中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 2 February 2025 |
（1. School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710100, China;
2. Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:Low-intensity ultrasound was applied to the pressureless consolidation of AlSi10Mg powders in a broad temperature range from 600 to 860 °C. Under static conditions, the consolidation of AlSi10Mg powders can only be achieved at 860 °C, but still with the presence of some residual unconsolidated regions. The introduction of low-intensity ultrasound at this temperature eliminates the unconsolidated regions and transforms the columnar grains observed in original directional solidification into equiaxed or globular grains. Remarkably, the application of low-intensity ultrasound significantly reduces the consolidation temperature to 620 °C, without compromising the microhardness of the resulting samples when compared to static conditions. Furthermore, by lowering the temperature to 600 °C, a well-sintered porous material is obtained through the assistance of the low-intensity ultrasound.
Key words: low-intensity ultrasound; pressureless consolidation; aluminum powders; columnar-to-equiaxed transition; microhardness
