The five-parameter grain boundary character and energy distributions of a fully austenitic high-manganese steel using three dimensional data

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• 作者：Hossein Beladi^a ; ^{hossein.beladi@deakin.edu.au" class="auth_mail} ; Noel T. Nuhfer^b ; Gregory S. Rohrer^b
• 关键词：Grain boundary energy ; Microstructure ; TWIP steel ; Electron backscattering diffraction ; Focused ion beam
• 刊名：Acta Materialia
• 出版年：15 May, 2014
• 年：2014
• 卷：70
• 期：Complete
• 页码：281-289
• 全文大小：2483 K

文摘

The three-dimensional interfacial grain boundary network in a fully austenitic high-manganese steel was studied as a function of all five macroscopic crystallographic parameters (i.e. lattice misorientation and grain boundary plane normal) using electron backscattering diffraction mapping in conjunction with focused ion beam serial sectioning. The relative grain boundary area and energy distributions were strongly influenced by both the grain boundary plane orientation and the lattice misorientation. Grain boundaries terminated by (1 1 1) plane orientations revealed relatively higher populations and lower energies compared with other boundaries. The most frequently observed grain boundaries were {1 1 1} symmetric twist boundaries with the 危3 misorientation, which also had the lowest energy. On average, the relative areas of different grain boundary types were inversely correlated to their energies. A comparison between the current result and previously reported observations (e.g. high-purity Ni) revealed that polycrystals with the same atomic structure (e.g. face-centered cubic) have very similar grain boundary character and energy distributions.