Microstructure of a Rapidly Solidified Al-Fe-Co-Ni Alloy

1981 ◽  
Vol 8 ◽  
Author(s):  
T. H. Sanders ◽  
H. G. Paris ◽  
J. W. Mullins
Keyword(s):  
Solidification Rate ◽  
Size Distributions ◽  
Ni Alloy ◽  
Rate Effects ◽  
Rapidly Solidified

ABSTRACTObservations made on different consolidated and wrought microstructures suggested that in addition to the simple variations in size and size distributions there were also differences in shape. Furthermore, clusters of oriented precipitates were often observed. The different particle morphologies were related to solidification rate effects. This paper describes the changes in microstructure which occur during the heating of rapidly solidified AI-3.3Fe-4.6Co-2.3Ni splat.

The Structure of Rapidly Solidified Powders of Ni3Al and Ni3 Al + B + Ti

1983 ◽  
Vol 28 ◽  
Author(s):  
I. Baker ◽  
F. Ichishita ◽  
E.M. Schulson
Keyword(s):  
Particle Size ◽  
Rapid Solidification ◽  
Solidification Rate ◽  
Dendritic Structure ◽  
Arithmetic Mean ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
X Ray ◽  
Log Normal ◽  
Rapidly Solidified

ABSTRACTPowders of stoichiometric Ni3Al and Ni3Al containing boron and titanium were produced by rapid solidification rate (RSR) processing. Most particles were found to be spherical; some had skins and some contained holes. Fractured particles were found, indicating possible brittleness. Particle size distributions were log-normal with an arithmetic mean particle size of 23.5μm. Both alloys exhibited a dendritic structure in which compositional differences were present. In addition, stoichiometric Ni3Al contained interdendritic lamellae. X-ray diffractometry indicated that the powders were only partially ordered.

Rapidly solidified Al–6.5 wt.% Ni alloy

2003 ◽  
Vol 142 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Musa Gögebakan ◽  
Orhan Uzun ◽  
Tuncay Karaaslan ◽  
Mustafa Keskin
Keyword(s):  
Ni Alloy ◽  
Rapidly Solidified

Effect of rapid solidification and calcium additions on Sn-38 wt.%Pb-6 wt.%Sb melt-spun alloys

2016 ◽  
pp. 3224-3235
Author(s):  
Rizk Mostafa Shalaby ◽  
Shalabia Badr ◽  
Nermin Ali Abdelhakim ◽  
Mustafa Kamal
Keyword(s):  
Elastic Moduli ◽  
Solidification Rate ◽  
Calcium Content ◽  
Density Fluctuations ◽  
Inter Metallic Compound ◽  
Quenching Rate ◽  
Mechanical And Electrical Properties ◽  
Melt Spun ◽  
Modes Of Interaction ◽  
Rapidly Solidified

The effect of calcium additions on the structure and physical properties of melt-spun process Sn-38Pb-6Sb alloys have been experimentally investigated at a solidification rate of ~105 K/s. Structure, internal friction, elastic moduli, microhardness and electrical resistivity of the Sn-38%Pb , Sn-38%Pb -6%Sb , Sn-38%Pb -6%Sb-0.5%Ca , Sn-38%Pb -6%Sb -1%Ca , Sn-38%Pb -6%Sb -1.5%Ca , Sn-38%Pb -6%Sb -2%Ca , Sn-38%Pb -6%Sb -2.5%Ca (in wt%) rapidly solidified alloys are investigated. The results showed that the mechanical and electrical properties values are enhanced for ternary Sn-38%Pb -6%Sb alloy. The examined mechanical and electrical conductivity decreased by addition of calcium content in the studied alloys. It also leads to with increasing Ca content the SnSb inter-metallic compound (IMC) precipitates are increased in the Sn matrix. The results were explained in terms of the dislocation theory, effect of quenching rate on the produced density fluctuations in composition and the modes of interaction of crystal lattice defects.

Microstructure of a rapidly solidified Al-7.8% Ni alloy

1983 ◽  
Vol 12 (3) ◽  
pp. 272-273
Author(s):  
R. Nyborg ◽  
O. Lohne ◽  
R. Høier
Keyword(s):  
Ni Alloy ◽  
Rapidly Solidified

Investigation on Sub-Rapid Solidification Behavior of Semi-Solid Magnesium Alloy Metal

2011 ◽  
Vol 320 ◽  
pp. 156-162
Author(s):  
Hai Tao Teng ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Ting Ju Li
Keyword(s):  
Magnesium Alloy ◽  
Rapid Solidification ◽  
Volume Fraction ◽  
Solidification Rate ◽  
Solid Particles ◽  
Solidification Behavior ◽  
Vacuum Suction ◽  
Semi Solid ◽  
Rapidly Solidified ◽  
Alloy Metal

In order to investigate sub-rapid solidification behavior of semi-solid magnesium alloy metal, a novel semi-solid processing technique, called new vacuum suction casting (NVSC), is used to manufacture thin castings of AZ91D Mg-alloy directly from a liquid metal. The resulting microstructures of castings are characterized in detail and linked to the solidification behavior. In the microstructure of the sub-rapidly solidified SSM sheet, the “preexisting” primary solid particles, with the morphology of near-globules or rosettes, disperse in the homogeneous matrix consisting of fine near-equiaxed secondary α-Mg grains and fine precipitates of β-Mg17Al12 intermetallics. Owing to rapid solidification rate, the volume fraction of the β phase in the sub-rapidly solidified SSM sheets is much lower than that in the as-cast ingot. In addition, the content of alloying elements of Al and Zn was higher in the grain boundaries and the eutectic structure than that in the primary solid particles and in the second α-grains.

