Retracted: Effect of High‐Energy Electropulsing on the Phase Transition and Mechanical Properties of Two‐Phase Titanium Alloy Strips

Abstract

The effect of high-energy electropulsing treatment (EPT) on the phase transition and mechanical properties of the two-phase Ti-6Al-4V alloy strips (in the solid solution state) was studied with the help of uniaxial tensile machine, X-ray diffraction, optical stereo-microscope, scanning electron microscope, and electrical resistance meters. Results show that the ductility of the titanium alloy strips under EPT could be enhanced remarkably at most by 225% while keeping the tensile strength nearly unchanged. EPT facilitates b-Ti phase precipitation noticeably with increasing percentage of the b phase and the average size of the b phase. In addition, precipitated b phase gathers coarsening, forms into continuous strips and migrates from the interior grains to the inter-granular regions transforming the wormlike microstructure into the equiaxed microstructure. The mechanism for rapid phase change during EPT is put forward with increasing the nucleation rate of the a ! b phase transformation and accelerating the diffusion flux of vanadium atoms under the coupling of the thermal and athermal effects. Therefore, a highly efficient aging treatment method for titanium alloys is provided to prepare advanced engineering materials with outstanding mechanical properties, which can be widely applied in the aerospace and biomedical fields.

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

“…Ye et al revealed that the precipitated β-Ti from Ti-6Al-4V (α + β) alloy gathered and formed continuous strips and migrated from inside worm-like particles to an equiaxed grain area after EPT in a very short duration, for which it was assumed that the nucleation rate of the phase transition α → β was accelerated [ 80 ]. Song et al reported that fine and uniform grains with a size of 30–50 μm of as-cast TiAl alloys could be obtained from the original coarse lamellar grains of about 1000 μm by EPT.…”

Effect of Crystallization Temperature on the Microstructures and Mechanical Properties of Enamel Substrate RT330

“…As we known, the strengthening mechanism of materials mainly contains solid solution strengthening and alloying, transformation hardening, grain boundary strengthening, and precipitation strengthening . In the crystallization treatment, there was no change in the chemical composition of RT330 enamel substrate.…”

Effect of High-Frequency Induction Carburization on Ti6Al4V Alloy Tissue and Wear Performance

“…Li X [9] found that the titanium alloy surface columnar dendrites is breaked and drive equiaxed crystal migration under the combined action of the skin effect and Lorentz force. Ye X [10] have studied the effect of pulse current on the microstructure, mechanical properties and corrosion properties of Ti6Al4V alloy in recent years. Relevant literature shows [11][12] that the external magnetic field has an impact on the microstructure and properties of titanium alloy during the heat treatment.…”