8 Abstract 9 Application of electron backscattering diffraction methods to recover estimates of the geometrically necessary dis-10 location density is described. The limitations of the method arising from the opacity of crystalline materials and the 11 spatial and angular resolution limits are discussed. 15 It has long been an experimental observation 16 that the constituent grains of polycryst...

Nanocrystalline (NC) metals with grain sizes <100 nm have attracted a lot of attention in the materials science fi eld for more than a few decades because of their ultra-high strength and hardness. Various experimental and computational studies indicate that dislocation-mediated plasticity prevails in NC metals when the grain size is larger than ~10 nm. Recent molecular dynamics (MD) simulation...

This paper reported the results of research into effect Equal Channel Angular Pressing (ECAP) temperature and 1-h annealing on mechanical properties, stress-relaxation resistance, corrosion resistance austenitic steel AISI 321L with strongly elongated thin δ-ferrite particles in its microstructure. The formation α′-martensite fragmentation austenite grains takes place during ECAP. Ultrafine-gra...

Magnesium (Mg) and its composites have been widely used in different fields, but the mechanical properties deformation mechanisms of polycrystalline Mg (polyMg) at atomic scale are poorly understood. In this paper, effects grain size, temperature, strain rate on tensile polyMg explored discussed by Molecular dynamics (MD) simulation method. The calculated results showed that there exists a crit...

It is well known that each thruster on the SPHERE produces slightly different thrust and behaves differently (see [Chen] and [Berkovitz]). Some methods were developed by [Chen] to compensate for the difference in thrust between thrusters and improve the open-loop performance of the SPHERE, but they were yet to be demonstrated. An experiment was performed onboard NASA’s KC-135, during microgravi...

For fixed n and k, we find a three-variable generating function for the set of sequences (λ1, . . . , λn) satisfying k ≥ λ1 a1 ≥ λ2 a2 ≥ . . . ≥ λn an ≥ 0, where a := (a1, . . . , an) = (1, 2, . . . , n) or (n, n − 1, . . . , 1). When k → ∞ we recover the refined anti-lecture hall and lecture hall theorems. When a = (1, 2, . . . , n) and n → ∞, we obtain a refinement of a recent result of Chen,...

Purpose of the work is related with impossibility correctly estimating strain hardening metals (alloys) in area their large total deformations due to absence additivity traditionally used value engineering g, its nonlinear change values, and data technical literature Hall-Petch coefficient Ai for logarithmic true deformations, which led task correct transition from values 0 &lt; g 50...60 % str...