Temperature dependency of cyclic deformation behavior of Cu-SiO2 single crystal

Miura, Hiromi; Kotani, Kenichi; Sakai, Taku

doi:10.1016/s1359-6454(00)00377-3

Cited by 3 publications

(2 citation statements)

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“…Below this critical cooling rate, higher cooling rates result in finer grain sizes. Combined with the results of the work of Miura et al, [26][27][28][29][30][31] it is reasonable to conclude that the fracture after fatigue erosion is a very important dendrite fragmentation mechanism in the grain refinement of semisolid slurry.…”

Section: Discussionmentioning

confidence: 68%

“…Cracks initiate on the surfaces where stress concentrations occur, and will propagate with the help of these stress concentrations. Miura et al [26] have investigated the low-frequency fatigue of Cu-SiO 2 single crystals deformed at temperatures up to 673 K with a frequency of 1.2 ϫ 10 Ϫ3 Hz and a strain amplitude of Ϯ0.0025. Wei␤ and Gottstein [27] have investigated the low-frequency fatigue of Al bicrystals deformed at temperatures up to 573 K with a frequency of 1.3 ϫ 10 Ϫ2 Hz and a strain amplitude of Ϯ0.01.…”

Section: A Model Of Fracture After Fatigue Erosionmentioning

confidence: 99%

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Microstructural stress concentration: An important role in grain refinement of rheocasting structure

Yang

Kang

2005

Metall Mater Trans A

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Though the mechanisms of dendrite fragmentation in agitated solidification are of great importance and have been investigated for many years, no accurate calculation of the stress fields of dendrites stirred in the metallic flow has been reported. In this study, the stress field and strain field of an aluminum dendrite model in moderate agitated fluid were calculated using the finite-element method. It was found that the stress concentrations at the roots of dendrite branches are so great that plastic deformation occurs when the fluid force is far from sufficient to bend the dendrite branches plastically. According to this calculation, a mechanism, detaching after fatigue erosion, was suggested. The new mechanism suggests that stress concentrations at the roots of dendrite branches create slip band intrusions and extrusions. These slip band intrusions and extrusions are thermally unstable and are soon remelted. If the erosion rate of the roots is sufficiently large, the roots will be thinned and dendrite branches will detach. Experiments on the effects of stirring intensity, cooling rate, and stirring time on the grain sizes of the A356 rheocasting structure, and reported high-temperature fatigue tests, corroborate the effectiveness of the new mechanism.

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