摘要
以定向凝固Cu Cr自生复合材料为对象 ,研究了凝固方法、凝固速率对凝固组织的影响 ,并观察了断口形貌 ,分析了复合材料的断裂机制。结果表明 :Cu Cr自生复合材料的定向凝固组织是由α基体相和分布于α相间的纤维状共晶体组成。随着凝固速率增加 ,复合材料中的纤维状共晶体分布规整、均匀 ,横向晶界减少 ;断口形貌表明共晶体成为应力的主要承载体 ,共晶体的断裂是自生复合材料断裂的控制机制。
The influences of solidification methods and solidification rates on the microstructure of Cu-Cr in-situ composites were studied. The fracture morphology was observed and the mechanism of the fracture was analyzed. The results show that the structure of the composites consists of α(Cu) matrix phase and fiber-like (α+β) eutectics alternately. With the increase of solidification rate, (α+β) eutectics are distributed evenly and regularly and the boundaries of crystal in transverse direction reduce. The fracture morphology shows that the fracture of eutectic as reinforced phase is the critical factor for the fracture of Cu-Cr in-situ composites.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2004年第3期34-37,共4页
Transactions of Materials and Heat Treatment
关键词
自生复合材料
显微组织
断口形貌
Copper alloys
Eutectics
Fracture
Microstructure
Morphology
Solidification
