Investigation of precipitation and tensile properties of 7B04 under direct current and aging

Precipitation Behavior of Aluminum–Manganese Alloy under Different Heating Methods

“…It has been documented that the influence of current on precipitation nucleation and precipitate growth varies with heat treatment temperature. 13) That's to say, the effect of electric current on precipitation behavior, i.e. nucleation, coarsening and dissolution, depends on the phase transformation temperature of the precipitates, which is mainly determined by the chemical composition of the material.…”

“…23,24) On the other hand, the diffusion of alloying elements is accelerated by the current, which promotes the nucleation of precipitates, increases the number of second-phase precipitates, and also promotes the growth of precipitates. 13,25,26) Current can both increase the precipitation rate and delay the precipitation rate, depending on the alloy, current density and frequency. 25) The influence mechanism of electromigration induced by current in the precipitation process is still unclear.…”

Achieving Excellent Properties of Cu-Ni-Si Copper Alloy by Cold Rolling and Electropulsing Aging

“…18,19 He found that 7B04 aluminum alloys aged with the help of direct current reached higher tensile strength and elongation than those aged only with the furnace. 20 At present, many works focus on the assistance effect of electropulsing in furnace treatment. Although Zhu has reported that Cu-Ni-Si alloys were treated by electropulsing directly to improve the properties, the tensile strength and electrical conductivity are < 610 MPa and 33.5% IACS, respectively, 21 having a gap compared with the properties of commercial C7025.…”

Microstructure and mechanical properties of Co-28Cr-6Mo-0.22C investment castings by current solution treatment

“…The current, by reducing the diffusion activation energy of elements and augmenting diffusion rates, enhances heat treatment efficiency [23][24][25] . For instance, Wang et al [26] demonstrated the current aging at 450 °C for 0.5 min achieved higher strength and plasticity in Fe-Mn-Al-C steel compared to traditional aging treatment at the same temperature for 3.0 h. The additional free energy introduced by current can lower the thermodynamic barrier, making it easier for precipitated phases to dissolve during solution treatment [27][28][29][30] . For instance, there was a significant decrease in the number of nano-precipitates in SA508-III steel after the current heat treatment at 430 °C for 3.0 min, a phenomenon that did not occur in traditional heat treatment at the same temperature and duration [31] .…”