摘要
以Al-11wt%Mg合金为基体,十面体准晶相Al72Ni12Co16为增强颗粒,通过机械搅拌的方法制备Al72Ni12Co16/Al-11wt%Mg复合材料。采用扫描电镜和能谱分析研究了该复合材料的微观组织及成分,并研究了该复合材料在制备过程中的相转变。实验发现:Al72Ni12Co16颗粒在加入到Al-11wt%Mg基体中后发生破碎和钝化,由于颗粒推移效应而均匀分布于晶界处。颗粒和基体间的原子相互扩散,导致颗粒发生如下相转变:D-Al72Ni12Co16→θ-Al80Ni4.5Co15.5,同时在凝固过程中有β-A13Ni相析出。
The composites, using Al-11wt% Mg and Al72Ni12Co16 decagonal quasicrystal as matrix and reinforced particles respectively, were fabricated by mechanical stirring method. The microstructure and chemical composition of Al72Ni12Co16/Al-11wt% Mg composites were characterized by SEM and energy dispersive spectrum （EDS） analysis. The phase transformation in the fabrication processing was studied as well. The results show that Al72Ni12Co16 particles were fractured, passivated, and distributed uniformly on the grain boundary due to particle pushing effect. The mutual diffusion between the particles and matrix cause the particle phase transformation： D-Al72Ni12Co16→θ-Al80Ni4.5Co15.5. Meanwhile β-A13Ni is precipitated in solidification process.
出处
《铸造技术》
CAS
北大核心
2007年第11期1431-1435,共5页
Foundry Technology
基金
国家自然科学基金项目(NO50571081)
航空科学基金项目(No04G53042)资助
关键词
准晶相颗粒
复合材料
机械搅拌
微观组织和成分
相转变
Qluasicrystal particle
Composites
Mechanical stirring
Microstructure and chemical composition
Phase transformation
