摘要
通过对均匀化退火后的AZ91镁合金热挤压以及随后的时效处理,分析了形变及时效过程对材料组织与性能的影响.结果表明:AZ91镁合金在320和380℃挤压时发生了动态再结晶,组织比铸态细化,力学性能大幅度提高;随后的时效处理进一步提高了挤压镁合金的力学性能.经380℃挤压及200℃,10 h的时效处理后,其抗拉强度σ_b可达357 MPa,延伸率δ达到8%.
Microstructures and mechanical properties of AZ91 magnesium alloy after homogenization, hot extrusion and succedent aging are investigated. The results show that dynamic recrystallization occurred during extrusion at elevated temperatures of 320 and 380 ℃. Compared to the as-cast alloy, the microstructures of the extruded AZ91 alloy are refined, and the mechanical properties are enhanced remarkably. Succedent aging further improved the mechanical properties of the extruded AZ91 alloy. The ultimate tensile strength of AZ91 alloy extruded at 380 ℃ and aged at 200 ℃ for 10 h is about 357 MPa, and the elongation about 8%.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期920-924,共5页
Acta Metallurgica Sinica
基金
重庆市科技攻关重点资助项目CSTC.2004AA4003
关键词
镁合金
热挤压
时效
组织
力学性能
magnesium alloy, hot extrusion, aging, microstructure, mechanical property
