材料期刊网

Analysis of Hydrogen Diffusion in Metals with Trapping under Local Equilibrium Assumption

YANG Ke CAO Mingzhou WAN Xiaojing SHI Changxu Institute of Metal Research.Academia Sinica , Shenyang , 110015 , China.Shanghai University of Technology.Shanghai , 200070 , China.

材料科学技术（英文）

The assumption of the local equilibrium of hydrogen distribution in metals[1]was used in the model formerly developed[2]to describe the diffu- sion of hydrogen in metals.From the assumption a direct relationship between the hydrogen diffusivity and the hydrogen concentration in metals is estab- lished as D=D_o/{1+N_x(k/p)/[1+C(k/p)]} The comparison between the two results drawn from the assumption of equilibrium and the dynam- ics of hydrogen trapping[3]was also presented.The computation results well explained the scattering phenomenon existed in hydrogen diffusion data and suggested that the experimental conditions should be identical for the study of hydrogen permeation in metals.

关键词: diffusion , null , null

Discovery and Research of High Tc Superconductor in the Institute of Physics, Academia Sinica

CHEN Liquan A special member of CCAST (World Laboratory) , Post Address: Institute of Physics , Academia Sinica , P.O. Box. 603. Beijing , China.

材料科学技术（英文）

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MICROSTRUCTURE AND PROPERTIES OF SiC_w/6061Al COMPOSITE The Author is now with Institute of Metal Research,Academia Sinica,China

MA Zongyi YAO Zhongkai Harbin Institute of Technology , Harbin , China

金属学报(英文版)

The SiC_w/Al composite prepared by squeeze casting has a combination of superior room temperature specific strength and modulus together with excellent thermal properties.The extrusion can make an improvement on the strength and ductility of the composite from 582 MPa as squeeze casted up to 639 MPa,and on the transformation from isotropic to the anisotropic structure.This seems to be explained by the orientation of whiskers and the densification of dislocations in matrix.TEM observation indicates that the stacking fault is the usual planar defect on the SiC_w surface. composite;;SiC whisker;;Al alloy;;microstructure

关键词: composite , null , null , null

An Example of the Scientists—Congratulate Professor SHI Changxu on His Seventyth Birthday

DirectorsBoardofInstituteofMetalResearch , AcademiaSinica

金属学报(英文版)

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Corrosion Science Laboratory,Academia Sinica(CSL AS)

材料科学技术（英文）

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CRYOGENIC MECHANICAL BEHAVIOUR OF MARAGING STEEL CONTAINING HYDROGEN

LIU Zhonghao CHEN Lian Institute of Metal Research , Academia Sinica , Shenyang , China

金属学报(英文版)

Within the range of 77 to 295 K,the strength and plastieity of 18Ni maraging steel increase with decreasing temperature and decrease with increasing hydrogen content.The susceptibility to hydrogen embrittlement of the maraged specimens is superior to solid solution ones.The dislocations after plastically deforming will tangle into dislocation cells which reduce thermselves in size as the temperature decreases,and coarsen as the hydrogen content in- creases.No cryogenie deformation twin was found.The tensile fracture surfaces of the solu- tion and maraged specimens containing 5.90 ppm hydrogen under 295 to 223 K are revealed as quasi-cleavage and intergranular features respectively and as transgranular ones under other experimental conditions.The influence of hydrogen on the mechanical behaviour of steel and the mechanism of hydrogen induced deformation and fracture are discussed. Research Assistant, Institute of Metal Research,Academia Sinica, Shenyang 110015,China

关键词: maraging steel , null , null , null

Luoyang Institute of Refractories Research Ministry of Metallurgical Industry

ZHONG Xiangchong Luoyang Institute of Refractories Research , Luoyang , China.

材料科学技术（英文）

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Technical note: Research and development of localized corrosion rate monitoring instrument for nonpassivable metal in corrosive media

Corrosion

This paper introduces the design of a localized corrosion rate monitoring instrument that can monitor and evaluate the maximum and stable localized corrosion rate of a nonpassivable metal in a corrosive environment by measuring the current density in a corrosion sensor with an occluded anode.

关键词: instrument;localized corrosion rate;monitor

Research on Metal Hydride Compressor System

稀有金属（英文版）

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La对Fe-P-N合金Snoek-Ke-K■ster峰的影响

戢景文 , 魏全金 , 张国福 , 赖祖涵 , 陈廷国

金属学报

研究了F? P—N合金加?对Snoek—Ke-Koster(SKK)峰的影响,发现与合金含La,P的原子浓度比(C_(La)/C_p)有关:对于C_(La)/C_p较大(例如4.56和2.6)的合金,La有明显增强SKK阻?效应:对于C_(La)/C_p=0.27的P过饱和合金,La对SKK峰无明显影响。

关键词: 内耗 , Snoek-Ke-Koster peak , Fe-P-La-N alloy