Low-temperature pressureless consolidation of AlSi10Mg powders by low-intensity ultrasound  

低强度超声辅助实现AlSi10Mg粉末的低温无压固结

作　　者：Yu-ze LI Long-fei ZHU Xin WANG Song TANG Ting LUO Jian-yuan WANG 李玉泽;朱龙飞;王昕;唐颂;罗婷;王建元(西北工业大学物理科学与技术学院,西安710100;南京理工大学材料科学与工程学院格莱特研究院,南京210094;西北工业大学凝固技术国家重点实验室,西安710072)

机构地区：[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

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期349-361,共13页中国有色金属学报(英文版)

基　　金：National Natural Science Foundation of China(Nos.52101051,52130405,51872241,52101142);Key Research Plan of Shaanxi Province,China(No.2020ZDLGY13-03);Key Research and Development Program of Shaanxi Province,China(No.2023-YBGY-439);Fundamental Research Funds for the Central Universities,China(No.5000210653)。

摘　　要：Low-intensity ultrasound was applied to the pressureless consolidation of AlSi10Mg powders in a broad temperature range from 600 to 860℃.Under static conditions,the consolidation of AlSi10Mg powders can only be achieved at 860℃,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℃,without compromising the microhardness of the resulting samples when compared to static conditions.Furthermore,by lowering the temperature to 600℃,a well-sintered porous material is obtained through the assistance of the low-intensity ultrasound.将低强度超声应用于AlSi10Mg粉末在600~860℃宽温度范围的无压固结过程。在静态条件下,AlSi10Mg粉末只能在高温860℃时实现固结,但仍存在未固结区域。在此温度下施加低强度超声波消除了未固结区域,并将原始定向凝固条件下的柱状晶粒优转为等轴或球状晶粒。施加低强度超声将AlSi10Mg粉末的固结温度降低至620℃,且获得了静态条件下高温固结样品同等级别的硬度。另外,施加低强度超声实现了AlSi10Mg粉末在600℃下的烧结,获得了固结良好的多孔结构。

关 键 词：low-intensity ultrasound pressureless consolidation aluminum powders columnar-to-equiaxed transition MICROHARDNESS 

分 类 号：TB3[一般工业技术—材料科学与工程]