摘要
运用残余热应力理论定性地解释了残余热应力对Al2 O3 /Ni金属陶瓷断裂行为和力学性能的影响。Ni颗粒位于Al2 O3 晶内或Ni含量低时 ,在Al2 O3 -Al2 O3 晶界产生张应力 ,易发生沿晶断裂 ;而其位于Al2 O3 晶界或Ni含量高时 ,在Al2 O3 -Al2 O3 晶界产生压应力 ,易产生穿晶断裂。
Effect of residual thermal stresses on fracture behavior and mechanical properties of Al 2O 3/Ni cermets was qualitatively explained by using theory on residual thermal stresses When Ni particles are located within Al 2O 3 grains or Ni content is relatively low, tensile stresses are exerted at Al 2O 3-Al 2O 3 grain boundary While fracturing, intergranular fracture is easily produced When Ni particles are dispersed at Al 2O 3 grain boundary or Ni content is relatively high, compressive stresses are exerted at Al 2O 3-Al 2O 3 grain boundary While fracturing, transgranular fracture is easily produced In general, intergranular fracture model is favorable to enhancement of fracture toughness, and transgranular fracture model is contributed to improvement of bending strength
出处
《材料工程》
EI
CAS
CSCD
北大核心
2002年第12期36-38,43,共4页
Journal of Materials Engineering
