摘要
应用电子探针 (EPMA)、扫描电镜 (SEM)和能谱仪 (EDS)对共沉降法制备的Mo -Ti梯度功能材料的化学成分分布、显微组织和断口形貌进行了研究。结果表明 ,试验材料整体致密 ,化学元素分布、显微组织和断口形貌具有梯度变化特征。富Mo区颗粒以机械混合的形式存在 ;以Mo为主要组分的Mo -Ti梯度层 ,也是以机械混合为主 ;以Ti为主要组分的Mo -Ti梯度层 ,主要以多边形 β相存在 ;富钛区钛主要以球形α相存在。富Mo区为沿晶脆性断裂 ,富Ti区为典型的穿晶解理断裂 ,Mo -Ti梯度层以穿晶解理断裂为主 ,还表现出延性断裂特征。
Chemical distribution, microstructures and fractography of Mo-Ti gradient functional materials prepared by co-sedimentation are studied with electron probe microscopic analysis (EPMA), scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS). The experimental sample that has gradual change feature in element distribution, microstructures and fractography is dense as a whole. In the Mo-rich layer, the grains exhibit mechanically mixed, while in Mo-Ti gradient layer with more Mo, the grains exhibit mechanically mixed mainly. However, in Mo-Ti gradient layer with more Ti, there is more polygonal β phase. In the Ti-rich layer, Ti exists mainly as spherical α phase. The Mo-rich layer shows brittle fracture along grain boundaries. In the Ti-rich layer, fracture is typical intergranular cleavage. Fractured surface of Mo-Ti gradient layer reveals feature of ductile fracture besides intergranular cleavage.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2003年第6期47-51,共5页
Aerospace Materials & Technology
