High-Cycle Fatigue Crack Growth Properties of Aramid-Reinforced Aluminum Laminates

2009 ◽  
pp. 637-637-16 ◽  
Author(s):  
SE Stanzl-Tschegg ◽  
M Papakyriacou ◽  
HR Mayer ◽  
J Schijve ◽  
EK Tschegg
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Growth Properties

scholarly journals Effect of Tailored Microstructures in CaO-Added AZ31 Extrusion Material on Tensile, High Cycle Fatigue and Fatigue Crack Propagation Properties

2021 ◽  
Vol 59 (6) ◽  
pp. 365-373
Author(s):  
Young-Kyun Kim ◽  
Min-Jong Kim ◽  
Yu-Jin Hwang ◽  
Shae. K. Kim ◽  
Hyun-Kyu Lim ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Growth Property ◽  
Average Grain Size ◽  
Growth Properties ◽  
Elongation To Failure ◽  
Propagation Properties

The effect of tailored microstructures in 0.5 wt% CaO added AZ31 on tensile, high-cycle fatigue, and fatigue crack growth properties was examined. By adding CaO, the average grain size (AGS) was significantly reduced from 4.25±2.32 μm (conventional AZ31) to 2.42±1.60 μm (CaO-AZ31). The fineprecipitates of CaO-AZ31 were more evenly distributed and their fraction was higher than those of conventional AZ31. The fine-precipitates were identified as Al8Mn4Ca and (Mg, Al)2Ca in CaO-AZ31, meanwhile, were identified as Al8Mn5 and Mg17Al11 in conventional AZ31. The tensile test results showed that the yield strengths of CaO-AZ31 and conventional AZ31 were 238.0 MPa and 206.7 MPa, respectively. The elongation-to-failure also increased when CaO was added. The improved tensile properties of CaO-AZ31 could be explained by grain refinement and precipitation hardening. The high-cycle fatigue limit also increased about 15% with added CaO. The fatigue limits as a function of the tensile strengths of CaO-AZ31 and conventional AZ31 were 0.508 and 0.457, respectively. The origin of the improved fatigue resistance was attributed to inhibition of the formation of DTs, which acted as the fatigue crack source, in CaO-AZ31. In contrast, the fatigue crack growth property did not change when CaO was added. Based on the above findings, the relationships between microstructure, mechanical properties and deformation mechanisms are also discussed.

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