The effect of Ti addition on microstructure evolution of AZ61 Mg alloy during mechanical milling
The effect of Ti addition on microstructure evolution of AZ61 Mg alloy during mechanical milling
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添加Ti对AZ61镁合金机械铣削过程中显微组织演变的影响
DOI：
10.1016/j.jallcom.2017.02.029
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发表时间：
2017-05
影响因子：
6.2
通讯作者：
Zhou Haiping
中科院分区：
文献类型：
--
作者：
Yu Huan;Sun Yu;Hu Lianxi;Wan Zhipeng;Zhou Haiping
AZ61 镁和 AZ61 镁，10 at。添加 %Ti（AZ61-10 at.%Ti）进行机械铣削，并对微观结构演变进行比较研究。在机械铣削过程中，由于机械铣削，两种材料都观察到镁晶粒细化/纳米晶化和 Mg17Al12 沉淀物溶解，并形成 Al 过饱和镁固溶体。从密度位错分析，Ti弥散阻碍了位错和晶界的运动，加速了位错的堆积。因此，Ti的添加加速了Mg晶粒细化，同时，根据X射线衍射和透射电子显微镜结果，具有Ti分散体的最终Mg晶粒（43.47 nm）小于没有Ti分散体的最终Mg晶粒（69.19 nm）。扫描电镜和X射线衍射表明，Ti分散体加速了Mg17Al12沉淀的溶解，并且高角度环形暗场证实了Al在Ti相中的溶解。此外，在机械铣削过程中，Ti颗粒通过焊接和开裂作用逐渐进入Mg颗粒中。经过机械球磨后，分散在镁基体中的Ti相被粉碎至约274.0 nm，合成了Ti过饱和镁固溶体，固溶度为1.07 at。 %。
AZ61 Mg and AZ61 Mg with 10 at. %Ti addition (AZ61-10 at. %Ti) were mechanically milled and a comparative study on microstructure evolution was performed. During mechanical milling, Mg grain refining/nanocrystallization and the dissolving of Mg17Al12precipitates, with the formation of Al supersaturated Mg solid solution, were observed for both materials due to mechanical milling. As analyzed by density dislocation, Ti dispersions hinder the movement of dislocations and grain boundaries and accelerate the dislocation pile-up. Therefore, Ti addition accelerated Mg grain refining, meanwhile, the ultimate Mg grain (43.47 nm) with Ti dispersions was smaller than that (69.19 nm) without Ti dispersions based on X-ray diffraction and transmission electron microscopy results. As the scanning electron microscope and X-ray diffraction exhibiting, the dissolving of Mg17Al12precipitates was expedited by Ti dispersions and the dissolving of Al in Ti phase was verified by high angle annular dark field. Moreover, during mechanical milling, Ti particulates entranced Mg particles gradually by the welding and cracking effect. After mechanical milling, Ti phase, dispersed in Mg matrix, were smashed to approximately 274.0 nm and Ti supersaturated Mg solid solution was synthesized with the solid solubility being 1.07 at. %.
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