摘要
通过搅拌铸造工艺制备体积分数为10%的SiC颗粒增强AZ91镁基复合材料。对复合材料依次进行了固溶、热变形和时效处理,研究了热处理对镁基复合材料组织和性能的影响。结果表明,铸态复合材料经固溶处理后,晶界处分布的大块Mg17Al12相消失,复合材料的强度和伸长率得到显著提高。热变形后,复合材料的晶粒细化,颗粒分布更加均匀,提高了复合材料的力学性能。经时效处理后,复合材料中析出弥散细小的Mg17Al12相,使热变形后复合材料的力学性能得到进一步提高。
10 vol % SiCp reinforced magnesium matrix composite was fabricated by stir casting.The composite was treated by solution,hot deformation and aging,respectively.Effect of heat treatment on microstructure and mechanical properties of the magnesium matrix composite was researched.The results show that the massive Mg17Al12 phase at grain boundaries disappears,and strength and elongation of the as-cast composite increase obviously after solution treatment.After hot deformation,the grains are refined and the particles distribute much more uniformly,thus the mechanical properties of the composite are improved.By the subsequent aging treatment,the precipitated fine Mg17Al12 phase in the magnesium matrix composite is propitious to the enhancement of mechanical properties.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2012年第9期29-32,共4页
Transactions of Materials and Heat Treatment
关键词
镁基复合材料
固溶处理
热变形
时效
magnesium matrix composite
solution treatment
hot deformation
aging
