Evolution of Nanocrystalline TiBCN Structure with Temperature and Mechanism

• 作 者: Paul K Chu
• 机 构: Department of Physics and Materials Science,City University of Hongkong,Kowloon Hongkong,China,
• 出 处: 稀有金属材料与工程
• 发表日期: 2012年S1期
• 关键词: microhardness crystallite indentation graphite photoelectron amorphous hardness

Evolution of the TiB0.71C3.32N0.79 quaternary nanocomposite structure at 600,700,800,900,and 1000℃ is investigated by high-resolution transmission electron microscopy,X-ray diffraction,X-ray photoelectron spectrometry,and micro-hardness indentation.The nc-Ti(C,N)nanocrystallites exhibit the(200)preferential orientation and the amorphous carbon(a-C)phase gradually transforms into the crystallite graphite phase as the temperature is increased.At 1000℃,the nc-Ti(C,N)nanocrystallites increase to a size of 13 nm but the microhardness diminishes to 18-19 GPa.The corresponding mechanism is discussed.

Evolution of the TiB0.71C3.32N0.79 quaternary nanocomposite structure at 600, 700, 800, 900, and 1000 ° C is investigated by high-resolution transmission electron microscopy, X-ray diffraction, X- ray photoelectron spectrometry, and micro-hardness indentation. (C, N) nanocrystallites exhibit the (200) preferential orientation and the amorphous carbon (aC) phase gradually transforms into the crystallite graphite phase as the temperature is increased. At 1000 ° C, the nc- a size of 13 nm but the microhardness diminishes to 18-19 GPa. The corresponding mechanism is discussed.