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Deformation Mechanism of Solidified Ti<sub>3</sub>Al Alloys with Penta Twins under Shear Loading
oleh: Xiaotian Guo, Han Xie, Zihao Meng, Tinghong Gao
Format: | Article |
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Diterbitkan: | MDPI AG 2022-08-01 |
Deskripsi
Owing to the excellent mechanical properties of the Ti<sub>3</sub>Al alloy, the study of its microstructure has attracted the extensive attention of researchers. In this study, a Ti<sub>3</sub>Al alloy was grown based on molecular dynamics using a decahedral precursor. Face centered cubic nanocrystals with tetrahedral shapes were formed and connected by twin boundaries (TBs) to form penta twins. To understand the shear response of the Ti<sub>3</sub>Al alloy with multiple and penta twins, a shear load perpendicular to the Z-axis was applied to the quenched sample. The TBs slipped as Shockley dislocations commenced and propagated under shear loading, causing the detwinning of the penta twins and the failure of the system, indicating that the plastic deformation had been due to Shockley dislocations. The slip mechanism of multi-twinned structures in the Ti<sub>3</sub>Al alloy is discussed in detail. This study would serve as a useful guide for the design and development of advanced alloy materials.