Deposition of material at grain boundaries in tension interpreted in terms of diffusional creep

Effect of Prior-Heat Treatments on the Creep Behavior of an Industrial Drawn Copper

“…The creep behavior of industrial metals is even more complicated. The mechanism responsible for the creep is driven by several parameters such as variation of grain shape [2], grain size distribution [3], grain growth [4] and complex twin/CSL boundary structure [5]. Additional complications such as inert precipitate and particle accumulation at grain boundaries in alloys [6] make theoretical interpretation of the creep data more difficult.…”

Measurement of the components of plastic displacement gradients in three dimensions

“…This so-called Algebraic Reconstruction Technique (ART) was first published in the biomedical imaging literature in 1970 [11]. The set of linear equations can be written as WV=P or in expanded form as (2) where V is the unknown column vector storing the values of all the voxels in the reconstructed n × n × n grid. P is composed of the values of the pixels in the combined set of all M projection images recorded at different angles and W is the weight matrix in which an element w ij represent a measure of the influence that particular voxel has on the ray that ends up in a particular pixel on the detector.…”

“…Depending on the deformation process and the material there can be local plastic strain variations down to the µm-scale, which are important for the mechanical properties of the material. Spatial variations in plastic deformation have mainly been studied experimentally by observing scratches, etch patterns or grids placed on the surface [1][2][3][4][5][6]. The spatial resolution of these methods depends on the size and the distance between recognizable features before and after a given deformation increment.…”

Microstructural evolution of Mg–Al–Ca–Sr alloy during creep

“…With dendritic structures, it is critical to distinguish between secondary dendrite arm boundaries and random, high angle grain boundaries between dendrites. It has been suggested that high angle grain boundaries are more susceptible to diffusional creep and grain boundary sliding [8,9], thus it is likely that creep damage will occur at high angle grain boundaries rather than secondary dendrite arm boundaries. Confusion arises because many of the past studies on the creep of magnesium alloys have simply referred to any dendrite arm boundary with intermetallic particles as grain boundaries, irrespective of their crystallographic misorientation e.g.…”