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Effect of Si and Holding Time on Ti<sub>2</sub>Al<sub>20</sub>La Phase in Al-Ti-La Intermediate Alloy
oleh: Hu Da, Xudong Tian, Jiazhi An, Wanwu Ding, Jianchao Chen, Haicun Yu, Haixia Zhang
Format: | Article |
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Diterbitkan: | MDPI AG 2024-06-01 |
Deskripsi
The effects of holding time and Si on the content, shape size and structure of Ti<sub>2</sub>Al<sub>20</sub>La phase in Al-Ti-La intermediate alloy were investigated by an X-ray diffractometer, scanning electron microscope and transmission electron microscope. The results show that the volume fraction and aspect ratio of Ti<sub>2</sub>Al<sub>20</sub>La phase in Al-Ti-La intermediate alloy decrease significantly, from 21% and 2.3 without Si addition to 4% and 2.0 with the addition of 2.3 wt.% Si at a holding time of 15 min at 750 °C, respectively. The Si element will attach to the Ti<sub>2</sub>Al<sub>20</sub>La phase and form La-Si binary phase at the grain boundary of α-Al. With the increase of holding time from 15 min to 60 min, the content of Ti<sub>2</sub>Al<sub>20</sub>La phase in the alloy gradually decreases and the size decreases significantly. Meanwhile, Al<sub>11</sub>La<sub>3</sub> will dissolve and disappear, while the content of La-Si binary phase increases, and part of Ti<sub>2</sub>Al<sub>20</sub>La phase transforms into Ti<sub>2</sub>(Al<sub>20−<i>x</i></sub>,Si<i><sub>x</sub></i>)La phase.