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Mechanical properties of U-0.95 mass fraction of Ti alloy quenching and aging treatment: a first principles study

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Abstract

First principles plane wave pseudopotential method was executed to calculate the mechanical properties with respect to the uranium-0.95 mass fraction of titanium (U-0.95 mass fraction of Ti) alloy for quenching and aging, including the elastic modulus, the value of shear modulus to bulk modulus (G/B) and the ideal tensile strength. The further research has also been done about the crack mechanism through Griffith rupture energy. These results show that the elastic moduli are 195.1 GPa for quenching orthorhombic α´ phase and 201.8 GPa for aging formed Guinier-Preston (G.P) zones, while G/B values are 0.67 and 0.56, respectively. With the phase change of uranium-titanium (U-Ti) alloy via the quenching treatment, the ideal tensile strength is diverse and distinct with different crystal orientations of the anisotropic α´ phase. Comparison of quenching and short time aging treatment, both of the strength and toughness trend to improve slightly. Further analysis about electronic density of states (DOS) in the electronic scale indicates that the strength increases continuously while toughness decreases with the aging proceeding. The equilibrium structure appears in overaging process, as a result of decomposition of metastable quenching α´ phase. Thereby the strength and toughness trend to decrease slightly. Finally, the ideal fracture energies of G.P zones and overaging structure are obtained within the framework of Griffith fracture theory, which are 4.67 J/m2 and 3.83 J/m2, respectively. These results theoretically demonstrate strengthening effect of quenching and aging heat treatment on U-Ti alloy.

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Acknowledgments

Computational resources were supported by Shanghai Supercomputer Center and High Performance Computing Center, Shanghai University. The work described in this paper was supported by the National Natural Science Foundation of China (Grant Nos. 51074103 and 51104098) and Shanghai Scientific Selection and Cultivation for outstanding young teachers in special fund and Innovation Program of Shanghai University (Grant No. SDCX2012011).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, People’s Republic of China

    Jian-Bo Qi, Guang-Xin Wu & Jie-Yu Zhang

  2. China North Nuclear Fuel Co. Ltd., Baotou, 014035, People’s Republic of China

    Jian-Bo Qi

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  1. Jian-Bo Qi
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  2. Guang-Xin Wu
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Correspondence to Guang-Xin Wu.

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Qi, JB., Wu, GX. & Zhang, JY. Mechanical properties of U-0.95 mass fraction of Ti alloy quenching and aging treatment: a first principles study. Adv. Manuf. 3, 244–251 (2015). https://doi.org/10.1007/s40436-014-0090-1

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  • DOI: https://doi.org/10.1007/s40436-014-0090-1

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