| Title | Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy |
| Authors | Zhang, Yun Li, Ruiqing Li, Xiaoqian Yang, Yilong Chen, Pinghu Dong, Fang Jiang, Ripeng |
| Affiliation | Cent S Univ, Light Alloy Res Inst, Changsha 410012, Hunan, Peoples R China. Cent S Univ, Natl Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China. Peking Univ, Sch Adv Mat, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China. Cent S Univ, Light Alloy Res Inst, Changsha 410012, Hunan, Peoples R China. Li, RQ (reprint author), Cent S Univ, Natl Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China. |
| Keywords | ultrasonic cavitation inclusion fragmentation heterogeneous nucleation IN-SITU OBSERVATION GRAIN-REFINEMENT MOLTEN ALUMINUM EROSION POWER MELT |
| Issue Date | 2018 |
| Publisher | METALS |
| Citation | METALS. 2018, 8(10). |
| Abstract | Oxide films or inclusions can reduce the continuity and integrity of materials and they always lead to a significant reduction in the mechanical properties of an aluminum alloy. They can greatly reduce the plastic flow behavior of materials, thus affecting the subsequent processing performance. Therefore, an effective ultrasonic assisted preparation technology has been applied to industrial manufacturing of large-scale aluminum alloy ingots (with diameter: Phi = 1250 mm and height: h = 3750 mm). However, the mechanisms of ultrasonic purification on the large-scale ingots are not clear. Therefore, a number of aluminum alloy casting experiments were carried out to produce a conventional hot top semi-continuous ingot (CHTI) and an ultrasonic hot top semi-continuous ingot (UHTI) in this work. The microstructures of CHTI and UHTI were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM). The results indicated that there were some oxide film defects in the CHTI but some finely dispersed inclusion particles were discovered in the UHTI. The X-ray diffraction (XRD) data showed that the component of inclusion was Al2O3. According to the different cavitation effects of the different areas of the molten aluminum, the process of ultrasonic purification was divided into three periods and the mechanisms in each period were separately studied. |
| URI | http://hdl.handle.net/20.500.11897/568338 |
| ISSN | 2075-4701 |
| DOI | 10.3390/met8100814 |
| Indexed | SCI(E) |
| Appears in Collections: | 新材料学院 |
