摘要
以粉末冶金法制备了具有屏蔽效能的铝基复合材料,分别以10∶1、15∶1和25∶1挤压比热挤压,并将挤压后的材料进行固溶强化和时效处理。通过对挤压态和T4态(WC+B4C)P/6063Al复合材料拉伸性能的比较以及SEM、TEM分析,研究了该复合材料的力学性能。结果表明:以15∶1挤压比进行热挤压,在520～530℃下固溶强化和时效处理时,该复合材料的力学性能最佳,抗拉强度大于300MPa且伸长率达10%以上;热处理后基体中Mg2Si析出相尺寸和形貌上的变化以及增强颗粒的弥散强化是该复合材料力学性能提升的原因。
Al matrix composite with shield materials against ray radiation was fabricated by powder metallurgy processing.The composite was extruded under following 10 ∶ 1,15 ∶ 1,25 ∶ 1,then solution treatment and natural aging were carried out.The mechanical properties of the composite 6063 Al alloy reinforced with particulate WC and B4C were investigagted by tensile test and microstructure of extruded and T4 materials,SEM,and transmission electron microscope（TEM）.The results show that the composite extrudes under 15 ∶ 1 ratio and solution treatment at 520 ℃～530 ℃ present best mechanical properties.The tensile strength is greater than 300 MPa and elongation is above 10%.The reasons for the elevation of mechanical properties of the composite are the variation of Mg2Si precipitation size,morphology and particle dispersion strengthening.
出处
《热加工工艺》
CSCD
北大核心
2011年第20期103-106,共4页
Hot Working Technology
关键词
铝基复合材料
热挤压
热处理
力学性能
aluminum matrix composite
hot extrusion
heat treatment
mechanical properties
