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Jian Wang,Jingpei Xie,Zhiyi Liu,Aiqin Wang,Wenyan Wang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
In this work, effects of artificial aging temperature on the mechanical properties and precipitation behavior of a pre-strainedAl–Cu–Mg–Ag alloy were investigated by hardness and tensile tests, and quantitative transmission electron microscopeanalysis. Three aging conditions, a single aging at a high temperature (T8H), a single aging at a low temperature (T8L) andan interrupted aging at low temperature following under-aging at a higher temperature (T8I4), were compared. Based on thequantitative analysis of the strengthening phases, the evolution law of the average diameter, thickness and volume fractionof Ω plates with the aging time for a pre-stretched Al–Cu–Mg–Ag alloy aged at 190 °C/160 °C may be predicted by themodified equations. The precipitation behavior of Ω precipitates was confirmed by considering the coarsening kinetics ofthem. Results show that a higher aging temperature can increase the precipitation kinetics of Ω phase and inhibit the precipitationof θ′ phase. Thus, a new type of interrupted aging treatment, T8I4 (3.2% pre-stretch + 190 °C/1 h + 160 °C/10 h),was proposed to enhance the strength of the pre-stretched Al–Cu–Mg–Ag alloy.
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Hou Bo,Liu Pei,Wang Aiqin,Xie Jingpei 한국물리학회 2022 Current Applied Physics Vol.39 No.-
In the present work, the structural, electronic, elastic and mechanical properties of Ti2AlC and Ti2Al(C1-xOx) solid solutions were investigated using first-principles calculations for varied O content incorporation (x = 0, 0.125, 0.25, 0.375, 0.5). According to the calculation results, all Ti2Al(C1-xOx) solid solutions with various x values are stable, and the bonding strength of the Ti–Al bond increases with the doping of O element. In addition, the shear modulus G and C44 elastic constant of Ti2Al(C1-xOx) solid solutions are both lower than the bulk modulus B, indicating that the phase has good damage tolerance. Not only that, compared with Ti2AlC, the plasticity and toughness of Ti2Al(C1-xOx) solid solutions are improved with the increase of O atom doping and doping ratio. Simultaneously, the doping of O atom is also beneficial to reduce the generalized stacking fault energy of Ti2AlC, making the Ti2Al(C1-xOx) solid solutions more prone to shear deformation, thereby further enhancing plasticity.
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