摘要
Ce对Fe-Ni膨胀合金凝固组织的影响研究结果表明:经Ce处理后,Fe-Ni膨胀合金中形成了大量的高熔点Ce2O3包芯Al2O3复合物,尺寸约为2μm.错配度理论计算表明,Ce2O3的某些低指数面与Fe-Ni膨胀合金的低指数面具有7·1%的较低错配度,因此Ce2O3作为非均匀形核核心使膨胀合金凝固组织由完全的柱状晶变为完全的等轴晶组织.Ce在凝固组织的等轴晶晶界上以Ce2O3、Ce2O2S和CeS形式存在,具有阻止晶粒长大的作用.
An investigation on the effect of Ce on the solidification structure of an Fe-Ni base Invar expansion alloy shows that great amount of high-melting compounds （Ce2O3） with a size of 2.0 μm form in the alloy after Ce addition. Based on the theory of lattice misfit, the lattice misfit of low-index surfaces between Ce2O3 and the alloy is 7.1%, which is relatively low; with Ce2O3 as heterogeneous nucleation, therefore, the solidification structure of the alloy changes from complete dendrite grains to complete equiaxed grains. There are Ce2O3, Ce2O2S and CeS in the interface of equiaxed grains, which prevent from the growth of crystal grains.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2009年第7期867-870,共4页
Journal of University of Science and Technology Beijing
关键词
膨胀合金
铈
凝固组织
错配度
Invar alloy
cerium
solidification structure
lattice misfit
