Microstructural characterization of an alpha plus beta type Ti-5.5Mo-7.2Al-4.5Zr2.6Sn-2.1Cr alloy during recrystallization annealing
Microstructural characterization of an alpha plus beta type Ti-5.5Mo-7.2Al-4.5Zr2.6Sn-2.1Cr alloy during recrystallization annealing
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α+β型Ti-5.5Mo-7.2Al-4.5Zr2.6Sn-2.1Cr合金再结晶退火过程的显微组织表征
DOI：
10.1016/j.jallcom.2017.02.132
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发表时间：
2017
影响因子：
6.2
通讯作者：
Cheng X
中科院分区：
文献类型：
--
作者：
Shi R;Li G;Xia Y;Fan Q;Wang F;Zhang H;Cheng X
对一种α+β型钛合金进行了不同时间的再结晶退火，并对退火后的组织演变进行了表征。结果表明，在大变形量锻造过程中，β相的再结晶速率高于α相，这是由于该相具有较高的应变储能。在740 °C下，随着保温时间的延长，α相和β相的再结晶分数均增加。退火5h后，β相的再结晶率为70.13%。然而，当再结晶分数达到约54%时，平均晶粒尺寸保持恒定，这表明由于高的再结晶程度，阻止了进一步的晶粒细化。采用三维电子背散射衍射技术对该合金的空间组织进行了表征，其微观结构为球状、均匀、等轴的α相弥散分布在亚结构的β基体晶粒中。计算并讨论了晶粒取向和形貌参数，包括等效球直径和相邻晶粒数。
Anα+βtype titanium alloy was subjected to various periods of recrystallization annealing and the resulting microstructural evolution was characterized. The results revealed that the recrystallization rate of theβphase was higher than that of theαphase, owing to the high strain energy storage of this phase during large deformation forging. Moreover, the recrystallized fraction of both theαandβphases increased with increasing holding time at 740 °C. The recrystallization fraction of theβphase accounted for 70.13% after annealing for 5 h. However, the average grain size remained constant when the recrystallization fraction reached approximately 54%, indicating that further grain refinement was prevented, owing to the high degree of recrystallization. The spatial microstructure which consisted of a globular, homogeneous, and equiaxedαphase dispersed in sub-structuredβmatrix grains, was characterized via a novel three-dimensional electron backscatter diffraction technique. The grain orientation and morphological parameters, including the equivalent-sphere diameter and number of neighboring grains, were calculated and discussed.