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EFFECT OF GRAIN BOUNDARY ON FATIGUE BEHAVIOUR OF Al BICRYSTALS

LI Qingsheng , (Chingshen Li)Taiyuan University of Technology , Taiyuan , China T.BRETHEAU Laboratory PMTM , CNRS , University Paris Nord Dept.of Mathematics and Mechanics , Taiyuan University of Technology , Taiyuan 030024 , China

金属学报(英文版)

The effect of grain boundaries on cyclic deformation and fatigue crack growth in aluminum bicrystals has been studied.The effect of a grain boundary is restricted in a narrow area, termed as grain boundary affecting zone(GBAZ),where the incompatible plastic strain treats internal stress which conversely promotes inhomogeneous slip in the area and grain boundary cracking.As an extended stage I crack initiated from a notch approaches the grain boundary under a constant cyclic stress,the crack front branches splits into several pieces, meanwhile,the growth rate of the crack reduces to a minimum value at the center of the GBAZ.Such microstructure-sensitive growth of extended stage I cracks is mainly attributed to the grain boundary-induced crack tip sheilding.

关键词: compatibility , null , null , null

THE MARTENSITIC TRANSFORMATION IN(Y,Mg)-PSZ CERAMICS

DAI Zurong LI Baocheng Taiyuan Institute of Mechanical Engineering , Taiyuan , ChinaWU Houzheng CHEN Yuru LIU Wenxi Tianjin University , Tianjin , China

金属学报(英文版)

A dynamic process of the martensitic transformation in(Y,Mg)-PSZ ceramics was observed in situ using TEM.Under the effect of contact stress between tetragonal(t)-ZrO_2 precipi- tates,a group of substructural martensite variants may occur priorly and then another one was induced by the elastic strain relaxation,both form(100)_m twins further.In addition,the crystallography of the martensitic transformation was also discussed.

关键词: ceramics , null , null

DETERMINATION OF DIFFUSIVITY ON TUNGSTEN AND MOLYBDENUM IN DOUBLE GLOW DISCHARGE

LI Zhonghou , SU Yunan , LIU Xiaoping , XU Zhong(Taiyuan University of Technology , Taiyuan , China Manuscript received 17 February 1995)

金属学报(英文版)

This article introduces a method determining the equation of penetration curve by multielement regression(MER) in study of double glow discharge plasma metallizing(DGM) and the slope of the penetration curve can be calculated by derivation,the xdy can also be obtained.This method is more reliable and accurate than graphical integration.The variation of diffusion coefficient with the concentration of W and Mo are determined.

关键词: :diffusivity , null , null , null

PREPARATION AND PROPERTIES OF HYDROGEN STORAGE MATERIAL TiFe WITH AMORPHOUS Si COATING

XU Wenyang LI Jinping DONG Jinxiang PAN Junde Taiyuan Polytechnical University , Taiyuan , China

金属学报(英文版)

An evident improvement on activation properties of hydrogen storage was made by sput- tering an amorphous coating of commercial Si on TiFe alloy.SEM observation revealed an obvious difference between the morphologies before and after hydrogen storage for TiFe alloy with or without amorphous Si coating.It is believed that this may be quite a developable hydrogen storage material.

关键词: amorphous Si , null , null , null

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