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Growth kinetics of antiphase domain in Ti_3Al intermetallic compound

机译：Ti_3Al金属间化合物中反相畴的生长动力学

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摘要

Growth kinetics of antiphase domain (APD) which increases the yield strength of Ti_3Al by a factor of five, was investigated in Ti_3Al compounds with compositions of 22.6, 24.6 and 34.7 at.%Al by quenching from disordered state and subsequent isothermal annealing at 973-1173 K. The variation in APD size exhibited positive deviation from the conventional 'parabolic-growth-law' in the early stage in all the compounds, while negative deviations were observed in the late stage in all the compounds except the stoichiometric one (Ti-25 at.%Al). The variation in the APD size in the stoichiometric compound was numerically calculated by considering the variation in the long range order in the matrix (S) and that in the mobility of the APDBs which was enhanced by non-equilibrium excess vacancies which were introduced by the quenching. The calculated variations in APD size could be successfully fitted to the experimental results in the early stage, and therefore, the positive deviation was attributed to the enhancement of the mobility of APDBs by the excess vacancies. In the late stage, the segregation of excess atoms (i.e. Ti atoms in Ti-rich composition and Al atoms in Al-rich composition) was detected in the compounds of off-stoichiometric composition by energy-dispersive X-ray spectroscopy, while any heterogeneity of composition was not observed in the stoichiometric compound. Faceted APDBs were observed in this stage. The mechanism of the negative deviation was attributed to the segregation and the facet which decrease the mobility and/or the driving force of the APDB migration.
机译：通过从无序态淬灭并随后在973- 1173K。在所有化合物中，APD尺寸的变化在早期均表现出与常规“抛物线增长定律”的正偏差，而在后期，除化学计量比（Ti- 25 at。％Al）。化学计量化合物中APD尺寸的变化是通过考虑基质（S）中的长程顺序变化和APDBs迁移率的变化而计算得出的，该变化是由非平衡过量空位所增加的，该空位是由S引入的。淬火。计算得出的APD大小变化可以在早期阶段成功地拟合到实验结果，因此，正偏差归因于过量空位增加了APDB的迁移率。在后期，通过能量色散X射线光谱法检测到化学计量成分以外的化合物中多余的原子（即富钛成分中的钛原子和富铝成分中的铝原子）的偏析。在化学计量化合物中未观察到组成的变化。在此阶段观察到多面APDB。负偏差的机制归因于偏析和刻面，它们降低了APDB迁移的迁移率和/或驱动力。

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