摘要
采用箱式电阻炉进行时效处理,试样埋入石墨中防止氧化,利用OM、SEM和TEM等手段对含Ca高铝Mg-11Al-3Zn-2Ca挤压变形镁合金时效状态下的组织和力学性能进行了分析。结果表明,Mg-11Al-3Zn-2Ca挤压变形镁合金在9～25 h内时效,析出相为短棒状的β-Mg17Al12,析出过程遵循先晶界后晶内的规律;经过200℃时效后,抗拉强度有所提高,最大提高10 MPa;伸长率随时效时间延长呈下降趋势,15 h以内降低比较明显,超过15 h下降趋势变得较为缓慢。
Aging treatment using graphite protection in the box-type resistance furnace, the influences of extruded wrought and different aging treatment time on microstructure and mechanical properties of aged extruded wrought Mg-11Al-3Zn-2Ca alloy were investigated by using OM, SEM and XRD. The research results show that with the precipitation of bar-like β-Mg17-Al12 phase, the tensile strength of extruded wrought Mg-11Al-3Zn-2Ca magnesium alloy enhanced further after aging treatment at 200 ℃ within 9 -25 hours, at least 10 MPa increment of tensile strength and the elongation decreases with the increase of aging treatment time. Within the aging less than 15 hours, the reduction on elongation more obvious, while more than 15 hours the trend has become slow down.
出处
《铸造技术》
CAS
北大核心
2010年第4期478-481,共4页
Foundry Technology
