Ce对Fe-Ni膨胀合金凝固组织的影响

详细信息

Effect of Ce on the solidification structure of Fe-Ni base Invar expansion alloys

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Sub-institute of Metal Materials, Beijing General Research Institute of Mining & Metallurgy, Beijing 100044, China

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.
- 膨胀合金 /
- 铈 /
- 凝固组织 /
- 错配度
Abstract: 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.
- Invar alloy /
- cerium /
- solidification structure /
- lattice misfit