材料期刊网

Corrosion Resistance on High Strength Bainitic Steel and 09CuPCrNi After Wet-Dry Cyclic Conditions

WANG Zhi-fen , YIN Fu-xing , WU Li-xin , SUN Yi-qiang , ZHANG Wan-lin

钢铁研究学报(英文版)

关键词:

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

离子渗氮马氏体不锈钢的微观组织与腐蚀行为

李成涛 , 赵彦芬 , 方可伟 , 赖云亭 , 刘艳 , 沈剑 , 张路 , 薛飞

材料热处理学报

采用扫描电镜、X射线衍射(XRD)、极化曲线和显微硬度等方法研究表面离子渗氮X12Cr13马氏体不锈钢的渗氮层成分、显微组织结构、硬度以及腐蚀性能.结果表明:离子渗氮马氏体不锈钢表面形成了70μm的渗氮层,渗氮层由化合物层和扩散层组成,化合物层的组成相主要为γ-FeN和ε-FeN.离子渗氮不锈钢经过72 h纯水浸泡后表面发生点蚀.基体内部向表层的扩散降低了钢中的固溶铬含量以及渗氮层形成的孔隙和裂纹共同降低马氏体不锈钢的耐腐蚀性.

关键词: 马氏体不锈钢 , 离子渗氮 , 腐蚀 , 化合物层

LC4铝合金稀土转化膜耐蚀性及影响因素

张巍 , 李久青 , 许江涛 , 陈昆

腐蚀学报（英文） doi:10.3969/j.issn.1002-6495.1999.06.004

开发了IC4铝合金稀土转化膜碱性两步成膜工艺ZH1,利用正交优化设计方法确定了最佳工艺参数.采用多种实验方法研究了经ZH1处理的LC4铝合金在氯化物环境中的耐蚀性及其影响因素,结果表明:经ZHI工艺处理过的LC4铝合金耐全面腐蚀和点蚀性能均有明显提高,稀土转化膜既抑制了腐蚀的阴极过程,也抑制了阳极过程.具有ZH1转化膜的LC4铝合金对氯离子浓度和pH值的变化不甚敏感.

关键词: 高强铝合金 , 稀土转化膜 , 耐蚀性学科

氮离子束轰击W18Cr4V高速钢的表面效应

吕树国 , 刘常升 , 张罡 , 李玉海 , 毕监智 , 金光

材料与冶金学报 doi:10.3969/j.issn.1671-6620.2009.01.012

采用俄罗斯UVN 0.5D2I离子束辅助电弧离子镀沉积设备,对高速钢W18Cr4V基材表面进行氮离子束轰击,研究了氮离子束轰击能量对表面形貌、相结构及显微硬度的影响.研究表明:氮离子束轰击后基材表面原有划痕消失,表面趋于光滑.表面层出现(Fe,Cr),CrN,Cr2N和FeN相;随着氮离子束轰击能量的增加,(Fe,Cr)相结构未发生变化,CrN(111)衍射峰逐渐增强,Cr2N(211)衍射峰逐渐减弱;FeN(210)衍射峰先增强而后消失,出现Fe2N相.氮离子束轰击后的表面显微硬度由原来的900HV0.01升高到1 230 HV0.01.

关键词: 离子束 , 显微硬度 , 相结构 , 高速钢

纳米化3J33钢低温渗氮生成相性能第一性原理表征

闫牧夫 , 刘瑞良 , 吴业琼 , 杨茂

材料热处理学报

采用固溶处理、热轧、冷拔变形和电加热的复合技术实现了3J33马氏体时效钢纳米化,平均晶粒尺寸约为70nm.对纳米化的马氏体时效钢分别在390℃和360℃进行8h脉冲等离子体渗氮,利用XRD、显微硬度计和纳米硬度计对渗氮层生成相和性能进行了测试,并且基于第一性原理对渗氮相的性能进行了表征.结果表明,两个温度下渗层中生成的氮化相分别为γ'-Fe4N和FeN0.076,二者均具有较高的硬度和良好的塑性.计算结果表明,γ'-Fe4N和FeN0.076相中N与Fe原子的成键作用较强,且两相都具有延性.

关键词: 3J33钢 , 纳米化 , 低温离子体渗氮 , FeN0.076 , 第一性原理表征

Effect of interstitial hydrogen on cohesive strength of Al grain boundary with Mg segregation

材料科学技术（英文）

The effect of interstitial hydrogen on the cohesion of the Al Sigma=11(113) grain boundary (GB) is investigated based on the thermodynamic model of Rice-Wang using the first-principles density function calculation. The results indicate that interstitial H behaves as an embrittler from "strengthening energy" analysis. The reduced GB cohesion due to the presence of H at the GB is attributed to the low affinity between H and Al, and the weakened bonding of Al atomic pairs perpendicular to GB plane.

关键词: hydrogen;grain boundary;Al-Mg alloys;pseudopotentials;1st-principles

Effect of Interstitial Hydrogen on Cohesive Strength of Al Grain Boundary with Mg Segregation

Xiaoguang LIU , Xiaowei WANG

材料科学技术（英文）

The effect of interstitial hydrogen on the cohesion of the Al ∑=11(113) grain boundary (GB) is investigated based on the thermodynamic model of Rice-Wang using the first-principles density function calculation. The results indicate that interstitial H behaves as an embrittler from "strengthening energy" analysis. The reduced GB cohesion due to the presence of H at the GB is attributed to the low affinity between H and Al, and the weakened bonding of Al atomic pairs perpendicular to GB plane.

关键词: Hydrogen , null , null

甲酰胺浓度对38CrMoAl钢液相等离子电解渗氮过程的影响

钟芳兴 , 陈雄清 , 周贤良 , 华小珍 , 许武波

材料热处理学报

采用液相等离子电解渗氮技术,研究了不同甲酰胺浓度对38CrMoA1钢渗氮层组织及性能的影响.利用OM、SEM、XRD观察分析渗氮层的微观组织结构和物相构成,RF-GDOES和Parstat 2273电化学工作站分别表征渗氮层的元素分布和耐蚀性,并测试分析了渗层截面的显微硬度.结果表明,随着电解液中甲酰胺浓度的升高,渗氮致密层、白亮层、扩散层厚度呈先增加后降低的趋势,渗氮层最大显微硬度值呈增加的趋势;当甲酰胺浓度升高至70％时渗氮层达到最大,为125 μm,白亮层为51 μm;渗氮后扩散层硬度值较高,而心部组织硬度较未处理试样提升约2倍;渗氮层表层主要含Fe2N和Fe3N相,扩散层以Fe16N2、FeN相为主,过渡层主要为α-Fe、FeN0.097相;渗氮层的耐蚀性优于未经处理试样.

关键词: 液相等离子电解渗氮 , 甲酰胺浓度 , 组织结构 , 腐蚀