An investigation into the properties of nanocrystalline(NC)materials with sample lengths less than 30 mm seems to be a challenge by using conventional mechanical spectroscopy(MS).We use a newly developed frequency mod...An investigation into the properties of nanocrystalline(NC)materials with sample lengths less than 30 mm seems to be a challenge by using conventional mechanical spectroscopy(MS).We use a newly developed frequency modulation acoustic attenuation mechanical spectroscopy(FMAA-MS)to investigate phase transition in Ni68Fe32 NC alloy(22 nm)where the length of the sample is 10 mm.An internal friction peak accompanied by an abrupt increase in resonant frequency occurs at 641 K,which originates from order-disorder phase transition,confirmed by a vibrating sample magnetometer and differential scanning calorimetry.展开更多
基金by the National Basic Research Program of China under Grant No 2010CB631004the Fundamental Research Funds for the Central Universities(1112021302,1106021343 and 1116021301)the PAPD,and the National Natural Science Foundation of China(11004098,50831004,51001060).
文摘An investigation into the properties of nanocrystalline(NC)materials with sample lengths less than 30 mm seems to be a challenge by using conventional mechanical spectroscopy(MS).We use a newly developed frequency modulation acoustic attenuation mechanical spectroscopy(FMAA-MS)to investigate phase transition in Ni68Fe32 NC alloy(22 nm)where the length of the sample is 10 mm.An internal friction peak accompanied by an abrupt increase in resonant frequency occurs at 641 K,which originates from order-disorder phase transition,confirmed by a vibrating sample magnetometer and differential scanning calorimetry.
