OS1512 Fatigue crack propagation behaviour of AZ61 magnesium alloy under controlled cathodic potential

2013 ◽  
Vol 2013 (0) ◽  
pp. _OS1512-1_-_OS1512-3_
Author(s):  
Tomonori TANIGUCHI ◽  
Yoshihiko UEMATSU ◽  
Yuji HATANO ◽  
Toshifumi KAKIUCHI ◽  
Masaki NAKAJIMA ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Cathodic Potential ◽  
Az61 Magnesium Alloy

Effect of Temperature and Relative Humidity on Fatigue Crack Propagation Behavior of AZ61 Magnesium Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 409-412 ◽  
Author(s):  
Rong Chang Zeng ◽  
En Hou Han ◽  
Wei Ke
Keyword(s):  
Fatigue Crack ◽  
Elevated Temperature ◽  
Magnesium Alloy ◽  
Relative Humidity ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Fatigue Crack Initiation ◽  
Effect Of Temperature ◽  
Transgranular Fracture ◽  
Az61 Magnesium Alloy

The fatigue crack propagation (FCP) behavior of magnesium alloy AZ61 at room temperature (RT), elevated temperature (60°C, 120°C) , and in ambient and wet air was investimated. The mechanisms of FCP were discussed in detail. It was demonstrated that The FCP rate of AZ61 magnesium alloy increased with increasing temperature and relative humidity (RH). Obvious change in the microstructure occurred during fatigue at elevated temperature, particularly at 120°C, compared to its original microstructure. Grain growth, deformation twin, grain boundary (GB) immigration and precipitates were observed in the microstructure at 120°C after fatigue. A bend occurred in the curves of FCP rate versus stress intensity factor at 120°C, which corresponded to a transition of failure mode from a mixed intergranular and transgranular fracture to a transgranular fracture. At first stage, the FCP rate increased sharply, and then went up slowly due to the growth of grain size. Secondary phase particles facilitated the fatigue crack initiation. The Hydrogen embrittlement (HE) may be primarily responsible for accelerating FCP rate in wet air.

Fatigue crack propagation of AZ61 magnesium alloy under controlled humidity and visualization of hydrogen diffusion along the crack wake

2014 ◽  
Vol 59 ◽  
pp. 234-243 ◽  
Author(s):  
Yoshihiko Uematsu ◽  
Toshifumi Kakiuchi ◽  
Masaki Nakajima ◽  
Yuki Nakamura ◽  
Satoshi Miyazaki ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Hydrogen Diffusion ◽  
Crack Wake ◽  
Az61 Magnesium Alloy

Environmental effect of fatigue crack propagation of magnesium alloy

1997 ◽  
Vol 234-236 ◽  
pp. 220-222 ◽  
Author(s):  
Yasuo Kobayashi ◽  
Toshinori Shibusawa ◽  
Keisuke Ishikawa
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Environmental Effect

Fatigue Crack Propagation Behavior of AZ61 Magnesium Alloy under Controlled Cathodic Potential

2014 ◽  
Vol 891-892 ◽  
pp. 917-922 ◽  
Author(s):  
Tomonori Taniguchi ◽  
Yoshihiko Uematsu ◽  
Yuji Hatano ◽  
Toshifumi Kakiuchi ◽  
Masaki Nakajima ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
X Ray Diffraction ◽  
Hydrogen Atoms ◽  
Cathodic Potential ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Corrosion Reaction ◽  
Diffusion Of Hydrogen

In the present study, fatigue crack propagation (FCP) tests on Mg alloy, AZ61, were performed in 3% NaCl solution. The cathodic potential was controlled to achieve the hydrogen charged condition without anodic dissolution to figure out the effect of hydrogen on FCP behavior. The cathodic potential was set to be-3.0V, which corresponds to the immunity region without corrosion reaction based on Pourbaix diagram of Mg. The FCP rates were accelerated under hydrogen charged condition compared to those in dry air. Magnesium hydrides, MgH2, were not detected along the crack wake in the measurement by X-ray Diffraction (XRD) method, suggesting that the acceleration could be attributed to the diffusion of hydrogen atoms.

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