2016 年 5 巻 4 号 p. 259-265
A tensile test and a stress relaxation test were carried out using nano-sized Ag particles pressureless sintered at two levels of temperature to investigate the effects of sintering temperatures on the creep mechanism of sintered nano-sized particles. Inverse analysis using micro scale FEM model revealed that the creep stress exponent of the compact portion in the sintered nano-sized Ag particles was close to the value of dislocation creep. However, the sintered nano-sized Ag particles have a different type of creep mechanism from that of bulk Ag, regardless of sintering temperature levels. This creep is considered to be resulted from the low quality grain boundary structure. And the grain boundary quality does not improve with an increase in sintering temperature. Since the deformation in the low quality grain boundary is considered to be dominant on microscopic behavior of sintered body, sintered nano-sized Ag particles exhibit extremely brittle behavior compared to pure metals.
