摘要
本文利用放电等离子烧结技术制备了致密的Ti Al2 O3复合材料。实验结果表明 ,6 0vol%Al2 O3和80vol%Al2 O3的Ti Al2 O3复合材料 ,界面处生成少量的TiAl,使得Ti与Al2 O3间的界面能大于其单个晶粒的界面能 ,复合材料性能随Ti含量的增加而增大 ;4 0vol%Al2 O3和 2 0vol%Al2 O3的Ti Al2 O3复合材料 ,界面处生成脆性的Ti3Al相 ,使得Ti与Al2 O3间的界面能小于各自晶粒的界面能 ,材料的性能随Ti含量的增加而降低 ,同时断裂的模式也发生改变 ,由穿晶断裂为主转变为沿晶断裂 ,脆性的Ti3Al相是Ti Al2 O3复合材料力学性能降低的主要原因。
The full dense Ti/Al 2O 3 composites were obtained by spark plasma sintering. The properties of Ti/60vol%Al 2O 3 and Ti/80vol%Al 2O 3 composites were increased with titanium content increasing, which was interfacial energy of Ti-Al 2O 3 bigger than interfacial energy of Ti-Ti and Al 2O 3-Al 2O 3 due to forming TiAl in the interface. However, the properties of Ti/40vol%Al 2O 3 and Ti/20vol%Al 2O 3 composites were decreased with titanium content increasing. That is reason that the interfacial energy of Ti-Al 2O 3 lower than interfacial energy of Ti-Ti and Al 2O 3-Al 2O 3 because of creating brittle Ti 3Al which was main reason resulting in decreased the properties of Ti/Al 2O 3 composites, and what's more, the fracture mode was changed from main transgranular fracture to mixture of intergranular and transgranular fracture.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第6期799-801,共3页
Journal of Materials Science and Engineering
基金
国家自然科学基金重点资助项目 (50 2 32 0 2 0 )
山东省自然科学基金资助项目(2 0 0 2F2 1 )
