材料期刊网

STRESS CORROSION CRACKING IN 16NiCo STEEL

P.Zhang , B.Z Guand B. Ling (Beijing Institute of Aeronautical Materials , Beijing 100095 , China)

金属学报(英文版)

The dst of tempering temperature on strength, impact toughness, fracture toughness and stress corrosion cracking (SCC) behavior of 16NiCo Steel in an aqueons solutiou of 3.5 pct NaCl was stndied. The test compromise between strength, tonghness, and SCC resistance was obtained after 510℃ tempering. Under these conditions, KISCC is~75 MPam with fracture toughness of~75 MPam, impact toughness of~150J/cm2 and a gield strength of~1580 MPa. The improved stress corrosion crack-ing resistance at 510℃ tempering may be related to the loss of stress resulting from M2C/matrix coherency and the recovery of the dislocalion substrvcture. These would lead to a decreased concentration of hydrogen.

关键词: streas corrosion , null , null

Preparation of Li-B alloy and study of its microstructure and discharge characteristics

Zhijian LIU , Zhiyou LI , Wei DUAN , Xuanhui QU , Baiyun HUANG , Siqi ZHANG

材料科学技术（英文）

A LI-B alloy has been prepared using a pretreated amorphous B powder and pure Li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated. Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the Li7B6 would be more finery distributed in the metal Li by means of intensified stirring. The discharge characteristic of the Li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B.

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阿莫西林对B-Z振荡反应的影响及其振荡指纹图谱

赖红伟 , 曹宏梅 , 董顺福 , 韩丽琴 , 陆钊 , 董树国 , 贾骐羽

应用化学 doi:10.3724/SP.J.1095.2014.30321

研究了阿莫西林对B-Z振荡反应的影响,结果表明,阿莫西林的加入明显地改变了振荡体系的周期和振幅,即对振荡体系产生扰动,且阿莫西林的浓度分别在1.5×10-5～2.4×10-3mol/L和4.7 × 10-5～4.8×10-3 mol/L范围内与振荡周期改变值Δt和振幅改变值ΔA均呈良好的线性关系,相关系数分别为0.9822和0.9846,同时结合FKN机理,初步探讨了阿莫西林扰动B-Z振荡反应的机理.

关键词: 阿莫西林 , 化学振荡 , 指纹图谱 , B-Z振荡

Fluence Dependence of Mean Sputter Depth for Bombarded Pt-Cu and ~(10)B-~(11)B Binary Materials

Liping ZHENG(Shanghai Institute of Nuclear Research , Chinese Academy of Sciences , Shanghai 201800 , China)(To whom correspondence should be addressed)Risheng LI(Laboratory of Atomic Imaging of Solids , Institute of Metal Research , Chinese Academy of Sciences

材料科学技术（英文）

The mean sputter depth depends on the surface composition gradient during ion implantation.For the high fluence ion implantation into a Pt-Cu alloy, the surface composition gradient of Cu is so large that the difference in mean sputter depth between Pt and Cu, is significant. However, for the high fluence ion implantation into 10B-11B isotope mixture, the surface composition gradient of 10B is so small that the difference in mean sputter depth between 10B and 11B is insignificant.

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FLUENCE DEPENDENCE OF MEAN SPUTTER DEPTH FOR BOMBARDED PT-CU AND B-10-B-11 BINARY MATERIALS

材料科学技术（英文）

The mean sputter depth depends on the surface composition gradient during ion implantation. For the high fluence ion implantation into a Pt-Cu alloy, the surface composition gradient of Cu is so large that the difference in mean sputter depth between Pt and Cu, is significant. However, for the high fluence ion implantation into B-10-B-11 isotope mixture, the surface composition gradient of B-10 is so small that the difference in mean sputter depth between B-10 and B-11 is insignificant.

关键词: monte-carlo simulation;elements

Image analysis of periodic rain accelerated corrosion of aeronautical aluminium alloys

Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing

Periodic rain tests have been carried out for simulating atmospheric corrosion of aeronautical aluminium alloys. A digital image preprocessing and analysis method based on wavelet transformation was used to study the corrosion morphology of aluminium alloys samples, through which an image feature parameter 8 was extracted and discussed. The influences of orthogonal experiment parameters on acceleration were analyzed according to image feature parameter 6 with analysis of variance (ANOVA) method, and the optimal parameters for accelerated corrosion test were also obtained. The result was shown to be consistent with that from weight loss method. (c) 2007 Elsevier B.V. All rights reserved.

关键词: aeronautical aluminium alloys;accelerated corrosion;linage analysis;simulated environment;atmospheric corrosion;electrochemical impedance;pitting corrosion;exposure;steel;zinc

Enhanced remanence and high product energy of Fe3B-based nanocrystalline magnetic materials

Nanostructured Materials

This paper presents new results of an investigation of a commercial rapidly quenched Nd4.5Fe77B18.5 alloy that was studied previously. The enhanced remanence Jr = 13.2 KGs and high product energy (BH)max = 16.2 MGOe are shown to be due to ultrafine grain. The microstructure, consisting of no alpha-Fe that results in optimum magnetic properties, occurs in the amorphous Nd4.5Fe77B18.5 alloy after crystallization. The coexistence of Fe3B, Nd2Fe14B and residual amorphous phase play dominant roles in the achievement of the hard magnetic properties, and hence, the amorphous phase seems to act as an effective magnetic exchange-coupled medium.

关键词: alloys

EFFECT OF AN ELASTIC-PLASTIC SHOCK-WAVE .B. ON THE FATIGUE CRACK-GROWTH RATE OF WELDED-JOINTS

Fatigue & Fracture of Engineering Materials & Structures

Fatigue crack growth behavior in welded joints subjected to elastic-plastic shock waves was investigated using three-point-bend specimens. The results indicate that the fatigue crack growth rate is reduced in the affected region of elastic or plastic waves. The travel of a plastic stress wave reaches 10 to 13 mm depth, but the hardness in this region is not increased although the lattice distortion is high. The crack path morphologies were observed, and reasons for a decrease in crack growth rate are presented.

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Decomposition of B4C and magnetic properties of Nd-Fe-(B,C) alloys synthesized by mechanical alloying

Journal of Alloys and Compounds

Nd-Fe-(B.C) alloys have been synthesized by mechanical alloying and subsequent heat-treatment, with B4C as one of the starting materials. It is found that when the pure B4C is milled alone, it proves difficult to decompose. When the B4C compound is milled with Nd and Fe, the complete decomposition of B4C and the formation of Nd2Fe14(B,C) phase is observed. Furthermore, the competition between B and C atoms for entering the Nd2Fe14B lattice. the effects of the B4C content on the structure and the magnetic properties of Nd2Fe14(B,C)-based alloys are investigated. A coercivity as high as 18.3 kOe and the maximum energy product of 10.4 MGOe have been achieved for the Nd-Fe-(B,C) alloys. (c) 2005 Elsevier B.V. All rights reserved.

关键词: permanent magnets;mechanical alloying;fe-c alloys;permanent-magnets;r2fe14c;nd

Upgrade of beamline 3W1B at Beijing Synchrotron Radiation Facility

中国物理C doi:10.1088/1674-1137/37/5/058001

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