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 Growth Rate on Microstructure and Mechanical Properties of the Directionally Solidified Nb-Si Eutectic Alloy

2002 ◽  
Vol 753 ◽  
Author(s):  
Nobuaki Sekido ◽  
Yoshisato Kimura ◽  
Yoshinao Mishima
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Growth Rate ◽  
High Temperature ◽  
Eutectic Alloy ◽  
Unidirectional Solidification ◽  
High Temperature Strength ◽  
Directionally Solidified ◽  
System A ◽  
Superior Mechanical Properties

ABSTRACTThe development of ultra-high temperature structural materials having superior mechanical properties to the nickel based superalloys has been pursued in the niobium silicide based composites. The unidirectional solidification technique was performed on the (Nb)/Nb3Si eutectic alloy in the Nb-Si binary system. A continuity of Nb phases in the eutectic microstructure increases with decreasing a growth rate, which yields the enhancement of fracture toughness as well as high temperature strength. The mechanisms of microstructural formation, toughening, and strengthening are briefly discussed.

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.

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