摘要
利用喷射成形工艺制备了Al9Zn2·9Mg3·0Mn1·7Cu超高强铝合金材料,用金相、XRD、SEM、TEM等测试方法对其显微组织进行了分析。研究结果显示,基体组织由细小的等轴晶粒构成,晶粒平均尺寸约为12μm。沉积坯主要由α-Al、Al6Mn、MgZn2相组成,晶界处尚有少量Al2Cu相和鱼骨状四元共晶TAlZnMgCu相。Al6Mn相一般呈短棒状或盘状,大部分含锰颗粒的尺寸<5μm,Al6Mn相主要沿晶界析出,少量在晶内析出;细小的MgZn2相则弥散分布于铝合金基体内,其尺寸一般为数十个纳米。
Ultrahigh strength Al9Zn2.9Mg3.0Mnl. 7Cu alloy billet was fabricated by spray forming method. The microstructures of the alloy as-deposited were studied by OM, XRD, SEM,EDS and TEM. The results show that the microstructure of the as-deposited alloys comprises the fine, homogeneous and equaxial grains with the diameter of 12 μm. The as-deposited alloy is composed of α-Al, Al6Mn and MgZn2 phases. There are little Al2Cu and the eutectic phase TAZnMgCu along the grain boundary. The A16Mn particles can be observed with different appearances such as cosh or plate and the size of them are mostly not more than 5 μm. Most of A16Mn particles are precipitated along the grain boundary and a few of them are inner grains. The MgZn2 particles with size in nano-scale distributes exist in the alloy matrix evenly.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第8期24-27,共4页
Heat Treatment of Metals
关键词
喷射成形
超高强铝合金
沉积态
显微组织
等轴晶
spray forming
ultrahigh strength aluminum alloys
as-deposited
microstructure
equiaxed grain