Inhibited cold compactibility of rapidly solidified Al–Si alloy powder with large solidification rate

2015 ◽  
Vol 26 (5) ◽  
pp. 1458-1464 ◽  
Author(s):  
Zhiyong Cai ◽  
Richu Wang ◽  
Chun Zhang ◽  
Chaoqun Peng ◽  
Yan Feng
Keyword(s):  
Alloy Powder ◽  
Solidification Rate ◽  
Rapidly Solidified

Structural aspects of rapidly solidified Al-Cr-Fe-Ni alloy

Metal Science ◽  
1984 ◽  
Vol 18 (12) ◽  
pp. 561-570 ◽  
Author(s):  
G.,J. Marshall ◽  
T. Sheppard
Keyword(s):  
Ni Alloy ◽  
Rapidly Solidified ◽  
Structural Aspects

Material with Novel Compositions and Fine Microstructljres Produced Via the Mixalloy Process

1988 ◽  
Vol 132 ◽  
Author(s):  
Arthur K. Lee ◽  
Luis E. Sanchez-Caldera ◽  
Jung-Hoon Chun ◽  
Nam P. Suh
Keyword(s):  
High Performance ◽  
Liquid Metals ◽  
Solidification Rate ◽  
Copper Alloys ◽  
Fine Microstructure ◽  
The Matrix ◽  
New Processing ◽  
Rapidly Solidified ◽  
Economical Alternative

ABSTRACTA new processing method, the Mixalloy process, has been developed to process alloys with novel microstructures and compositions. In this process, microstructural control is achieved through the use of turbulent mixing of liquid metals in addition to controlling solidification rate and chemical composition. Boride dispersion strengthened copper alloys were produced using the Mixalloy process. Thermally stable and fine (average less than 100 nm) boride dispersoids were formed by in-situ chemical reaction in the copper alloy matrices during mixing. The uniform mixture of the matrix and dispersoids was then rapidly solidified to maintain the fine microstructure. The consolidated material shows exceptional thermal stability and an excellent combination of strength, ductility, and electrical conductivity. Furthermore, the flexibility of the process allows the matrices of these dispersion strengthened coppers to be easily alloyed to fulfill specific needs. The versatility and simplicity of the Mixalloy process provide an economical alternative to other processing means in the manufacturing of high performance alloys such as dispersion strengthened alloys.

COOLING RATE EFFECTS ON DYNAMICS IN SUPERCOOLED Al2O3

2006 ◽  
Vol 20 (08) ◽  
pp. 947-967 ◽  
Author(s):  
VO VAN HOANG ◽  
SUHK KUN OH
Keyword(s):  
Cooling Rate ◽  
Cluster Size ◽  
Distribution Functions ◽  
Rate Dependence ◽  
Structural Defects ◽  
Radial Distribution Functions ◽  
Size Distributions ◽  
Pair Potentials ◽  
Rate Effects ◽  
Good Agreement

The cooling rate effects in supercooled Al 2 O 3 have been investigated by Molecular Dynamics (MD) method. Simulations were done in the basic cube under periodic boundary conditions containing 3000 ions with Born–Mayer type pair potentials. The temperature of the system was decreased linearly in time as T(t)=T0–γt, where γ is the cooling rate. The cooling rate dependence of density, thermal expansion coefficient and enthalpy of the system was found. Structure of amorphous Al 2 O 3 model at the temperature of 0 K was in good agreement with Lamparter's experimental data. The cooling rate dependence of the dynamical heterogeneities in supercooled states has been studied through the comparison of the partial radial distribution functions (PRDFs) for the 10% most mobile or immobile particles with the corresponding mean PRDFs in the models. Also, cooling rate effects on the cluster size distributions of the most mobile or immobile particles have been obtained. Calculations show that the cooling rate effects on the dynamical heterogeneities are pronounced. Finally, the evolution of structural defects and cluster size distributions of the most mobile or immobile particles in the system upon cooling has been studied and presented.

Co-Deposition of Al–Ni Alloy in NiCl2-AlCl3-1-ethyl-3-methylimidazolium Bromide ([EMIM]Br) Ionic Liquid

2011 ◽  
Vol 121-126 ◽  
pp. 65-69
Author(s):  
Li Peng Zhang ◽  
Xian Jin Yu ◽  
Zhi Wei Ge ◽  
Yun Hui Dong ◽  
Dang Gang Li
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Room Temperature ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Rapidly Solidified ◽  
Scanning Electron

Al-Ni Alloys were obtained from NiCl2-AlCl3-1-ethyl-3-methylimidazolium bromide ([EMIM]Br) ionic liquid at room temperature. The analysis of Al-Ni alloys that co-deposited at different potentials for 2h were performed using Scanning Electron Microscopy (SEM) and X-ray diffraction analysis (XRD). It appears that Ni has been rapidly solidified in the alloys and homogeneous Al-Ni alloys can be obtained at room temperature. As increasing the overpotential, the amount of Ni in the alloys was decreased whereas the amount of Al was increased. The chloride pitting potentials of alloys with the molar ratio of NiCl2/AlCl3/[EMIM]Br 0.03:2:1 was approximately 0.3 V more than pure Al.

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