About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
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Symposium
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12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
|
Presentation Title |
Quantification of Cyclic Twinning-detwinning Behavior During Low-cycle Fatigue of Unalloyed Mg and a Mg-Al Alloy Using High Energy X-ray Diffraction |
Author(s) |
Aeriel D. Murphy-Leonard, Darren Pagan, Armand Beaudoin, Matthew Miller, John Allison |
On-Site Speaker (Planned) |
Aeriel D. Murphy-Leonard |
Abstract Scope |
The cyclic twinning and detwinning behavior of unalloyed Mg and a Mg-Al alloy was investigated using in-situ high energy X-ray diffraction (HEXD) under displacement controlled, fully-reversed low cycle fatigue conditions. Measurements were conducted at three levels of applied strain. At strain amplitudes greater than 0.5%, tension-compression asymmetry was observed during cyclic loading and related to cyclic twinning and detwinning. The twinning and detwinning behavior were characterized by monitoring the evolution of X-ray diffraction peaks associated with the basal {0002} planes throughout selected cycle. At strains greater than 0.5%, in-situ HEXD results show that twinning occurs during the compression portion of the cycle and, at early stages of fatigue, most twins are detwinned under reversed loading during the tensile portion of the cycle. After a number of fatigue cycles, the detwinning process was observed to be incomplete and residual twins remained throughout an entire cycle. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |