The effects of temperature gradient and growth rate on the microstructure of directionally solidified Sn–3.5Ag eutectic solder

2011 ◽  
Vol 23 (2) ◽  
pp. 484-492 ◽  
Author(s):  
Mevlüt Şahin ◽  
Emin Çadirli
Keyword(s):  
Growth Rate ◽  
Temperature Gradient ◽  
Directionally Solidified ◽  
Eutectic Solder ◽  
Effects Of Temperature

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 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.

scholarly journals Directional solidification of Zn-Al-Cu eutectic alloy by the vertical Bridgman method

2015 ◽  
Vol 51 (1) ◽  
pp. 67-72 ◽  
Author(s):  
U. Büyük ◽  
S. Engin ◽  
N. Maraşlı
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Temperature Gradient ◽  
Eutectic Alloy ◽  
Temperature Gradients ◽  
Directionally Solidified ◽  
Constant Growth Rate ◽  
Microstructure And Mechanical Properties ◽  
Vertical Bridgman ◽  
Constant Growth

In the present work, the effect of growth rate and temperature gradient on microstructure and mechanical properties of Zn-7wt.%Al-4wt.%Cu eutectic alloy has been investigated. Alloys prepared under steady-state conditions by vacuumed hot filing furnace. Then, the alloys were directionally solidified upward with different growth rates (V=11.62-230.77 mm/s) at a constant temperature gradient (G=7.17 K/mm) and with different temperature gradients (G=7.17-11.04 K/mm) at a constant growth rate (V=11.62 mm/s) by a Bridgman furnace. The microstructures were observed to be lamellae of Zn, Al and broken lamellae CuZn4 phases from quenched samples. The values of eutectic spacing, microhardness and ultimate tensile strength of alloys were measured. The dependency of the microstructure and mechanical properties on growth rate and temperature gradient were investigated using regression analysis.

EFFECTS OF TEMPERATURE GRADIENT ON LAMELLAR ORIENTATIONS OF DIRECTIONAL SOLIDIFIED TiAl--BASED ALLOY

2011 ◽  
Vol 46 (10) ◽  
pp. 1223-1229 ◽  
Author(s):  
Zhixia XIAO ◽  
Lijing ZHENG ◽  
Lili YANG ◽  
Jie YAN ◽  
Hu ZHANG
Keyword(s):  
Temperature Gradient ◽  
Effects Of Temperature
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