LI Hui Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaLIU Xiang Northeast Institute of Technology
,
Shenyang
,
ChinaGUO Jianting HU Zhuangqi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Associate Professor
,
Institute of Metall Research
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
By means of nonstoichiometry,rapid solidification and adequate boron addition,the tensile strength and bending resistance of Ni_3Al has been improved.When adding 0.52 to 1.37 at.-% B into Ni_3Al,which has the beneficial effect on the ductility.If boron addition is too high, there are coarse Ni_(23)B_6 particles and NiB_(12) phases found at the grain boundaries.Boron modification in Ni_3Al promotes the ordering in the region near grain boundaries.The grain boundary of boron free Ni_3Al is a large angle one,but turns into a small angle grain bound- ary with sub-grains of dislocation characteristics when the boron content in Ni_3Al reaches 1.37 at.-%.
关键词:
intermetallic compound
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null
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null
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null
SUN Dongsheng LI Fengzhao Shandong Polytechnic University
,
Jinan
,
Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaDAI Jiyan LI Douxing Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China associate professor
,
Institute of Materials Engineering
,
Shandong Polytechnic University
,
Jinan 250014
,
China
金属学报(英文版)
Observation under high resolution electron microscope shows that the continuous bombing of high speed ions produces a great amount of vacant site defects.The assembly of vacancies forms vacant dish,and the collapase of vacant dish forms stacking fault tetrahedrons and oth- er crystal defects.The interfaces between phase ε(Fe_(2-3)N)and phase γ'(Fe_4N)are smooth, straight and coherent,and they have the orientation relationships of(11)//(0001)and [110]/[110] .
关键词:
crystal defect
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null
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null
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null
ZENG Xianghua
,
SHA Jiande
,
SU Ge Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaYUAN Jigang LIU Fumei ZHONG Huiwen Southwest Aluminium Mill
,
China National Nonferrous Metals Industry Corporation
,
Chongqing
,
China SHA Jiande
,
Engineer
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The end grain attack of LDIOCS aluminium alloy plates during chemical milling in hot aqueous solution of sodium hydroxide has been studied.The results show that the microsegregation of some components,i.e.Cu,Si etc.,is the main reason of the end grain at- tack,and it is affected by the conditions of heat treatment as well.The end grain attack significantly diminishes while some technical measures which are beneficial to the reduce of segregation were taken during melting and casting.
关键词:
aluminium alloy
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null
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null
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SUN Xiukui CHEN Wenxiu XU Jian FAN Xueshu WEI Wenduo State Key Laboratory of Rapidly Solidified Non-Equilibrium Alloys
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaWU Yukun PENG Yingguo Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Associate Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The crystal habit,crystalline structure,surface condition and composition of the ultrafine Al particles prepared by inert gas evaporation method were studied in detail by means of high resolution transmission electron microscope,X-ray diffraction and X-ray photo-electron spectrum.The results indicate that the ultrafine Al particles prepared in high pure inert gas are of clear crystal habits,single crystal in a large majority and fcc crystalline structure with a_0=0.405 nm.It is also found on the surface of the Al particles that there is a layer of amor- phous Al_2O_3 with 2 nm average thickness,which could protect the particles against oxidizing further.Therefore,the ultrafine Al particles prepared by the inert gas evaporation method are very stable in atmosphere.
关键词:
ultrafine Al particle
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null
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null
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null
ZHANG Lixin Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
ChinaQU Zhe LI Liguang WEI Wenduo Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China ZHANG Lixin Associate Professor
,
Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The present work is to study the effect of phosphorus on the annealing texture of a low carbon steel at different cold rolling and annealing condition by means of pole-figure,inverse-pole figure and orientation distribution function(ODF)method.The microstructure and distribu- tion of phosphorus in steel sheet are studied by means of metallography,scanning electron mi- croscope(SEM)and electron probe microanalysis(EPMA).The results show that phos- phorus promotes the formation of the fiber texture of〈011〉parallel to the rolling direc- tion and〈111〉normal to the sheet surface.The texture was found to be affected mainly by preannealing temperatures,promoted at 390 or 590℃,and retarded at 490℃.At the preannealing temperature promoting the formation of texture,phosphorus segregation to the interior of grains was observed.It seems that the formation of the fiber texture may be associ- ated with the segregation of phosphorus.
