly journals Virtual Development of Process Parameters for Bulk Metallic Glass Formation in Laser-Based Powder Bed Fusion

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 450
Author(s):  
Johan Lindwall ◽  
Andreas Lundbäck ◽  
Jithin James Marattukalam ◽  
Anders Ericsson
Keyword(s):  
Additive Manufacturing ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Process Parameters ◽  
Glass Formation ◽  
Laser Power ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Scanning Strategies ◽  
Hatch Spacing

The development of process parameters and scanning strategies for bulk metallic glass formation during additive manufacturing is time-consuming and costly. It typically involves trials with varying settings and destructive testing to evaluate the final phase structure of the experimental samples. In this study, we present an alternative method by modelling to predict the influence of the process parameters on the crystalline phase evolution during laser-based powder bed fusion (PBF-LB). The methodology is demonstrated by performing simulations, varying the following parameters: laser power, hatch spacing and hatch length. The results are compared in terms of crystalline volume fraction, crystal number density and mean crystal radius after scanning five consecutive layers. The result from the simulation shows an identical trend for the predicted crystalline phase fraction compared to the experimental estimates. It is shown that a low laser power, large hatch spacing and long hatch lengths are beneficial for glass formation during PBF-LB. The absolute values show an offset though, over-predicted by the numerical model. The method can indicate favourable parameter settings and be a complementary tool in the development of scanning strategies and processing parameters for additive manufacturing of bulk metallic glass.

NANOSCALE DIMPLES AND PERIODIC CORRUGATIONS ON FRACTURE SURFACE OF Zr-BASED BULK METALLIC GLASS COMPOSITE

2019 ◽  
Vol 26 (08) ◽  
pp. 1950037
Author(s):  
BO SHI ◽  
SHIYU LUAN ◽  
PEIPENG JIN
Keyword(s):  
Fracture Surface ◽  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Crystallization Behavior ◽  
Glass Composite ◽  
Bulk Metallic Glass Composite

Nanoscale dimples and periodic corrugations are observed on the fracture surface of Zr-based bulk metallic glass composite (BMGC). The nanoscale periodic corrugations display a curved shape, which is different from that observed in previous works. In addition, the crystallization behavior of [Formula: see text][Formula: see text][Formula: see text][Formula: see text] BMG was investigated. The second crystallization event of Zr-Cu-Ni-Al BMG can be controlled by annealing or tuning cooling rate. The in situ Zr-based BMGC was prepared via lowering cooling rate. The Zr-based BMGC displays completely brittleness.

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