Effect of Dynamically Recrystallized Grain Size on the Tensile Properties and Vibration Fracture Resistance of Friction Stirred 5052 Alloy

Abstract

5052H34 Al-Mg plates were annealed and then friction stir processed at various rotation speeds ranging from 500 to 1500 rpm to investigate the tensile properties and vibration fracture resistance. The experimental results indicate that grain refinement could be observed at the stir zone with an average grain size varying from 5-16 mm. Based on the observed microstructure and tensile deformation resistance data, the k y slope value of the Hall-Petch equation can be determined. A refined grain size in the stir zone is a common feature of the friction stirred specimens. Different rotation speeds have different corresponding grain sizes and this can be attributed to dynamic recrystallization during friction stir processing (FSP). The effect of grain size on vibration fracture resistance in the stir zone was also examined. Results show that the vibration fracture resistance of the stir zone decreases with increasing the rotation speed. An increase in grain size due to higher rotation speed is detrimental to the vibration propagation resistance, and a small variation in grain size can result in significant changes in the duration of stage I of the D-N curves. The inward crack propagation behavior was found to be the main controlling factor on vibration fracture resistance. This result agrees with the variation in crack propagation rate.

Influence of Pre-Deformation of 5052H112 Alloy on Tensile Properties and Fracture Resistance under Vibration

“…The slip bands in the vicinity of the main crack decreased with increasing rolled reduction. Our previous study confirmed that 18) a small grain size can increase vibration fracture resistance resulting from plastic deformation in the vicinity of the main crack. According to abovementioned observations, it is reasonable to suggest that the cold rolling plays an important role in affecting vibration propagation behavior.…”

Microstructural Variation and Tensile Properties of a Cast 5083 Aluminum Plate via Friction Stir Processing

“…Particularly, when FSW utilized in tailor weld blanks, a post-weld deformation such as pressing and bending works is inevitable. Friction stir processing (FSP), [12][13][14] which is essentially similar to FSW, can be applied to surface modification or a specific local areas of components where better mechanical properties are required. As it has been developed based on basic concept of FSW, this process is often utilized to refine the grain size or to homogenize the heterogeneous intermetallic solidification precipitates.…”

Effect of Revolutionary Pitch on the Microhardness Drop and Tensile Properties of Friction Stir Processed 1050 Aluminum Alloy

“…2(a)) clearly shows that the smaller revolutionary pitch (V/N) caused the microhardness to drop in the vicinity of RS. Based on previous investigations, 17,18) the FSPed specimens are commonly characterized by a fair number of retained dislocations and finer substructures within DRXed grains. The DRX related features of both the SZ and the TMAZ are related to the degree of temperature caused by FSP heat inputs.…”