Very high strain hardening coefficients (=G/23) are observed for aluminum-alloyed face-centered cubic Hadfield steel single crystals under tensile loading. Alloying with aluminum suppressed deformation twinning in two of the three crystallographic orientations studied, and transmission electron microscopy results revealed the existence of dense dislocation walls (sheets) along crystallographic ...

The deformation microstructure of face-centered cubic cobalt subjected to surface mechanical attrition treatment was studied as a function of strain levels. Strain-induced c ! e transformation and twinning deformation were evidenced by transmission electron microscopy and were found to progress continuously in ultrafine and nanocrystalline grains as the strain increased. 2004 Acta Materialia In...

In this study, the microstructure and the mechanical properties of two new biocompatible superelastic alloys, Ti-24Nb-0.5O and Ti-24Nb-0.5N (at.%), were investigated. Special attention was focused on the role of O and N addition on α(″) formation, supereleastic recovery and mechanical strength by comparison with the Ti-24Nb and Ti-26Nb (at.%) alloy compositions taken as references. Microstructu...

In this work, plastic deformation was locally introduced at room temperature by nanoindentation on a γ-TiAl-based alloy. Comprehensive analyses of microstructures were performed before and after deformation. In particular, the Burgers vectors, the line directions, and the mechanical twinning systems were studied via accurate electron channeling contrast imaging. Accommodation of the deformation...

The deformation of copper single crystals at 4.2 K occurs by a sequence of slip, twinning and slip in the twinned structure. Subsequent annealing of the deformed structures obtained at various points at this sequence of deformation permits the detailed nature of the deformed and recrystallized states to be related in a unique fashion. Material recrystallized from structures obtained prior to th...

Deformation experiments were conducted with the intention of identifying how the mechanical behavior and deformation microstructures of a basalt are influenced by the presence of glass that can crystallize to metamorphic minerals or flow. A glassy plagioclase-rich basalt was tested for periods of up to 649 hours at temperatures of 675-875°C, a confining pressure of 1.0 GPa, and strain rates of ...

In order to investigate deformation history preserved in the calcite twins in the hinterland of Zagros, several samples have been collected from calcschists of the Paleozoic Sargaz complex in the Faryab area, SE Iran. These samples are related to F1-recumbent folding and thrust shear zones. The twin width is about 1 and 3.8 µm (thin-twin regime); the twin strain amounts 5 and 10%; twin intensit...

In this work, plastic deformation was locally introduced at room temperature by 12 nanoindentation on a γ-TiAl based alloy. Comprehensive analyzes of microstructures were 13 performed before and after deformation. In particular, the Burgers vectors, the line directions and 14 the mechanical twinning systems were studied via accurate electron channeling contrast imaging. 15 Accommodation of the ...

The critical parameters for the structural stability of physical vapor deposited TiN film on (112̄0) sapphire were investigated by analyzing the adhesion strength and failure mechanism through in situ observations of the fracture sequence during scratch tests and static normal indentation. TiN was deposited by arc ion plating on (112̄0) sapphire, and the thickness of the TiN film was controlled t...