富Ce稀土对多元Al-Si活塞合金凝固组织的影响
Effect of Ce-rich Rare Earth on Solidification Microstructure of Multicomponent Al-Si Piston Alloy
刘铁羽 1董雄博 1段洪波 1夏峰 1杨伟 1王建利 1李建平1
作者信息
- 1. 西安工业大学 材料与化工学院 陕西省铝镁轻合金复合材料工程研究中心,陕西 西安 710021
- 折叠
摘要
采用DSC以及光学显微镜与扫描电镜研究了富Ce稀土(0.1wt%,0.3wt%,0.5wt%)对多元近共晶Al-11.5 Si-4Cu-2Ni-1Mg-0.5Fe(wt%)活塞合金凝固组织的影响.发现富Ce稀土加入对该合金的共晶硅和多种第二相的凝固温度、形态与体积分数均有明显影响.富Ce稀土的加入,使Al-Si共晶温度降低,T-Al9FeNi相和δ-Al3CuNi相析出温度升高.富Ce稀土加入量 0.3wt%时,共晶硅变质效果最佳,T-Al9FeNi相由初始的板条状转变为小块状,体积分数减小到3.22vol%,δ-Al3CuNi相由初始的片状转化为鱼骨状,体积分数增加到 6.47vol%.富Ce稀土中La、Ce原子在凝固过程中富集在固液界面前沿,增大了成分过冷,细化共晶组织.当富Ce稀土含量为 0.5wt%时,合金中出现长针状富稀土相.
Abstract
The effect of Ce-rich rare earth(0.1wt%,0.3wt%,0.5wt%)on the solidification microstructure of multivariate near-eutectic Al-11.5Si-4Cu-2Ni-1Mg-0.5Fe(wt%)piston alloy was studied by DSC,optical microscopy and scanning electron microscopy.It is found that the addition of Ce-rich rare earth has obvious effects on the solidification temperature,morphology and volume fraction of eutectic silicon and various second phases of the alloy.The addition of Ce-rich rare earth reduces the Al-Si eutectic temperature and increases the precipitation temperature of T-Al9FeNi phase and δ-Al3CuNi phase.When the addition of Ce-rich rare earth is 0.3wt%,the modification effect of eutectic silicon is best,T-Al9FeNi phase changes from the initial lath shape to the small block shape,the volume fraction decreases to 3.22vol%,and the δ-Al3CuNi phase changes from the initial flake shape to fishbone shape,the volume fraction increases to 6.47vol%.La and Ce atoms in the Ce-rich rare earth are enriched at the front of the solid-liquid interface during the solidification process,which increases the compositional supercooling and refines the eutectic structure.When the content of Ce-rich rare earth is 0.5wt%,long needle-like rare earth-rich phase appears in the alloy.
关键词
铝-硅活塞合金/变质/共晶硅/富铈稀土Key words
Al-Si piston alloy/modification/eutectic silicon/Ce-rich rare earth引用本文复制引用
基金项目
陕西省重点研发计划(2020ZDLGY13-01)
西安市智能兵器重点实验室项目(2019220514)
西安市智能兵器重点实验室项目(SYS020CG042)
出版年
2024
NETL
NSTL
万方数据