A simple approach based on centroidal Voronoi tessellation (CVT) is proposed here to create three-dimensional microstructures, for crystal plasticity finite element (CPFE) simulations. In the proposed approach, the grain morphology for any given specimen geometry is created with a predetermined grain size. Instead of using the conventional way that generates the Voronoi cells first and then mes...

Effect of crystallographic orientation nucleus on discontinuous dynamic recrystallization (DDRX) behavior in 304LN stainless steel is investigated using a multiscale model, namely coupled crystal plasticity finite element method and DDRX-based cellular automata model. The three selection schemes are specially exploited the simulation; i.e., (1) random orientation, (2) inheritance parent deforme...

Formation of stray grain defects particularly around re-entrant features of the turbine blade airfoils is one of the major problems in directional and single crystal solidification processes. In this work, directional solidification tests of the GTD-111 Ni-based superalloy were conducted at different withdrawal velocities of 3, 6 and 9 mm.min-1 using various stepped cylindrical and cubic design...

A novel method is presented for growth of polycrystalline silicon films on amorphous substrates at temperatures of 540-575 “C. Grain nucleation and grain growth are performed in two steps, using Si nanocrystals as nuclei (“sceds’“,L The nanocrystal seeds are produced by excimer laser photolysis of disilane in a room temperature flow cell. Film (grain) growth occurs epitaxially on the seeds in a...

This paper studied the behaviors of sintering between Ag nanoparticle (NP) and nanoflake (NF) in same size by molecular dynamics simulation. Before simulation, melting simulation NF was carried out to calculate points NFs investigate thermostability NF. The Lindemann index potential energy showed that were significantly size-dependent. During heating process, sharp corner transformed round coul...

It is shown that the size effect recently observed by Espinosa et al., fJ. Mech. Phys. Solids 51, 47 s2003dg in pure tension tests on free thin metallic films can be explained by the existence of a boundary layer of fixed thickness, located at the surface of the film that was attached onto the substrate during deposition. The boundary layer is influenced by the epitaxial effects of crystal grow...

High-resolution three-dimensional crystal plasticity simulations are used to investigate deformation heterogeneity and microstructure evolution during cold rolling of interstitial free (IF-) steel. A Fast Fourier Transform (FFT)-based spectral solver is conduct using a dislocation-density-based model. The in-grain texture misorientation spread consistent with experimental results obtained elect...

Crack initiation in Ti-6242 has been observed to occur in a grain with a hard orientation for basal slip neighbouring a grain with a soft orientation. Because there is significant variability in microstructural features and crack initiation life, it is useful to explore the effects of the variability of the microstructural components through a probabilistic sensitivity analysis. In this paper, ...

Focusing on nanocrystalline (nc) pure face-centered cubic metals, where systematic experimental data are available, this paper presents a brief overview of the recent progress made in improving mechanical properties of nc materials, and in quantitatively and mechanistically understanding the underlying mechanisms. The mechanical properties reviewed include strength, ductility, strain rate and t...