Growth of Equiaxed Dendrite in Al-20wt.%Cu Alloy by Synchrotron X-Ray Radiography

2016 ◽  
Vol 850 ◽  
pp. 180-185
Author(s):  
Fei Cao ◽  
Fen Fen Yang ◽  
Cun Lei Zou ◽  
Hui Jun Kang ◽  
Ya Nan Fu ◽  
...  
Keyword(s):  
Primary Dendrite ◽  
Equiaxed Dendrite ◽  
X Ray ◽  
Cu Alloy ◽  
Solute Interaction ◽  
Dendrites Growth ◽  
Early Growth Phase ◽  
Main Factor ◽  
Equiaxed Dendrites

Synchrotron X-ray radiography was used to in-situ study the growth of equiaxed dendrite during the solidification of Al-20 wt.% Cu alloy. Equiaxed dendrites with two different morphologies were formed in nearly isothermal conditions. The image processing was used to improve the image quality. The time evolution of the primary dendrite arm length and the corresponding growth rates were analyzed. The experimental results indicated that the solute interaction was the main factor to influence the equiaxed dendrites growth. Besides, the rotation and floating of the dendrites were also observed during the early growth phase.

scholarly journals Analysis of an Equiaxed Dendrite Growth Model with Comparisons to In-Situ Results of Equiaxed Dendritic Growth in an Al-Ge Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 1359-1362 ◽  
Author(s):  
Shaun McFadden ◽  
Paul L. Schaffer ◽  
Ragnvald H. Mathiesen ◽  
David J. Browne
Keyword(s):  
Growth Model ◽  
Dendritic Growth ◽  
Infinite Volume ◽  
Grain Refiner ◽  
Equiaxed Dendrite ◽  
X Ray ◽  
Temperature Trends ◽  
Dendrite Growth Model ◽  
Equiaxed Dendrites

The Lipton Glicksman Kurz (LGK) growth model is commonly used to predict growth rates for equiaxed dendrites in solidifying mushy zones. However, the original LGK method treats an isolated dendrite growing in an infinite volume of liquid. In an equiaxed mushy zone, with multiple nucleation events, thermal and solutal interactions take place between the equiaxed dendrites. A modified version of the LGK model was developed that allows for measurement of the solute build-up ahead of the dendrites. To investigate the validity of the model, comparisons are made with results obtained from in-situ synchrotron X-ray videomicroscopy of solidification in a Bridgman furnace of an Al-12wt.%Ge alloy inoculated with Al-Ti-B grain refiner. Comparisons between the original LGK and modified LGK models are presented for discussion. The modified LGK model shows realistic tip temperature trends.

scholarly journals Early precipitation during cooling of an Al-Zn-Mg-Cu alloy revealed by in situ small angle X-ray scattering

2014 ◽  
Vol 105 (10) ◽  
pp. 101908 ◽  
Author(s):  
P. Schloth ◽  
J. N. Wagner ◽  
J. L. Fife ◽  
A. Menzel ◽  
J.-M. Drezet ◽  
...  
Keyword(s):  
Small Angle ◽  
X Ray ◽  
Cu Alloy ◽  
X Ray Scattering ◽  
Ray Scattering

High Speed Imaging Study of the Dynamics of Ultrasonic Bubbles at a Liquid-Solid Interface

2013 ◽  
Vol 765 ◽  
pp. 230-234 ◽  
Author(s):  
Dong Yue Tan ◽  
Jia Wei Mi
Keyword(s):  
High Speed ◽  
Primary Dendrite ◽  
Imaging Study ◽  
High Speed Imaging ◽  
X Ray ◽  
Dendrite Fragmentation ◽  
X Ray Imaging ◽  
Wave Induced ◽  
Photon Source

High speed imaging, including the ultrafast synchrotron X-ray imaging facility at the beamline 32-ID-B of the Advanced Photon Source (APS), was used to study in-situ (1) the dynamics of ultrasonic bubbles inside a water suspension with an acoustic field of varied pressure; and (2) the interaction of a pulsing bubble at a primary dendrite arm tip inside a succinonitrile-1wt% camphor organic transparent alloy. A simple finite element based model was developed to simulate the stress distribution inside the dendrite due to the pulsing of the ultrasonic bubble, providing more evidence for understanding quantitatively the ultrasonic wave induced dendrite fragmentation phenomenon.

Combined in situ X-ray radiographic observations and post-solidification metallographic characterisation of eutectic transformations in Al–Cu alloy systems

2013 ◽  
Vol 61 (12) ◽  
pp. 4559-4571 ◽  
Author(s):  
A.G. Murphy ◽  
D.J. Browne ◽  
W.U. Mirihanage ◽  
R.H. Mathiesen
Keyword(s):  
X Ray ◽  
Cu Alloy ◽  
Alloy Systems

In Situ X-Ray Microtomography Investigation of the Deformation Mechanisms of Al-Cu Alloys in the Semi-Solid State

2009 ◽  
Vol 618-619 ◽  
pp. 275-278 ◽  
Author(s):  
Sofiane Terzi ◽  
Luc Salvo ◽  
Michel Suéry ◽  
Jérôme Adrien ◽  
Éric Maire ◽  
...  
Keyword(s):  
Solid State ◽  
Pore Formation ◽  
Deformation Behaviour ◽  
Liquid Films ◽  
Deformation Mechanisms ◽  
X Ray ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Semi Solid

This paper is concerned with an investigation of the deformation behaviour of an Al-Cu alloy during tensile testing in the semi-solid state. It was carried out by fast in-situ X-Ray microtomography at ESRF, Grenoble. Deformation was performed at constant velocity, which was chosen to be small enough so as not to affect the acquisition of the images. It is observed that deformation is accompanied, initially, by some liquid flow from the adjacent regions towards the deformed zone. Then pores form in the liquid films and grow until they occupy a significant part of the cross section of the specimen. Quantification of this phenomenon was carried out thus leading to a better understanding of pore formation in semi-solid mixtures.

In-situ three-dimensional microstructural investigation of solidification of an Al-Cu alloy by ultrafast x-ray microtomography

2005 ◽  
Vol 36 (6) ◽  
pp. 1515-1523 ◽  
Author(s):  
Olivire Ludwig ◽  
Marco Dimichiel ◽  
Luc Salvo ◽  
Michel Suéry ◽  
Peter Falus
Keyword(s):  
Three Dimensional ◽  
Microstructural Investigation ◽  
X Ray ◽  
Cu Alloy
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