Effects of growth rate and temperature gradient on the microstructure parameters in the directionally solidified succinonitrile–7.5wt.% carbon tetrabromide alloy

2008 ◽  
Vol 202 (1-3) ◽  
pp. 145-155 ◽  
Author(s):  
N. Maraşlı ◽  
K. Keşlioğlu ◽  
B. Arslan ◽  
H. Kaya ◽  
E. Çadırlı
Keyword(s):  
Growth Rate ◽  
Temperature Gradient ◽  
Directionally Solidified ◽  
Carbon Tetrabromide ◽  
Microstructure Parameters

Morphological Characteristics of W-Nanowires after Selective Etching

2014 ◽  
Vol 1004-1005 ◽  
pp. 24-27
Author(s):  
Wen Jia Wang ◽  
Zhi Long Zhao ◽  
Ming Tang ◽  
Jian Jun Gao
Keyword(s):  
Growth Rate ◽  
Temperature Gradient ◽  
Directional Solidification ◽  
Morphological Characteristics ◽  
Selective Dissolution ◽  
Stability Diagram ◽  
Selective Etching ◽  
Directionally Solidified ◽  
Solidification Furnace ◽  
Nial Matrix

An eutectic NiAl–1.5 at.% W alloy prepared by using directionally solidified (DS)was employed as a source for producing W-nanowires. Several growth rate of 8,15,25/s was respectively used at a temperature gradient of ~240 K/cm in a Bridgman-type directional solidification furnace. A combined stability diagram was applied to predict proper conditions for the selective dissolution of NiAl matrix to get W-wires. Etching in a mixture of HCl:H2O2released parallel aligned W-nanowires with a wire diameter of ~500 nm. Different morphologies, such as nanobelts, lotus-shaped, conical of W-nanowires are obtained at the different conditions.

INFLUENCE OF THE SOLIDIFICATION PARAMETERS ON DENDRITIC MICROSTRUCTURES IN UNSTEADY-STATE DIRECTIONALLY SOLIDIFIED OF LEAD–ANTIMONY ALLOY

2010 ◽  
Vol 17 (05n06) ◽  
pp. 477-486 ◽  
Author(s):  
M. ŞAHIN ◽  
E. ÇADIRLI ◽  
H. KAYA
Keyword(s):  
Growth Rate ◽  
Primary Dendrite ◽  
Linear Regression Analysis ◽  
Theoretical Models ◽  
Directionally Solidified ◽  
Constant Growth Rate ◽  
Dendrite Arm Spacing ◽  
Primary Dendrite Arm Spacing ◽  
Microstructure Parameters ◽  
Solidification Parameters

Pb-9.3wt.%Sb alloy was directionally solidified upwards under argon atmosphere under the two conditions; with different temperature gradients, (G = 0.93–3.67 K/mm) at a constant growth rate (V = 17.50 μm/s) and with different growth rates (V = 8.30–497.00 μm/s) at a constant (G = 3.67 K/mm) in a Bridgman furnace. The dependence of characteristic microstructure parameters such as primary dendrite arm spacing (λ1), secondary dendrite arm spacing (λ2) and dendrite tip radius (R) on the growth rate (V) and the temperature gradient (G) were determined by using a linear regression analysis. A detailed analysis of microstructure were also made and compared with the theoretical models and similar experimental works on dendritic solidification in the literature.

INFLUENCE OF GROWTH RATE ON MICROSTRUCTURE AND MICROINDENTATION HARDNESS OF DIRECTIONALLY SOLIDIFIED TIN–CADMIUM EUTECTIC ALLOY

2009 ◽  
Vol 16 (02) ◽  
pp. 191-201 ◽  
Author(s):  
E. ÇADIRLI ◽  
H. KAYA ◽  
M. GÜNDÜZ
Keyword(s):  
Growth Rate ◽  
Temperature Gradient ◽  
Directional Solidification ◽  
Constant Temperature ◽  
Eutectic Alloy ◽  
Directionally Solidified ◽  
Constant Temperature Gradient ◽  
Microindentation Hardness ◽  
Solidification Furnace ◽  
Eutectic Melt

Sn – Cd eutectic melt was first obtained in a hot filling furnace and then directionally solidified upward with different growth rate ranges (8.1–165 μm/s) at a constant temperature gradient G (4.35 K/mm) in the Bridgman-type directional solidification furnace. The lamellar spacings (λ) were measured from both transverse and longitudinal sections of the samples. The influence of the growth rate (V) on lamellar spacings (λ) and undercoolings (Δ T) was analyzed. λ2V, ΔTλ and ΔTV-0.5 values were determined by using λ,ΔT and V values. Microindentation hardness (HV) was measured from both transverse and longitudinal sections of the specimens. HV values increase with the increasing values of V but decrease with increasing λ values. λ-V, λ - ΔT and λ2V results have been compared with the Jackson–Hunt eutectic model and similar experimental results, HV - V and HV - λ results were also compared with the previous work.

Influence of Growth Rate on the Solute Distribution of Directionally Solidified Cu-Ag-Zr Alloy

2011 ◽  
Vol 275 ◽  
pp. 192-195
Author(s):  
Bok Hyun Kang ◽  
Woo Hyun Lee ◽  
Ki Young Kim ◽  
Hoon Cho ◽  
Jae Soo Noh
Keyword(s):  
Electrical Conductivity ◽  
Growth Rate ◽  
Temperature Gradient ◽  
Constant Temperature ◽  
Vickers Hardness ◽  
Growth Rates ◽  
Back Diffusion ◽  
Directionally Solidified ◽  
Constant Temperature Gradient ◽  
Zr Alloy

Cu-2wt.Ag-2wt.%Zr alloy was directionally solidified with different growth rates(V=10-200 um/s) at a constant temperature gradient(G=3.1 K/mm) in a modified Bridgman furnace. The influence of growth rate was investigated by observing the microstructure and measuring the solutes’ compositions within the Cu-matrix and dendrite boundaries. The experimental results show that increasing the growth rate, decreased both the primary and secondary arm spacing and increased micro-Vickers hardness. The solutes’ concentration also increased as a result of the back diffusion caused by a decreasing growth rate. The electrical conductivity depends on the solutes’ distribution.

Dependency of microstructure parameters and microhardness on the temperature gradient for directionally solidified Ti–49Al alloy

2011 ◽  
Vol 130 (3) ◽  
pp. 1232-1238 ◽  
Author(s):  
Jianglei Fan ◽  
Xinzhong Li ◽  
Yanqing Su ◽  
Ruirun Chen ◽  
Jingjie Guo ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Directionally Solidified ◽  
Microstructure Parameters

Effect of growth rate on microstructure parameters and microhardness in directionally solidified Ti–49Al alloy

2012 ◽  
Vol 34 ◽  
pp. 552-558 ◽  
Author(s):  
Jianglei Fan ◽  
Xinzhong Li ◽  
Yanqing Su ◽  
Jingjie Guo ◽  
Hengzhi Fu
Keyword(s):  
Growth Rate ◽  
Directionally Solidified ◽  
Microstructure Parameters
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