Relationship between crack initiation of hydrogen embrittlement and second-phase particles in 6000 series aluminum alloys

2016 ◽  
Vol 2016.24 (0) ◽  
pp. 416
Author(s):  
Gouki AKABA ◽  
Kengo MOCHIZUKI ◽  
Toshiaki MANAKA ◽  
Goroh ITOH
Keyword(s):  
Aluminum Alloys ◽  
Hydrogen Embrittlement ◽  
Crack Initiation ◽  
Second Phase ◽  
Second Phase Particles

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.

Effect of Micro-Voids on Crack Initiation and Propagation in Bending Deformation of Al-Mg-Si Alloy Sheet

2014 ◽  
Vol 794-796 ◽  
pp. 325-330 ◽  
Author(s):  
Yusuke Yamamoto ◽  
Mineo Asano ◽  
Hideo Yoshida ◽  
Masakazu Kobayashi ◽  
Hiroyuki Toda
Keyword(s):  
Crack Initiation ◽  
Phase Particle ◽  
Shear Bands ◽  
Alloy Sheet ◽  
Second Phase ◽  
Coarse Particles ◽  
Crack Initiation And Propagation ◽  
Cube Orientation ◽  
Second Phase Particles ◽  
Initiation And Propagation

The crack initiation and propagation during bending have been considered to be affected by second phase particles, micro-voids and shear-bands. However, the effects of the second phase particles and the micro-voids on the crack initiation and propagation during bending have not been fully investigation. In this study, the effect of the second phase particle distribution on the formation of micro-voids, and the effect of the micro-voids on the crack initiation and propagation during bending were investigated using the largest synchrotron radiation facility “SPring-8” and FE-SEM/EBSD. With the bending ratio increasing, the micro-voids increased around the coarse particles near the outer surface. In particular, coarse micro-voids were formed around coarse particles with a high aspect ratio on the shear-bands. At a large cracked part, coarse micro-void was observed at the outmost layer section as a crack initiation site, and coarse micro-voids and asheared fracture surface were observed at the crack propagation site. At the small cracked part with no propagation, cube orientation grains were located under the small crack. It was considered that these cube orientation grains inhibited the formation of shear-bands, therefore, propagation of the cracks did not occur at the small cracked area.

Corrosion Product Films Formed on Aluminum In High Temperature Wester

CORROSION ◽  
1961 ◽  
Vol 17 (4) ◽  
pp. 181t-184t ◽  
Author(s):  
D. F. MacLENNAN
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Aluminum Alloys ◽  
Corrosion Product ◽  
High Purity ◽  
Second Phase ◽  
Corrosion Product Film ◽  
Second Phase Particles ◽  
Product Film

Abstract A study was made of the behavior of aluminum alloys exposed to 300 G high purity water for short periods of time. The corrosion products formed were examined by means of optical and electron microscopy. Results show that corrosion resistance is associated with the distribution of second phase particles in the alloys. The alloy, which had the best corrosion resistance, contained the most uniform distribution of cathodic second phase particles; the corrosion product film of this alloy contained a corresponding distribution of irregularities. It is suggested that the second phase particles modify the film in such a way as to increase its protective qualities. 6.4.2, 4.6.5, 3.2.3

Corrosion of Aluminum Alloys In High Purity Water in the Range 150 C – 340 C

CORROSION ◽  
1961 ◽  
Vol 17 (5) ◽  
pp. 239t-242t ◽  
Author(s):  
D. F. MacLENNAN
Keyword(s):  
Aluminum Alloys ◽  
Cross Section ◽  
High Purity ◽  
The Other ◽  
Second Phase ◽  
Second Phase Particles ◽  
The Cross

Abstract Examination of the cross-section of the film on aluminum and its alloys, while attached to the metal, reveals that the second phase particles play an important part in the corrosion pattern. The 2S aluminum contains at least two types of second phase particles, one of which corrodes more rapidly while the other corrodes more slowly than the surrounding aluminum. The majority of second phase particles in the 157 alloy corrode more slowly than the surrounding aluminum. 6.4.2, 4.6.5, 3.2.3

Preparation of millimeter scale second phase particles in aluminum alloys and determination of their mechanical properties

2019 ◽  
Vol 784 ◽  
pp. 68-75 ◽  
Author(s):  
Xinyue Lan ◽  
Kai Li ◽  
Fuxin Wang ◽  
Yanqing Su ◽  
Mingjun Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Second Phase ◽  
Second Phase Particles
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