scholarly journals Influence of Growth Rate and Magnetic Field on Microstructure and Properties of Directionally Solidified Ag-Cu Eutectic Alloy

Materials ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 569 ◽  
Author(s):  
Xiaowei Zuo ◽  
Congcong Zhao ◽  
Lin Zhang ◽  
Engang Wang
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Eutectic Alloy ◽  
Directionally Solidified ◽  
Microstructure And Properties

Effect of a High Magnetic Field on the Microstructure of Directionally Solidified NiAl-Cr(Mo)-Si Near-Eutectic Alloy at Different Withdrawal Rates

2017 ◽  
Vol 898 ◽  
pp. 407-412 ◽  
Author(s):  
Huan Liu ◽  
Wei Dong Xuan ◽  
Xing Fu Ren ◽  
Bao Jun Wang ◽  
Jian Bo Yu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Eutectic Alloy ◽  
Magnetic Force ◽  
Volume Fraction ◽  
Withdrawal Rate ◽  
Directionally Solidified ◽  
Combined Action ◽  
Columnar To Equiaxed Transition ◽  
The Magnetic Field

The effect of a 6T high magnetic field on the microstructure of directionally solidified NiAl-Cr (Mo)-Si near-eutectic alloy was investigated at the withdrawal rates of 2, 10 and 50 μm/s. The results showed that the microstructure evolved from planar eutectic to primary NiAl dendrites + cellular eutectic and then to dendritic eutectic with the increasing withdrawal rate. When the magnetic field was imposed, the well-aligned eutectic lamellae were disturbed and transformed into a wavy one at 2 μm/s. When the withdrawal rate increased to 10 μm/s, the application of the magnetic field destroyed the primary NiAl dendrite array and caused the occurrence of columnar-to-equiaxed transition (CET) of the NiAl dendrites. The volume fraction of primary dendrites also decreased. In addition, the width of intercellular/interdendritic regions decreased in cellular/dendritic eutectic structures when directionally solidified under the magnetic field. The above results should be attributed to the combined action of the thermoelectric magnetic force and the thermoelectric magnetic convection.

Influence of Growth Rate on Microstructural Length Scales in Directionally Solidified NiAl-Mo Hypo-Eutectic Alloy

JOM ◽  
2015 ◽  
Vol 68 (1) ◽  
pp. 178-184 ◽  
Author(s):  
Jianfei Zhang ◽  
Xuewei Ma ◽  
Huiping Ren ◽  
Lin Chen ◽  
Zili Jin ◽  
...  
Keyword(s):  
Growth Rate ◽  
Eutectic Alloy ◽  
Directionally Solidified ◽  
Length Scales

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.

Effect of a magnetic field on the banding phenomenon in aluminium–silicon eutectic alloy

1968 ◽  
Vol 46 (14) ◽  
pp. 1589-1595 ◽  
Author(s):  
E. A. Falquero ◽  
W. Saunders ◽  
W. V. Youdelis
Keyword(s):  
Magnetic Field ◽  
Eutectic Alloy ◽  
Solidification Rate ◽  
Magnetic Field Effect ◽  
Impurity Level ◽  
Directionally Solidified ◽  
Band Formation ◽  
Band Spacing ◽  
Solidification Speed ◽  
Solid Liquid Interface

The effect of a magnetic field on the frequency of transverse band formation in directionally solidified Al–Si eutectic alloy is investigated for a range of solidification speeds. The band spacing for both field and no-field ingots is found to be linearly dependent on the solidification rate, but for a given solidification speed a magnetic field of 30 000 Oe, applied perpendicular to the solidification direction, reduced the band spacing by approximately 35%. The results are explained in terms of the effects of the solidification rate and magnetic field on the impurity concentration ahead of the solid–liquid interface, a fluctuating impurity level being the direct cause of the banding phenomenon. It is shown that the magnetic-field effect on band spacing is consistent with the theories (previously published) developed to account for the observed effects of a magnetic field on alloy diffusion and solidification.

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