Characteristics of the Dynamic Recrystallization Behavior of Ti-45Al-8.5Nb-0.2W-0.2B-0.3Y Alloy during High Temperature Deformation
Characteristics of the Dynamic Recrystallization Behavior of Ti-45Al-8.5Nb-0.2W-0.2B-0.3Y Alloy during High Temperature Deformation
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DOI：
10.3390/met7070261
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
L. Xiang;B. Tang;X. Xue;H. Kou;Jinshan Li
中科院分区：
文献类型：
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作者：
L. Xiang;B. Tang;X. Xue;H. Kou;Jinshan Li
通过热压缩试验研究了Ti-45Al-8.5Nb-0.2W-0.2B-0.3Y（at%）合金的动态再结晶（DRX）行为。测试在 1000–1200 °C 的温度范围和 0.001–1 s−1 的应变速率范围（真应变为 0.9）下进行。研究发现，由于热机械耦合，热处理过程中产生的α2相在热压缩过程中减少。活化能为506.38 KJ/mol。随着变形温度的升高和应变速率的降低，DRX 更有可能发生，因为 DRX 过程有足够的时间和能量。此外，在1200℃温度和0.001s−1应变速率下，大角度晶界的体积分数增加到89.01%，意味着完全动态再结晶。此外，DRX与孪晶边界的形成有关。在完全动态再结晶的相同条件下，孪晶界的体积分数上升至16.93%。
The dynamic recrystallization (DRX) behavior of Ti-45Al-8.5Nb-0.2W-0.2B-0.3Y (at %) alloy has been investigated through hot compression tests. The tests were executed at a temperature range of 1000–1200 °C and a strain rate range of 0.001–1 s−1 under a true strain of 0.9. It was found that the α2 phase which is produced during heat treatment is reduced during hot compression due to thermo-mechanical coupling. The value of the activation energy is 506.38 KJ/mol. With the increase in deformation temperature and the decrease in strain rate, DRX is more likely to occur, as a result of sufficient time and energy for the DRX process. Furthermore, the volume fraction of high angle grain boundaries increases to 89.01% at a temperature of 1200 °C and the strain rate of 0.001 s−1, meaning completely dynamic recrystallization. In addition, DRX is related to the formation of twin boundaries. The volume fraction of twin boundaries rises to 16.93% at the same condition of completely dynamic recrystallization.