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FIB/SEM applied to quantitative 3D analysis of precipitates in Ni-Ti University of Antwerp

Shanshan Cao, Minoru Nishida, Nick Schryvers
Ni4Ti3 precipitates with a heterogeneous distribution growing in a polycrystalline Ni50.8Ti49.2 alloy have been investigated in a Dual-Beam FIB/SEM system. The volume ratio, mean volume, central plane diameter, thickness, aspect ratio and sphericity of the precipitates in the grain interior as well as near to the grain boundary were measured or calculated. The morphology of the precipitates was classified according to the Zingg scheme. The ...

Quantitative FIB/SEM three-dimensional characterization of a unique Ni₄Ti₃ network in a porous Ni50.8Ti49.2 alloy undergoing a two-step martensitic transformation University of Antwerp

S. Cao, C.Y. Zeng, Y.Y. Li, Xiayang Yao, X. Ma, Vahid Samaeeaghmiyoni, Nick Schryvers, X.P. Zhang
The three-dimensional (3D) nanostructure of Ni4Ti3 precipitates in a porous Ni50.8Ti49.2 alloy has been re-constructed by "Slice-and-View" in a Focused Ion Beam/Scanning Electron Microscope (FIB/SEM). The 3D configuration of these precipitates forming a network structure in the B2 austenite matrix has been characterized via 3D visualization and quantitative analysis including volume fraction, skeleton, degree of anisotropy and local thickness. ...

3D reconstruction of $Ni_{4}Ti_{3}$ precipitates in a $Ni_{51}Ti_{49}$ alloy in a FIB/SEM dual-beam system University of Antwerp

Shanshan Cao, Wim Tirry, Wouter Van den Broek, Nick Schryvers
Ni4Ti3 precipitates play an important role in the shape memory and superelastic behaviour of thermo-mechanically treated Ni-Ti material. The 3D morphology and distribution of such precipitates with lenticular shape and rhombohedral atomic structure in the austenitic B2 matrix of a binary Ni-rich Ni-Ti alloy has been elucidated via a slice & view procedure in a Dual-Beam FIB/SEM system. With the sequence of cross-section SE images obtained ...

Three-dimensional observation and analysis of remineralization in dentinal caries lesions KU Leuven

Bart Van Meerbeek
The remineralization mechanism in dental caries lesions is not completely understood. This study reports on ultrastructural and chemical changes observed within arrested caries lesions. Carious human teeth were observed using scanning electron microscopy (SEM) and focused-ion-beam (FIB)-SEM. The crystals detected in the caries lesions were characterized by transmission electron microscopy (TEM), along with chemical element mapping using ...

Microstructural investigation of irradiation assisted stress corrosion cracking mechanisms based on focused ion beam analysis of tested and industrial specimens University of Antwerp

Aäron Penders
Irradiation assisted stress corrosion cracking (IASCC) is an intergranular cracking effect which can occur in heavily irradiated internal structural components of nuclear reactor cores. It is a complex phenomenon which is not yet fully understood because it occurs through an interplay of several material degradation processes. The factors that influence IASCC susceptibility include irradiation damage (neutrons and other irradiation particles ...

Novel Failure Analysis Techniques for 1.8 μm Pitch Wafer-to-Wafer Bonding KU Leuven

C Schmidt, L Lechner, Ingrid De Wolf, SW Kim, E Beyne
© 2018 IEEE. In this paper, different methods and novel tools for non-invasive failure localization and high-resolution material analysis in cutting edge wafer-to-wafer bonded devices will be discussed. The presented techniques combine non-invasive imaging of the internal device build up and accurate target preparation to gain access to the region of interest. The presented concepts include 3D X-ray microscopy as well as 3D FIB-SEM tomography in ...

Dealloying-driven local corrosion by intermetallic constituent particles and dispersoids in aerospace aluminium alloys Vrije Universiteit Brussel

Ali Kosari, Frans Tichelaar, Peter Visser, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

Nanoscopic characterization of heterogeneous intermetallic particles (IMPs) which microstructurally and compositionally evolve during local corrosion is crucial in unravelling the mechanisms and sequence of initial and local corrosion events. Herein, we study site-specific initiation events focused on microscopic constituent intermetallic compounds and nanoscopic dispersoids in AA2024-T3 at the nanoscale using a combined quasi in-situ and ...

Impact of sandblasting on the flexural strength of highly translucent zirconia KU Leuven

Jef Vleugels, Bart Van Meerbeek, Fei Zhang
The objective of this study was to assess the influence of alumina sandblasting on the flexural strength of the latest generation of highly translucent yttria partially stabilized dental zirconia (Y-PSZ). Fully-sintered zirconia disk-shaped specimens (14.5-mm diameter; 1.2-mm thickness) of four Y-PSZ zirconia grades (KATANA HT, KATANA STML, KATANA UTML, all Kuraray Noritake; and Zpex Smile, Tosoh) were sandblasted at 0.2 MPa with 50-μm ...

Laterally-resolved formation mechanism of a lithium-based conversion layer at the matrix and intermetallic particles in aerospace aluminium alloys Vrije Universiteit Brussel

Ali Kosari, Frans Tichelaar, Peter Visser, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

Lithium leaching coatings have recently been developed as eco-friendly active corrosion protection technology for aerospace aluminium alloys (AAs) by the formation of a conversion layer at coating defects. While general conversion layer formation characteristics were studied and reported before, here we study the local layer formation process with sub-micron resolution at and around intermetallic particles (IMPs) in AA2024-T3. Top- and ...