In this study, AZ91 magnesium alloy rods were used to investigate the effects of torsion deformation on microstructure and subsequent aging behavior. Extruded AZ91 rod has a uniform microstructure and typical fiber texture. Torsion deformation can generate a gradient microstructure on the cross-section of the rod. After torsion, from the center to the edge in the cross-section of the rod, both ...

The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited twinning types abundant during deformation. Local strain accommodations among considered to shed light variant rules Ti Mg alloys. Five kinds discussed terms different regions that affected by the shear primary twin. These contain (I) whole sample, (II...

Aerospace engine is the source of power for development national defense and aerospace. Engine bolt tightening an important part aerospace production process. At present, most methods engines are manual or traditional rigid tightening, which lead to problem low efficiency large deformation. This paper proposes a process planning method based on digital twin, including flexible mechanism design,...

Deformation twinning evolution from a single crystal is conducted by molecular dynamics simulations, to elucidate a twinned face-centered-cubic alloy in an experiment with hardness up to 100 times as that of single crystals, and with ductility simultaneously. Critical twinning stress of cadmium zinc telluride (CdZnTe or CZT) calculated is 1.38 GPa. All the twin boundaries are along the (11-1) o...

∑ 3{111} coherent twin boundary (CTB) in face-centered-cubic (FCC) metals and alloys have been regarded as an efficient way to simultaneously increase strength and ductility at the nanoscale. Extensive study of dislocation-CTB interaction has been carried out by a combination of computer simulations, experiments and continuum theory. Most of them, however, are based on the perfect CTB assumptio...

In this STIR we proposed to investigate the microstructure and alloy composition on the formation and stability of nanotwinned microstructures. The long-term alloy design strategy focuses on microalloying additions to 1) reduce the stacking fault energy (SFE), enhance twinning formation, and increase twin volume fraction; 2) reduce the twin size via increasing interstitial content while also ta...

An AM30 magnesium alloy was processed through ECAP method at 200 °C. Optical and transmission electron microscopy as well as electron back scattered diffraction (EBSD) technique were employed to characterize the deformed microstructure. A partially recrystallized microstructure including ultrafine/nano structures was obtained. The area fraction of 49% was measured for the recrystallized regions...

The mechanism of radiation-induced detwinning is different from that of deformation detwinning as the former is dominated by supersaturated radiation-induced defects while the latter is usually triggered by global stress. In situ Kr ion irradiation was performed to study the detwinning mechanism of nanotwinned Cu films with various twin thicknesses. Two types of incoherent twin boundaries (ITBs...