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TEM Investigation of Nitrided Inconel 690 Prepared by Low Temperature Plasma Assisted Processes
Xiaona Li,Chuang Dong,Henry Michelh,Huan He,Shengzhi Hao,Thierry Czerwiec 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Low-temperature plasma assisted nitriding (PAN) treatment was used to produce a highly nitrogen-enriched N layer on the nickel-based superalloy Inconel 690. Such a layer showed greatly improved wear and corrosion performance. In this paper, we investigate the microstructure of the N layers thoroughly by using transmission-electron microscopy and XRD. As a comparison, nitriding layers were also prepared by the reactive magnetron sputtering technique. It was found that the nitrogen-enriched ¯lm deposited at 400 ±C by RMS consists of mainly CrN-type nitride and fcc ° phase and a small amount of °N phase, while the PAN treatments at 400 ±C on bulk samples produce only N single-phase layer with gradually changing lattice parameters from the outermost surface to the underlying substrate in the range of 0.393 to 0.355 nm.
A Study on Fracture Behavior and Impact Stability of Sintered Rare-earth Permanent Magnets
Li Wei,Li Anhua,Wang Huijie,Dong Shengzhi,Guo Yongquan 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The fracture behavior and mechanical characteristics of sintered rare-earth magnets were investigated. It shows that the fracture behavior and bending strength of the magnets obviously exhibit anisotropy. Sm-Co magnets tend to cleavage fracture in the close-packed (0001) plane or in the (10 11 ) plane. The fracture mechanism of Nd2Fe14B magnet mainly appears to be intergranular fracture. The anisotropy of fracture behavior and mechanical strength of sintered rare-earth magnets is caused mainly by the strong crystal-structure anisotropy and the grain alignment texture. The effects of Nd content, and Pr, Dy substitution on the impact stability of Nd2Fe14B magnets were also reported.