scholarly journals Effect of strain rate on hydrogen gas evolution behavior during tensile deformation in 6061 and 7075 aluminum alloys

2012 ◽  
Vol 62 (8) ◽  
pp. 306-312 ◽  
Author(s):  
Keitaro Horikawa ◽  
Hiroyuki Yamada ◽  
Hidetoshi Kobayashi
Keyword(s):  
Aluminum Alloys ◽  
Strain Rate ◽  
Tensile Deformation ◽  
Hydrogen Gas ◽  
Gas Evolution ◽  
Evolution Behavior

Quantitative Detection of Hydrogen Gas Release during Slow Strain Rate Testing in Aluminum Alloys

2021 ◽  
Vol 1016 ◽  
pp. 568-573
Author(s):  
Keitaro Horikawa ◽  
Michiko Arayama ◽  
Hidetoshi Kobayashi
Keyword(s):  
Aluminum Alloys ◽  
Strain Rate ◽  
Local Strain ◽  
Hydrogen Sensor ◽  
Hydrogen Gas ◽  
Slow Strain Rate ◽  
Image Correlation ◽  
Quantitative Detection ◽  
Gas Release ◽  
Closed Chamber

We have developed a new testing device which is capable of detecting hydrogen gas release during slow strain rate tensile testing (SSRT) under ordinary pressure. The device is composed of an SSRT machine equipped with a closed chamber with an inspection window that is connected to gas chromatography with a semiconductor hydrogen sensor. Local strain distribution in the specimen during the SSRT is monitored dynamically with a digital image correlation (DIC) method. Hydrogen was pre-charged to aluminum alloys by means of friction in water process. Using the device, it was shown that hydrogen was released particularly in the stage of plastic deformation and fracture. In addition, the hydrogen gas release at the moment of fracture was clearly increased when the alloys were hydrogen-charged and tested at a slow strain rate. When we calculated hydrogen gas release from the fracture surface in Al-Zn-Mg base alloys tested at 3.3×10-6 s-1, the hydrogen amount was estimated to be 6.24×10-10 mol /mm2 in a hydrogen-uncharged alloy, and 1.30×10-9 mol / mm2 in a hydrogen-charged alloy.

The Effect of Surface Nano and Microstructures on Hydrogen Gas Evolution Behavior on Ni Patterned Electrodes

2020 ◽  
Vol MA2020-02 (18) ◽  
pp. 1524-1524
Author(s):  
Tatsuki Fujimura ◽  
Masahiro Kunimoto ◽  
Yasuhiro Fukunaka ◽  
Takayuki Homma
Keyword(s):  
Hydrogen Gas ◽  
Gas Evolution ◽  
Patterned Electrodes ◽  
Evolution Behavior ◽  
Effect Of Surface

Susceptibility of Iron-Rich Fe-Al Alloys to Embrittlement by Hydrogen and Water

1994 ◽  
Vol 364 ◽  
Author(s):  
R. J. Lynch ◽  
L. A. Heldt
Keyword(s):  
Aluminum Alloys ◽  
Strain Rate ◽  
Al Alloys ◽  
Hydrogen Gas ◽  
Strain Rates ◽  
Moist Air ◽  
Environmental Sensitivity ◽  
Strain Rate Effects ◽  
Rate Effects

AbstractIron-rich Fe-Al alloys have been tensile tested in moist air and dry oxygen at a strain rate of 3.3×10−4 s−1. Moist air did not cause embrittlement until the composition reached 18-20% Al. Alloys with lower aluminum contents were embrittled when tested in hydrogen gas. The environmental sensitivity of these alloys was further investigated by examining the effects of strain rate on the ductility. For the most part, no significant strain rate effects were observed in the low aluminum alloys; strain rates of up to 3.3×10−1 s−1 were not fast enough to prevent embrittlement. In contrast, the ductility of Fe-35 at.% Al did increase with increasing strain rate in air and hydrogen; at a strain rate of 3.3×10−1 s−1 the elongations approached that of vacuum.

scholarly journals 555 Hydrogen Evolution Behavior Subjected to Various Loading in Aluminum Alloys for High-pressure Hydrogen Gas Container

2013 ◽  
Vol 2013 (0) ◽  
pp. 140-141
Author(s):  
Masaki TSURUDOME ◽  
Seishin TSUJI ◽  
Shoji KAWASAKI ◽  
Hiroyuki YAMADA ◽  
Nagahisa OGASAWARA
Keyword(s):  
High Pressure ◽  
Aluminum Alloys ◽  
Hydrogen Evolution ◽  
Hydrogen Gas ◽  
Evolution Behavior ◽  
Pressure Hydrogen

Hydrogen Evolution Behavior during Tensile Deformation in Austenitic Stainless Steels Exposed to High Compressed Hydrogen Atmospheres

2010 ◽  
Vol 654-656 ◽  
pp. 2519-2522
Author(s):  
Keitaro Horikawa ◽  
Hidetoshi Kobayashi ◽  
Motohiro Kanno
Keyword(s):  
Hydrogen Evolution ◽  
Stainless Steels ◽  
Tensile Deformation ◽  
Testing Machine ◽  
Austenitic Stainless Steels ◽  
Local Deformation ◽  
Hydrogen Gas ◽  
Deformation And Fracture ◽  
Rate Testing ◽  
Evolution Behavior

