The dependency of anisotropic flow behaviour on crystallographic texture is investigated in Ti–6Al–4V alloy at 750 °C and 900 under constant strain rates 10?2, 10?3 2 × 10?4 s?1. evolution microstructure during these test conditions has been studied using electron backscatter diffraction (EBSD). Anisotropic stress was observed irrespective the applied rate. maximum this temperature recorded for...

The flow behavior of a Ti-6Al-4V alloy has been investigated and modeled, with the aim exploring damage mechanism distortion sandwich structure during air cooling process after superplastic forming (SPF). selected temperature range was 930–700 °C, strain rates were 10?2, 10?3, 10?4/s. An Arrhenius model employed to describe yield stress at 0.1, simple generalized reduced gradient refinement app...

This paper presents the tensile deformation behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass in supercooled liquid region. Isothermal tensile tests are carried out at four characteristic temperatures of 616K, 636K, 656K and 676K which are in the range from glass transition onset temperature to crystallization temperature. The results show that the superplastic flow behaviors of th...

H13 steel is a widely used hot work die material. A new type of hot working method is imperative to develop complex and precise dies. In this paper, the heat treatment of H13 steel (AISI) was carried out by annealing, the final structure is a point or spherical pearlite, and the grain size is about 30-40 μm. The tensile properties of the annealed microstructure were investigated at 650, 750, an...

Deformation under the combined action of external stress and cyclic hydrogen charging/discharging is studied in a model material, titanium. Cyclic charging with hydrogen is carried out at 860 °C, which repeatedly triggers the transformation between hydrogen-lean -Ti and hydrogen-rich -Ti. Due to bias from the externally applied tensile stress, the internal mismatch strains produced by this isot...

Plastic relaxation of carbon nanotubes under tension and at high temperature is described in terms of dislocation theory and with atomistic computer simulations. It is shown how the glide of pentagon-heptagon defects and a particular type of their pseudoclimb, with the atoms directly breaking out of the lattice, work concurrently to maintain the tube perfection. Derived force diagram quantifies...

A front automobile fender with a negative angle was trial produced via rapid superplastic forming (SPF) technology. The tensile test of industrial AA5083 carried out at elevated temperatures, and the results showed that maximum elongation 242% 480 °C/0.001 s−1. rigid-plastic constitutive model SPF process established. Initial dies preforming final were designed. finite element method (FEM) used...