Microstructure and refinement mechanism of TiB2/TiAl3 in remelted Al-5Ti-1B system
Microstructure and refinement mechanism of TiB2/TiAl3 in remelted Al-5Ti-1B system
复制标题
重熔Al-5Ti-1B系TiB2/TiAl3的显微组织及细化机制
DOI：
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发表时间：
2019
影响因子：
1.8
通讯作者：
L. Wang
中科院分区：
文献类型：
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作者：
Pingping Qian;Zhenghua Tang;M. Yuan;Yanling Xiang;L. Wang
在这项工作中，我们提出了一种新的方法（通过重熔Al-5Ti-1B）来研究晶粒细化机制。发现TiAl3相的形态和尺寸对纯Al晶粒细化的影响不大。因此，进一步的实验研究是为了了解TiB2颗粒的效力。高分辨率透射电镜（HRTEM）观察证实（0001）TiB2表面存在原子层，可能是二维（2D） （1-12） TiAl3。晶体学研究表明，它是α-Al较适合的成核点。带有tial32d的TiB2粒子是α-Al最有效的成核位点。
In this work, we propose a new method (by remelting Al-5Ti-1B) to investigate the grain refinement mechansim. It is found that the morphology and size of TiAl3 phase had little effect on the grain refinement of pure Al. Therefore, further experimental studies were carried out to understand the potency of TiB2 particles. The high-resolution transmission electron microscopy (HRTEM) observation has confirmed the existence of an atomic layer on the surface of (0001) TiB2, which is possibly a two-dimensional (2D) (1-12) TiAl3. Crystallographic study indicates that it is a more suitable nucleation sites for α-Al than other particles. The TiB2 particle with TiAl3 2D acts as the best effective nucleation sites for α-Al.