Hydrogen embrittlement sensitivity of austenitic stainless steels, SUS316L and SUS310S exposed to high compressed hydrogen gas atmospheres was evaluated by means of a slow strain rate testing (SSRT) in air. Hydrogen evolution behavior during tensile deformation and fracture was also investigated by using a testing machine equipped with a quadrupole mass spectrometer installed in an ultrahigh vacuum chamber. When the SUS 316L specimen with hydrogen gas charging were deformed at a very slow crosshead speed of 1.67 nm/s, local deformation was promoted as compared to the specimen without hydrogen gas charging. On the other hand, no decrease of the ductility was observed in the SUS310S specimen with hydrogen gas charging even in the SSRT. In the hydrogen charged SUS316L specimen, the amount of continuous hydrogen evolution throughout deformation was much higher than that in the specimen without hydrogen gas charging. In addition, sudden hydrogen evolutions were sometimes identified in the SUS316L specimen with hydrogen gas charging during the deformation.

Effect of Strain Rate on Hydrogen Evolution during Deformation in Al-Zn-Mg Alloys

2012 ◽  
Vol 706-709 ◽  
pp. 295-300
Author(s):  
Keitaro Horikawa ◽  
Hiroyuki Yamada ◽  
Masahide Mutsuo ◽  
Hidetoshi Kobayashi
Keyword(s):  
Strain Rate ◽  
Grain Boundaries ◽  
Testing Machine ◽  
Hydrogen Gas ◽  
Mg Alloys ◽  
Second Phase ◽  
Gas Evolution ◽  
Hydrogen Atoms ◽  
Deformation And Fracture ◽  
The Moment

Hydrogen gas evolution behaviour during deformation and fracture in Al-Zn-Mg alloys with and without copper additions was examined by using a testing machine equipped with a quadrupole mass spectrometer in an ultrahigh vacuum chamber (QMS-UHV) and by a hydrogen microprint technique (HMT). The QMS-UHV testing revealed that hydrogen gas was evolved at the moment of grain boundary fracture, in particular. This suggested that hydrogen atoms primarily dissolved were trapped at the grain boundaries before the fracture. It was also revealed that hydrogen gas evolution behaviour was changed according to the testing strain rate. The HMT also revealed that silver particles, which represented the emission sites of hydrogen, were observed mainly around the second phase inclusions and the grain boundaries.

scholarly journals Hydrogen evolution behavior of tensile deformation process in 6061 and 7075 aluminum alloys

2011 ◽  
Vol 61 (7) ◽  
pp. 297-302 ◽  
Author(s):  
Hiroyuki Yamada ◽  
Keitaro Horikawa ◽  
Takeshi Matsumoto ◽  
Hidetoshi Kobayashi ◽  
Nagahisa Ogasawara
Keyword(s):  
Aluminum Alloys ◽  
Hydrogen Evolution ◽  
Deformation Process ◽  
Tensile Deformation ◽  
Evolution Behavior

Experimental and numerical analysis of high strain rate behavior of aluminum alloys AMg-6 and D-16

2006 ◽  
Vol 134 ◽  
pp. 487-491 ◽  
Author(s):  
A. V. Abramov ◽  
A. M. Bragov ◽  
A. K. Lomunov ◽  
A. Yu. Konstantinov ◽  
L. Kruszka ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Aluminum Alloys ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Rate Behavior ◽  
Strain Rate Behavior ◽  
High Strain Rate Behavior

scholarly journals Comparison in Deformation Behavior, Microstructure, and Failure Mechanism of Nickel Base Alloy 625 under Two Strain Rates

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2652
Author(s):  
Meng Liu ◽  
Quanyi Wang ◽  
Yifan Cai ◽  
Dong Lu ◽  
Tianjian Wang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Base Alloy ◽  
Inconel 625 ◽  
Tensile Fracture ◽  
Nickel Base Superalloy ◽  
Strain Rates ◽  
Tensile Fracture Surface ◽  
Nickel Base

Tensile deformation behavior and microstructure of nickel-base superalloy Inconel 625 are investigated under different strain rates of 5 × 10−4 s−1 and 5 × 10−5 s−1. According to the experimental results, yield strength and ultimate tensile strength of the alloy increase with the increase in strain rate in room temperature. Microstructure results indicate that the size of dimples is smaller in the tensile fracture surface at low strain rate than the high strain rate, and the number of dimples is also related to the strain rates and twins appear earlier in the specimens with higher strain rates. Apart from Hollomon and Ludwik functions, a new formula considering the variation trend of strength in different deformation stages is deduced and introduced, which fit closer to the tensile curves of the 625 alloy used in the present work at both strain rates. Furthermore, the Schmid factors of tensile samples under two strain rates are calculated and discussed. In the end, typical work hardening behavior resulting from the dislocations slip behavior under different strain rates is observed, and a shearing phenomenon of slip lines cross through the δ precipitates due to the movement of dislocations is also be note.

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