Investigation of the completeness of specimen degassing in an analysis of the hydrogen content of aluminum alloys

Metallurgist ◽  
2011 ◽  
Vol 55 (3-4) ◽  
pp. 303-310 ◽  
Author(s):  
A. M. Polyanskii ◽  
V. A. Polyanskii ◽  
Yu. A. Yakovlev
Keyword(s):  
Aluminum Alloys ◽  
Hydrogen Content

scholarly journals Reduction of hydrogen content in 7000 series aluminum alloys by heat treatment in air

2018 ◽  
Vol 68 (3) ◽  
pp. 150-151
Author(s):  
Isao Matsui ◽  
Mingjun Li ◽  
Yuichiro Murakami ◽  
Naoki Omura
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloys ◽  
Hydrogen Content

New Process of Elimination of Hydrogen from Melt Aluminum

2008 ◽  
Vol 51 ◽  
pp. 93-98 ◽  
Author(s):  
Jian Min Zeng ◽  
Zheng Bin Xu ◽  
Juan He
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Diffusion Equation ◽  
Hydrogen Content ◽  
Hydrogen Transfer ◽  
Liquid Aluminum ◽  
New Process

Hydrogen is the only gas that is appreciably soluble in aluminum and its alloy. Its solubility is small but its effects on the mechanical properties and finishing characteristics of aluminum alloys are significant. In this paper, a patented degassing process, which is based on the vacuum metallurgy principle, is proposed. The diffusion equation was used for explaining hydrogen transfer in the liquid aluminum under the function of a porous sucking head. RPT experiment was carried out to evaluate effectiveness of the process. The experiment indicates that the hydrogen content can be dramatically reduced to 0.05ml/100gAl owing to the use of this new process.

Effects of Heating Atmosphere on Structure and Thermal Expansion of Aluminum Alloys

2015 ◽  
Vol 788 ◽  
pp. 163-169 ◽  
Author(s):  
Vladimir Afanasyef ◽  
Marina Popova ◽  
Aleksandr Prudnikov
Keyword(s):  
Solid Solution ◽  
Thermal Expansion ◽  
Aluminum Alloys ◽  
Hydrogen Content ◽  
Linear Expansion ◽  
Linear Thermal Expansion ◽  
High Oxygen Content ◽  
Temperature Range ◽  
Oxidizing Atmosphere ◽  
Coefficient Of Linear Expansion

This paper analyses effects of boiling treatment of aluminum alloys (Al–(5-10)% Cu and Al–(5-10)% Si) in oxidizing atmosphere on their microstructure, hydrogen content and coefficient of linear thermal expansion (CLE). Boiling treatment was conducted in water solutions of KMnO4and KOH. Following an increase of boiling time from 15 to 75 hours hydrogen content in alloys first increases and then decreases which correlates with the dynamics of alloys’ microstructure and their coefficient of linear expansion. This study shows that atmosphere with high oxygen content induces acceleration of diffusion processes in aluminum alloys. If boiling time does not exceed 30 hours, hydrogen content in solid solution and etchability of grain boundaries of α-solid solution decrease and intermediate phases get partially dissolved. In our empirical study we demonstrated that boiling treatment of aluminum alloys in oxidizing atmosphere in the range of test temperatures 50-450°С leads to a reduction of the coefficient of linear expansion. The decrease of the coefficient of linear expansion is especially strong in the temperature range of 250-350°С. In particular, after boiling treatment of alloys Al–(5-10)% Cu in oxidizing athmosphere in the temperature range of 50–250°С their coefficient of linear expansion goes down by 10-12%. For alloys Al–(5-10)% Si boiling has a stronger effect on the coefficient of linear expansion – in the temperature range 250-350°С the CLE of these alloys decreases by 24-28%.

scholarly journals Neutron Imaging Analysis of Hydrogen Content in Pure Palladium and Aluminum Alloys

2019 ◽  
Vol 83 (11) ◽  
pp. 434-440 ◽  
Author(s):  
Kazuyuki Shimizu ◽  
Hirotoshi Hayashida ◽  
Hiroyuki Toda ◽  
Tetsuya Kai ◽  
Yoshihiro Matsumoto ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Hydrogen Content ◽  
Neutron Imaging ◽  
Imaging Analysis ◽  
Pure Palladium

Analytical Electron Microscopy Study of Second-Phase Particles in 7075 and 7475 Aluminum Alloys

1985 ◽  
Vol 43 ◽  
pp. 348-349
Author(s):  
M. Raghavan ◽  
J. Y. Koo ◽  
J. W. Steeds ◽  
B. K. Park
Keyword(s):  
Aluminum Alloys ◽  
Silicon Oxide ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Partial Substitution ◽  
Second Phase ◽  
X Ray ◽  
Second Phase Particles ◽  
Almost All

X-ray microanalysis and Convergent Beam Electron Diffraction (CBD) studies were conducted to characterize the second phase particles in two commercial aluminum alloys -- 7075 and 7475. The second phase particles studied were large (approximately 2-5μm) constituent phases and relatively fine ( ∼ 0.05-1μn) dispersoid particles, Figures 1A and B. Based on the crystal structure and chemical composition analyses, the constituent phases found in these alloys were identified to be Al7Cu2Fe, (Al,Cu)6(Fe,Cu), α-Al12Fe3Si, Mg2Si, amorphous silicon oxide and the modified 6Fe compounds, in decreasing order of abundance. The results of quantitative X-ray microanalysis of all the constituent phases are listed in Table I. The data show that, in almost all the phases, partial substitution of alloying elements occurred resulting in small deviations from the published stoichiometric compositions of the binary and ternary compounds.

Electrochemical Impedance Characteristics of Sintered 7075 Aluminum Alloy Under Ssrt Condition

2013 ◽  
Vol 58 (2) ◽  
pp. 505-508 ◽  
Author(s):  
S. Sunada ◽  
N. Nunomura
Keyword(s):  
Aluminum Alloys ◽  
Complex Shape ◽  
Electrochemical Impedance ◽  
Ingot Metallurgy ◽  
View Point ◽  
Corrosion Properties ◽  
Electrochemical Tests ◽  
Impedance Characteristics ◽  
Polarization Test ◽  
Conventional Ingot

Powder metallurgy (P/M) process has the advantage of better formability to fabricate complex shape products without machining and welding. And recently this P/M process has been applied to the production of aluminum alloys. The P/M aluminum alloys thus produced also have received considerable interest because of their fine and homogeneous structure. Many papers have been published on the mechanical properties of the aluminum alloys produced by P/M process while there have been few on their corrosion properties from the view point of electrochemistry. In this experiment, therefore, two kinds of 7075 aluminum alloys prepared by the conventional ingot metallurgy (I/M) process and P/M process were used, I/M material is commercially available. and their corrosion behavior were investigated through the electrochemical tests such as potentiodynamic polarization test, slow rate strain tensile (SSRT) test and electrochemical impedance spectroscopy (EIS) measurement under SSRT test in the corrosion solution and the deionized water.

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