Influences of La addition on the hydrogen storage performances of TiFe-base alloy

2021 ◽  
pp. 110176
Author(s):  
Tingting Zhai ◽  
Zhen Wei ◽  
Zeming Yuan ◽  
Zhonggang Han ◽  
Dianchen Feng ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Base Alloy ◽  
La Addition

Effect of Lanthanum Addition on Microstructure and Hardness as Cooling Rate Function of ADC12 Eutectic Cast Alloy

2015 ◽  
Vol 1119 ◽  
pp. 495-499
Author(s):  
Roslee Ahmad ◽  
Mohammed Bsher A. Asmael
Keyword(s):  
Experimental Investigation ◽  
Cooling Rate ◽  
Base Alloy ◽  
Cast Alloy ◽  
Rate Function ◽  
Ceramic Mold ◽  
La Addition ◽  
Different Thickness

This paper presents the experimental investigation conducted on ADC12 cast alloy. The main objective of the research is to investigate the effect of 1.5%La addition with different cooling rate on microstructure and hardness value of ADC12 cast alloy. The Ceramic Mold with different thickness dimensions was use to obtained different cooling rate. The Si structure became modified by increase the cooling rate of base alloy. With La addition the Si size observed smaller area than base alloy when the cooling rate increases. In addition, the higher cooling rate and La addition improves the hardness specially at lower thickness with La addition.

Effect of Elements Cerium and Lanthanum on Eutectic Solidification of Al-Si-Cu near Eutectic Cast Alloy

2013 ◽  
Vol 845 ◽  
pp. 118-122 ◽  
Author(s):  
M.B.A. Asmael ◽  
Roslee Ahmad ◽  
Ali Ourdjini ◽  
S. Farahany
Keyword(s):  
Growth Temperature ◽  
Base Alloy ◽  
Cast Alloy ◽  
Eutectic Silicon ◽  
Cooling Curve ◽  
Eutectic Solidification ◽  
Silicon Phase ◽  
Cast Alloys ◽  
La Addition ◽  
Two Phases

The properties of Al-Si-Cu cast alloys are strongly affected by eutectic Al-Si and Al-Cu phases. The characteristic parameters of these two phases with additions cerium 1wt % (Ce) and lanthanum1 wt % (La) were investigated in Al-11Si-2Cu near eutectic alloy using computer-aided cooling curve thermal analysis. As a result, the La additive showed the highest (TNAl-Si) while the Ce additive showed very little effect. In addition, the growth temperature (TGAl-Si) is decreased by adding Ce compared to the base alloy and La addition. Additives showed an increase of recalescence magnitude (TRAl-Si). Addition La and Ce increased the nucleation and growth temperature of Al-Cu phase. The microstructure analysis on the silicon morphology showed that 1 wt % La and 1 wt % Ce additions play refiner role in Al-Si-Cu near eutectic alloys. Findings are also confirmed by aspect ratio of eutectic silicon phase.

Synthesis and Characterization of Nanostructure Magnesium Base Alloy by Mechanical Alloying for Hydrogen Storage Application

2012 ◽  
Vol 710 ◽  
pp. 332-337
Author(s):  
Rengasamy Selvaraj ◽  
M. Thirumurugan ◽  
S. Kumaran ◽  
T. Srinivasa Rao
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Base Alloy ◽  
Structural Evolution ◽  
Hydrogen Desorption ◽  
Hydrogenation Reaction ◽  
Desorption Kinetics ◽  
X Ray Diffraction ◽  
Hydrogen Interaction ◽  
Powder Particles

Hydrogen storage is a key enabling technology for the advancement of hydrogen and fuel cell power technologies in transportation, stationary, and portable applications. The hydrogen transport from surface to the core of the metal powder particles is an important step during a hydrogenation reaction. Therefore, the hydrogen desorption kinetics are required for a complete understanding of the hydrogenation mechanism. In this present work, Mg-Ni-Nb systems were synthesized by mechanical alloying under optimized milling parameters (milling speed, milling time). The structural evolution (nanostructure, formation of intermetallic phases, etc) during ball milling was studied by X-ray diffraction. The activation energy of the mechanical alloyed powders was studied for Mg-Ni-Nb systems. Hydrogenation and dehydrogenation studies were carried out and understood the hydrogen interaction with Mg based alloys.

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Suppression of γ’ Precipitation in a Laser-Melted Nickel-Base Alloy

1977 ◽  
Vol 35 ◽  
pp. 270-271
Author(s):  
J. M. Walsh ◽  
J. C. Whittles ◽  
B. H. Kear ◽  
E. M. Breinan
Keyword(s):  
Cooling Rate ◽  
Base Alloy ◽  
Material Surface ◽  
Intimate Contact ◽  
Absorbed Power ◽  
Perfect Contact ◽  
Nickel Base ◽  
Rapidly Solidified ◽  
Limiting Case ◽  
The Heat Transfer Coefficient

Conventionally cast γ’ precipitation hardened nickel-base superalloys possess well-defined dendritic structures and normally exhibit pronounced segregation. Splat quenched, or rapidly solidified alloys, on the other hand, show little or no evidence for phase decomposition and markedly reduced segregation. In what follows, it is shown that comparable results have been obtained in superalloys processed by the LASERGLAZE™ method.In laser glazing, a sharply focused laser beam is traversed across the material surface at a rate that induces surface localized melting, while avoiding significant surface vaporization. Under these conditions, computations of the average cooling rate can be made with confidence, since intimate contact between the melt and the self-substrate ensures that the heat transfer coefficient is reproducibly constant (h=∞ for perfect contact) in contrast to the variable h characteristic of splat quenching. Results of such computations for pure nickel are presented in Fig. 1, which shows that there is a maximum cooling rate for a given absorbed power density, corresponding to the limiting case in which melt depth approaches zero.

The Nature of Delta Phase Precipitation in Inconel 718

1982 ◽  
Vol 40 ◽  
pp. 724-725
Author(s):  
L. S. Lin ◽  
C. C. Law
Keyword(s):  
Inconel 718 ◽  
Base Alloy ◽  
High Strength ◽  
Physical Metallurgy ◽  
Nickel Base Alloy ◽  
Phase Precipitation ◽  
Weight Percentage ◽  
Delta Phase ◽  
The Subject ◽  
Nickel Base

Inconel 718, a precipitation hardenable nickel-base alloy, is a versatile high strength, weldable wrought alloy that is used in the gas turbine industry for components operated at temperatures up to about 1300°F. The nominal chemical composition is 0.6A1-0.9Ti-19.OCr-18.0Fe-3Mo-5.2(Cb + Ta)- 0.1C with the balance Ni (in weight percentage). The physical metallurgy of IN 718 has been the subject of a number of investigations and it is now established that hardening is due, primarily, to the formation of metastable, disc-shaped γ" an ordered body-centered tetragonal structure (DO2 2 type superlattice).

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