TEMPERATURE AND LOADING RATE EFFECTS ON FRACTURE PROPERTIES OF NI-3(ALFE)

The experiment in this paper on Ni-3(AlFe) has shown that the fracture energy depends greatly on loading rates and temperatures. When the te mperature is higher than 600 degrees C, the fracture energy drops to n early zero and the corresponding fracture path is intergranular. Incre asing loading rate can lessen the embrittlement. When the temperature is at about 300 degrees C, the material shows the highest toughness, a nd fracture is transgranular. The experiment shows that the fracture b ehaviour is strongly environmentally dependent. The temperature and lo ading rate can increase ductility and can also decrease it.