材料期刊网

A RENORMALIZATION-GROUP APPROACH TO THE POTTS-MODEL ON ONE-DIMENSIONAL QUASI-LATTICES

Journal of Physics-Condensed Matter

A decimation renormalization is constructed and used to produce an exact RG recursion relation for the Potts model on one-dimensional quasilattices. The geometrical properties and critical properties of some one-dimensional quasilattices are discussed.

关键词: chain

ASYMMETRIC INTRINSIC LOCALIZED MODES IN A HOMOGENEOUS LATTICE WITH CUBIC AND QUARTIC ANHARMONICITY

Physical Review B

The intrinsic localized modes in a homogeneous nonlinear one-dimensional lattice are investigated by use of the method of multiple scales combined with a quasidiscreteness approximation. It is shown that, in the presence of cubic anharmonicity, some asymmetric intrinsic localized modes with zero-group velocity can exist in the lattice and that the eigenfrequencies of these localized modes are above the top of the harmonic frequency band.

关键词: chain

预处理组织对20CrMnMo钢气体渗氮耐磨性的影响

高翔 , 邵丹 , 谢鲲 , 赫庆坤 , 程相征 , 孙金全

材料热处理学报

针对农用20CrMnMo链条轴渗碳淬火疲劳寿命低的工程应用现状,本文通过对20CrMnMo进行调质、淬火、淬火+低温回火不同预先热处理,然后进行低温气体渗氮,探讨提高链轴抗疲劳寿命热处理工艺.通过金相、显微硬度仪、扫描电镜、电子探针对渗层组织和成分进行了分析;采用摩擦磨损试验机、链条台架实验机,三维形貌仪对链轴的耐磨、抗疲劳性能进行了评价.结果表明:经过调质预处理的试样能够得到均匀、致密的渗层组织,渗层深度500 μm,渗层硬度梯度平缓,其耐磨性能优于碳氮共渗的链轴.

关键词: 链条 , 低温渗氮 , 20CrMnMo , 表面纳米化 , 耐磨性