Evolution of stress in individual grains and twins in a magnesium alloy aggregate.
This is an in situ measurement of the full stress tensor and its evolution in a growing deformation twin and, simultaneously, in the grain where the twin forms. The combined information provides a detailed picture of the grain-twin interaction. The three-dimensional x-ray diffraction method using 80.7 keV synchrotron x rays allows us to in situ investigate a grain within the bulk of a magnesium alloy (AZ31) sample that is compressed to activate the {l_brace}10{bar 1}2{r_brace} <{bar 1}011> tensile twin system. We observe that the stress state of the twin is drastically different from the one of the grain in which it is embedded. We analyze such result in terms of the shear transformation associated with twinning and the dimensional constraints imposed by the surrounding aggregate.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 962894
- Report Number(s):
- ANL/XSD/JA-64601; TRN: US0902964
- Journal Information:
- Phys. Rev. B, Vol. 80, Issue Jul. 2009; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Elastic strain evolution and {epsilon}-martensite formation in individual austenite grains during in-situ loading of a metastable stainless steel.
Evolution of twinning in extruded AZ31 alloy with bimodal grain structure