材料期刊网

A MICROSTRUCTURAL ANALYSIS OF 7050 Al ALLOY

JIN Yan LI Chunzhi ZHAO Yingtao YAN Minggao Beijing Institute of Aeronautical Materials.Beijing , China

金属学报(英文版)

The microstructure of 7050 AI alloy in T74 condition has been studied by means of transmis- sion electron microscopy and dynamical diffraction simulation.It was found that the alloy studied contains mainly AI3Zr superlattice phase,η′-phase and Al_7Cu_2Fe constituent phase. The η′-phase has an orthorombic crystal structure with a=0.492 nm,b=0.852 nm and c=0.701 nm.The orientation relationship between the η′-phase and matrix was determined as(101)_m∥(010)_(η′)[111]_m∥[001]_(η′)

关键词: 7050 Al alloy , null , null , null

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词: stress corrosion cracking , null , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

关键词:

Abstracts of papers from Journal of University of Science and Technology Beijing

稀有金属（英文版）

关键词:

Towards the ultimate storage ring: The lattice design for Beijing Advanced Photon Source

中国物理C doi:10.1088/1674-1137/37/5/057003

关键词:

Institute of Materials Science at Jilin University——A Brief Overview

WANG Yuming Institute of Materials Science , Jilin University , Changchun , 130023 , China

材料科学技术（英文）

关键词:

The Second International Conference on HSLA Steels Beijing,China,October 1990 Organized by THE CHINESE SOCIETY OF METALS

金属学报(英文版)

关键词:

Upgrade of beamline 3W1B at Beijing Synchrotron Radiation Facility

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

关键词:

’99北京国际热处理展览会(CHT’99，Beijing)

兵器材料科学与工程

关键词:

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