摘要
利用高分辨电镜（ＨＲＥＭ）及场发射电镜纳米尺度成分分析技术（ＥＤＳ分析）研究了机械合金化和真空热压技术制备 的纳米 ＮＩＡＩ块体材料的微观结构． ＨＲＥＭ及 ＥＤＳ分析结果表明在球磨过程中形成第二相粒子 Ａｌ２Ｏ３分布于 ＮｉＡｌ晶粒内 部或边界上，分布于晶粒边界上的 Ａｌ２Ｏ３对晶界起钉扎作用，有效地抑制晶粒长大；此外，观察到纳米晶粒间存在无序区，这些
The microstructure of bulk nanocrystalline NiAl (NC-NiAl) synthesized by mechanical alloying (MA) and hot pressing has been revealed by high-resolution electronic microscopy (HREM) and the energy dispersive X-ray spectroscopy (EDS) analysis. Results show that the second phase particles, Al2O3, formed during MA distribute within NiAl grains or at the boundaries of NiAl, which contributes to inhibiting the grain growth. In addition, disordered regions between NiAl grains have also been observed, which also contributes to inhibiting the grain growth.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第9期907-912,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金!59895156
863资助项目
