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

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.

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

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

Fundamental Research on Fatigue Properties of Closed-Packed Hexagonal Lattice Metal under Biaxial Stress

2007 ◽  
Vol 561-565 ◽  
pp. 167-170
Author(s):  
Yasumi Ito ◽  
Akira Shimamoto ◽  
Tetsuya Nemoto ◽  
Kazuharu Koide ◽  
Akira Inamori ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Assisted Living ◽  
Stress Ratio ◽  
Hexagonal Lattice ◽  
Medical Implants ◽  
Biaxial Load ◽  
Joint Prostheses

Assisted living instruments and medical implants, such as wheelchairs and joint prostheses are usually subjected to biaxial or three-axial stresses instead of uniaxial stress. So, authors already developed a servo biaxial fatigue-testing machine, and clarified about the performance evaluation. Moreover, closed-packed hexagonal lattice metal, such as magnesium and titanium, is frequently used for assisted living instruments or medical implants. In this research, fatigue crack propagation tests of magnesium alloy AZ31B and pure titanium TP340C were conducted under conditions of biaxial and uniaxial loading by using a cruciform specimen in a bi-axial fatigue machine, in order to investigate the effect of non-singular stress cycling on the fatigue crack growth properties ⊿K-da/dN. From these comprehensive experiments, in the magnesium alloy, the re-markable effect was found in the specific biaxial load stress ratio on ⊿K-da/dN relation. When biaxial load stress ratio was 0.5, it turned out that the fatigue crack propagation rate of a magnesium alloy becomes very slow. On the other hand, in the titanium, it was confirmed that there is a little influence of a biaxial load stress ratio on ⊿KⅠ -da/dN relation.

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