摘要
采用拉伸性能测试、光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)及能谱分析(EDS)研究了均匀化对低频电磁铸造Al-4.75Mg-0.7Mn-0.1Zr-0.1Ti-0.3Er合金的显微组织和力学性能的影响。在510℃/16h均匀化时,晶界残留相FeMnAl6/MnAl6的数量最少、而晶内弥散相的数量最多,且随后经热轧、冷轧和稳定化退火试样的强度最高;且在冷轧板拉伸变形组织中观察到了大量细小的胞状亚结构、100~500μm的FeMnAl6/MnAl6板条和10~30nm的ErAl3相;FeMnAl6/MnAl6相周围塞积了高密度的位错,ErAl3相易于在位错处析出并可有效地钉扎位错使变形更均匀。
The microstructures and mechanical properties of low-frequency-electromagnetic-cast Al-4.75Mg-0.7Mn-0.1Zr-0.1Ti-0.3Er alloy were investigated by tensile test, OM, SEM, TEM and EDS. When homogenized at 510℃ for 16 h, the amount of residual grain boundary phase FeMnA16/MnA16 is minimum, while the amount of dispersoids in the matrix is maximum, and the sample with the subsequent cold rolling, hot rolling and stabilized annealing has the highest strength. A large amount of dislocation cells, FeMnAl6/MnAl6 rods with size of 100-500 μm and ERA13 particles with size of 10-30 nm precipitates were observed in cold rolled sample homogenized at 510 ℃/16 h after tensile test. ERA13 is easy to precipitate along dislocations. During deformation, high density dislocations are accumulated near FeMnAl6/MnAl6 and fine ERAl3 can effectively pin dislocations, which makes deformation homogeneous.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第A01期107-112,共6页
Rare Metal Materials and Engineering
基金
"十一五"国家科技支撑计划项目(2007BAE38B01)