摘要
采用金相显微镜、电子探针、扫描电镜和透射电子显微镜等手段,研究添加微量Sc对2055铝锂合金微观组织与性能的影响。研究结果表明:0.1%Sc的添加可在一定程度上减少2055铝锂合金凝固过程中成分偏析的现象,并可消除合金枝晶,具有明显细化晶粒的作用;但0.1%Sc添加的2055铝锂合金硬度及强度显著低于2055铝锂合金,断裂模式由韧性断裂为主的模式改变为韧性+脆性断裂为主的模式,这主要是Sc添加后合金中形成了粗大第二相W相,消耗了合金中溶质原子Cu,减小了T1相析出体积分数,使合金强度下降。
The effect of Sc on the microstructure and mechanical properties of 2055 Al-Li alloy was studied by means of metallographic optic microscope(OM),electron probe micro-analyzer(EPMA),scanning electron microscope(SEM)and transmission electron microscopy(TEM).The re-sults show that the addition of 0.1%Sc can reduce the composition segregation and eliminate the dendrite in the solidification process of 2055 Al-Li al-loy.However,the hardness and strength of 2055 Al-Li alloy added 0.1%Sc were significantly lower than that of 2055 Al-Li alloy,and the fracture mode changed from ductile fracture mode to ductile+brittle fracture mode,the main reason is that the coarse second phase W is formed in the alloy after Sc addition,which consumes the solute atom Cu in the alloy,reduces the precipitation volume fraction of T1 phase and reduces the strength of the alloy.
作者
张淑英
傅溶
Zhang Shuying;Fu Rong(College of Materials and Advanced Manufacturing,Hu'nan University of Technology,Hu'nan,412000)
出处
《当代化工研究》
CAS
2023年第18期24-27,共4页
Modern Chemical Research