关键词:
low carbon steel
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null
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null
ZHAO Lihua
,
WU Lijun
,
HUANG Qizhong
,
YANG Qiaoqin 1)(Material Research and Test Center
,
Hunan University
,
Changsha
,
China)2)(Powder Metallurgy Research Institute
,
Center-South University of Technology
,
Changsha
,
China)3)(Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Chinese Academy of Science
,
Shenyang
,
China)Manuscript received 18 April 1995
金属学报(英文版)
C-B4C-SiC composites with silicon additive obtained by the hot press sintering method are studied by means of transmission electron microscopy(TEM).When the specimens are heated to 1800℃,their structure does not change.When the specimens are heated to 2000℃,carbon begins to graphitize. Moreover,two monoclinic phases are observed.One monoclinic phase named as the M phase belongs to C-center monoclinic lattice with a=0.90nm,b=0.59nm,c=0.54nm and β=119.3°.The other monoclinic phase named as the Ml phase also belongs to C-center monoclinic lattice but with a=0.85nm,b=0.49nm,c=0.53nm and β=123.6°.
关键词:
:C-B_4C-SiC composite
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null
WAN Lijun Dalian Maritime University
,
Dalian
,
Liaoning
,
China CHEN Baoqing Dalian Institute of Technology
,
Dalian
,
Liaoning
,
China GUO Kexin(K.H.KUO) Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Institute of Metal and Technology
,
Dalian Maritime University
,
Dalian
,
Liaoning
,
China
金属学报(英文版)
A new phase was found at the interface between Al film and Ni substrate when the time of ion-plating reaches 5 min.It was identified to be body centered tetragonal lattice with the constants a=b=0.588 nm,c=0.480 nm.The variation of microstructure and phases with the ion-plating time were observed.Based on these results,the ion-plating film formation mech- anism has been also discussed.
关键词:
magnetron sputtering
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null
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null
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null
GE Yunlong YANG Yuansheng JIAO Yuning HU Zhuangqi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaGAO Yunyan JIA Guanglin Northeast University of Technology
,
Shenyang
,
China associate professor
,
Institute of Low Energy Nuclear Physics
,
Beijing Normal University
,
Beijing
,
100875
,
China
金属学报(英文版)
A new technique of centrifugal casting under electromagnetic field was firstly proposed and investigated.Taking a heat resisting alloy steel 25Cr20Ni and an Al-Cu alloy as examples,products,though their length,diameter and wall thickness are varied,re- vealed so superior macrostructures that the mechanical properties are much improved in comparison with conventional centrifugal casting.
关键词:
electromagnetic field
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null
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null
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null
LI Yundong
,
ZHANG Tianxiang
,
ZHENG Zhi
,
ZHU Yaoxiao Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The solid solubilities of 15 common alloying elements added to the Ll_2-type intermetallic compound Ni_3Si at 900°C have been estimated,and their substitution modes have been de- duced from the direction of solubility lobe of the compound.It is shown that the alloying behaviours in Ni_3Si are determined by both size and electronic factors,i.e.,the substitution mode is governed by electronic configuration and solubility by the both.An interaction parameter is presented to describe quantitatively the influence of electronic configuration on substitution mode and the solubility limit can be successfully explained together with atom radius.
关键词:
alloying behaviour
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null
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null
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null
DENG Wen XIONG Liangyue LONG Qiwei International Centre for Materials Physics
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaWANG Shuhe GUO Jianting Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The behuviour of B atoms added to mono-and poly-crystalline Ni_3AI alloys has been investi- gated hy positron annihilation technique(PA T).If the additive of B was less than 1.37 at-%, some of B atoms solid-solutioned interstitially into matrix and distorted the lattice,thus the lifetime (τ) of positron (e~+) Or matrix dilated:the others of them segregated on vacancy-like defects and formed "filling effect",thus the mean lifetime (τ)and S parameters decreased.If B added was increased up to 2.22 at-%,more defects having larger free volume were induced by horide eutectic occurred along grain boundaries and grain interior,thus the τ in vacancy-like defects.τ and S parameters increased remarkably.
关键词:
Ni_3Al
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null
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null
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null
