ausblenden:
Schlagwörter:
Chromium alloys; Cobalt alloys; Cracks; Entropy; Grain size and shape; High-entropy alloys; Iron alloys; Manganese alloys, Fatigue cracking; Grain size; Low cycle fatigues; Schmid factors; Slip band; Slip band spacing; Twin boundaries, Fatigue of materials
Zusammenfassung:
The fatigue cracking behavior at twin boundaries (TBs) in a CoCrFeMnNi high-entropy alloy with three different grain sizes was systematically investigated under low-cycle fatigue. Irrespective of grain size, the change from slip band cracking to TB cracking occurred with increasing the difference in the Schmid factors (DSF) between matrix and twin. However, the required critical DSF for the transition of the dominant cracking mode decreases with decreasing grain size due to the reduced slip band spacing that increases the impingement sites on the TBs and facilitates the coalescence of defects and voids to initiate TB cracks. © 2019
