Measurements of microhardness during transient horizontal directional solidification of Al-Rich Al-Cu alloys: Effect of thermal parameters, primary dendrite arm spacing and Al2Cu intermetallic phase

2015 ◽  
Vol 21 (3) ◽  
pp. 429-439 ◽  
Author(s):  
André Santos Barros ◽  
Igor Alexsander Magno ◽  
Fabrício Andrade Souza ◽  
Carlos Alberto Mota ◽  
Antonio Luciano Moreira ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Primary Dendrite ◽  
Intermetallic Phase ◽  
Thermal Parameters ◽  
Dendrite Arm Spacing ◽  
Cu Alloys ◽  
Primary Dendrite Arm Spacing

scholarly journals The effect of Mg content on microstructure in Al‐12wt. %Zn‐x Mg Alloy

2009 ◽  
Vol 7 (02) ◽  
Author(s):  
M. A. Suárez ◽  
B. - Campillo ◽  
R. A. Rodrí­guez-Diaz ◽  
O. Alvarez-Fregoso ◽  
J. A. Juárez-Islas
Keyword(s):  
Temperature Gradient ◽  
Solidification Front ◽  
Primary Dendrite ◽  
Intermetallic Phase ◽  
Theoretical Models ◽  
Front Velocity ◽  
Volume Percentage ◽  
Dendrite Arm Spacing ◽  
Primary Dendrite Arm Spacing ◽  
Solidification Parameters

The effect of adding different Mg contents to an Al‐12wt.%Zn master alloy was experimentally investigated. The Al‐Zn‐Mg alloys were unidirectionally solidified as a function of solidification parameters, temperature gradient GL, solidification front velocity V, and composition C0. The alloys were solidified with a constant temperature gradient (GL=2500K/m) in the solidification front velocity range from 4X10‐6m/s to 1.7X10‐4m/s. The resulting microstructure was characterized to investigate the effect of solidification front velocities and composition on primary dendrite arm spacing, volume percentage of eutectic in interdendritic regions and τ intermetallic phase in α‐Al matrix. Theoretical models for the dendrite arm spacing and dendrite tip radius have been compared with the experimental observations.

Correlation between Thermal Parameters, Primary Dendrite Arm Spacing and Microhardness on a Directionally Solidified Ternary Al-6wt%Cu-8wt%Si Alloy

2015 ◽  
Vol 365 ◽  
pp. 136-141
Author(s):  
O.L. Rocha ◽  
A.L. Moreira ◽  
T.A. Costa ◽  
J.M.D. Filho ◽  
S.L. Paula ◽  
...  
Keyword(s):  
Experimental Study ◽  
Primary Dendrite ◽  
Thermal Parameters ◽  
Heat Extraction ◽  
Directionally Solidified ◽  
Power Functions ◽  
Microstructural Parameters ◽  
Dendrite Arm Spacing ◽  
Primary Dendrite Arm Spacing ◽  
Analytical Power

The objective of this paper is to present an experimental study that aimed to establish correlations between primary dendrite spacing (λ1) and microhardness of a ternary Al-6wt%Cu-8wt%Si alloy solidified under transient heat extraction, using a horizontal unidirectional water-cooled solidification device. To examine the microstructural evolution, solidification thermal parameters (growth rate and cooling rate - VLand TR, respectively) were calculated through the application of an experimental method and were then correlated with λ1using analytical power functions laws. The correlation between microstructural parameters and the measured microhardness values are presented in the forms of power and Hall-Petch types of equations. The analysis of the microstructure of the investigated alloy indicated that the increasing of TRand VLreduced the primary dendrite arm spacing, increasing the microhardness.

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