alpha ->beta Transformation characteristics revealed by pulsed laser-induced non-equilibrium microstructures in duplex-phase Zr alloy
alpha ->beta Transformation characteristics revealed by pulsed laser-induced non-equilibrium microstructures in duplex-phase Zr alloy
复制标题
脉冲激光诱导双相Zr合金非平衡显微组织揭示α->β相变特征
DOI：
10.1007/s11431-016-9038-y
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发表时间：
2017
影响因子：
4.6
通讯作者：
Song Bo
中科院分区：
文献类型：
--
作者：
Chai LinJiang;Wang ShuYan;Wu Hao;Guo Ning;Pan HuCheng;Chen LiangYu;Murty K. L.;Song Bo
用电子背散射衍射(EBSD)和电子沟道衬度成像(ECC)技术研究了脉冲激光处理的双相合金的显微组织。重点研究了由原有的α相和β相组成的非平衡混合组织，以及由新的α相转变而成的β片状组织，以探索该合金中的α→β相变特征。产生混杂组织的原因是由于脉冲激光处理所产生的特定热力学条件。电化学观察表明，在激光加热过程中，新形成的β相倾向于形核和长大，而不是以牺牲原有α颗粒的边缘为代价。EBSD分析进一步表明，根据Burgers关系，新β相的取向不是由先前的α颗粒决定的，而是以外延生长的方式保持了先前β相的取向。
Microstructures of a duplex-phase Zr-2.5Nb alloy treated by pulsed laser were characterized by electron backscatter diffraction (EBSD) and electron channeling contrast (ECC) imaging techniques. Major attention has been paid to non-equilibrium hybrid microstructure consisting of both prior α and β phases, and α plates transformed from new β phases to probe α→β transformation characteristics in the alloy. The origin of the hybrid microstructure is attributed to the specific thermodynamic conditions induced by the pulsed laser treatment. ECC observation shows that newly formed β phases during laser heating prefer to nucleate and grow at the expense of edges of prior α grains rather than their interiors. EBSD analyses further reveal that orientations of the new β phases are not determined by the prior α grains according to the Burgers relationship but maintain those of the prior β phases in an epitaxial growth way.