喷射沉积超高强铝基复合材料的组织及性能研究

Study on Microstructure and Properties of Ultra-high Strong Aluminum-based Composites by Spray Forming

采用喷射沉积技术研制铝基SiC复合材料,通过调整喷射沉积参数(雾化压力、扫描频率)和同轴送粉设备参数,研制出SiC均匀分布的直径为φ255 mm、高度为500 mm的喷射沉积铝基复合材料坯锭。微观组织结果表明,沉积坯锭晶粒均匀细小,无宏观偏析现象,晶粒平均尺寸为(17.3±4.7)μm,但部分晶粒之间存在微孔缺陷。SiC颗粒在基体中没有明显的富集,呈弥散分布,尺寸约5~20μm,且在SiC颗粒附近有微孔缺陷。经挤压处理、双极固溶处理、峰时效处理后,合金的抗拉强度、屈服强度、断后伸长率、弹性模量分别为650 MPa、600 MPa、6%、85 GPa,并且组织致密无微孔。

The aluminium base SiC composite was researched by spray forming,and the aluminum-based composite ingot with a uniform diameter ofφ255 mm and a height of 500 mm was developed by adjusting the injection deposition parameters(atomization pressure,scanning frequency)and coaxial powder delivery equipment parameters.The microscopic microstructure results show that the grains of the deposited ingots are uniform and fine,and there is no macrosegregation phenomenon.The average grain size is(17.3±4.7)μm,but there are microporous defects between some grains.There is no obvious enrichment of SiC particles in the matrix,and they are distributed in a dispersed distribution with a size of about 5-20μm,and there are microporous defects near the SiC particles.After extrusion treatment,bipolar solution treatment,and peak aging treatment.The tensile strength,yield strength,elongation after fracture and elastic modulus of the alloy are 650 MPa,600 MPa,6%and 85GPa,respectively,and the structure is dense without micropores.