HU Benfu University of Science and Technology Beijing
,
Beijing
,
ChinaTAKAHASHI Heishichiro
,
ITOH Hisatoshi
,
TAKEYAMA Taro Hokkaido University
,
Sapporo
,
060
,
Japan Associate Professor
,
Dept of Materials Science and Engineering
,
University of Science and Technology Beijing
,
Beijing 100083
,
China
金属学报(英文版)
The behavior of void swelling and segregation in Fe-15Cr-xMn alloys and an alloy con- taining small amount of W and V was investigated by electron-irradiation.The compositional analysis in the irradiated regions including grain boundaries was performed.The resultdts show that there are many common features of irradiuation tehavior in the Fe-Cr-Mn and Fe-Cr-Ni systems while there are some significant differences,In the Fe-Cr-Mn alloy sys- tems void swelling was rematrkably suppressed and at the same time the radiation-induced segregation was also retarded,furthermore,the segregation was strongly retarded in an Fe-15Cr-15Mn alloy containing small amount of W and V.The results also show that Ni re- placed by Mn does not in general confer immunity from either swelling or phase instabilities. The phase instability is due to the different diffusion behavior of Ni and Mn in reponse to the operation of the inverse-Kirkendall effecr.Fe segregates to the microstructural sinks in the Fe-Cr-Mn alloys.The segregation of Fe often leads to the formation of ferrite.This fact is beneficial to reducing the swelling rate and segregation on the grain boundaries.
关键词:
electron irradiation
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null
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null
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null
LIU Ping Institute of Aeronautical Material
,
Beijing
,
ChinaXU Changgan Beijing University of Aeronautics and Astronautics
,
Beijing
,
China XU Changgan
,
Associate Professor
,
Group 102
,
Beijing University of Aeronautics and Astronautics
,
37 Xueyuan Road
,
Beijing 100083
,
China
金属学报(英文版)
The electrochemical behaviour,which is presented by means of anodic polarization curves.of the component phases in Ti and Ti alloys in aqueous solutions of fluorhydrie acid,chhnhydric acid and amber acid has been investigated.The results indicate that the electrochemical behaviour of the allloys depends upon the composition and the lattice type.The corrosion of x and x′phase in actire region and that of β phase in passive region are the dominant corrosion behaviour.
关键词:
Ti alloy
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null
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null
WANG Yanbin
,
WANG Anrong
,
CHU Wuyang
,
XIAO Jimei University of Science and Technology Beijing
,
Beijing
,
China associate professor
,
Department of Materials Physics
,
University of Science and Technology Beijing
,
Beijing 100083
,
China
金属学报(英文版)
The formation and aggravation of hydrogen damage in Fe-3 wt-% Si alloy during cathodic charging Were studied by means of Lange transmission X-ray topography.Results showed that hydrogen damage did not form in the specimens charged in 0.5 mol/L H_2S0_4 so- lution without poison,and occurred with addition of 250 mg/L As_2O_3 even at very low charge current density.As charging at a certain current density,the size of the damage may enlarge up to a limit yet no more by prolonged time.The damage size increased with increase of charging current density,but not so apparent at high current density. An external tensile stress could promote the formation of hydrogen damage obviously. It seems that for charging in H_2SO_4 solution containing poison,the drop of hydrogen permeation curve against time prolongation is due to the formation of hydrogen damages.
关键词:
hydrogen embrittlement
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null
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null
J.G WanG
,
L.C Zhang
,
G.L. Chenand HQ. Ye(State Key Laboratory for Advanced Metals and Materials
,
Unborsity of Science and Technology Beijing
,
Beijing 100083
,
China)(Laboratory of Atond Imaging of Solids
,
Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)
金属学报(英文版)
The dislocation ledges at the α2/7 intedece in a hot-dejormed Ti-45Al-10N alloywere analyzed by high-resolution tmnsmission electron microscopy. A new type ofdislocation ledge containing 1/3[111] Frank partial was found. The height of the ledgestDas always three [111]γplanes. The Burpers vectore of these diBlocation ledges weredetermined to be 1/2[110] and 1/2<101] corresponding to the 90 dey. and 30 deg.Shockley partials at noral ledges, i.e. 90 dep. ShockIey Partial dislocation +1/3[111]Frank partial dislocation; and 30 deg. Shockley partial dislocation + 1/3[111] Frankparfial dislocations. The jormation mechanism of this new tare of dislocation ledgewas discussed.
关键词:
titanium aluminide
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null
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null
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null
J. G. Wang
,
L.C Zhang
,
G.L. Chen and H. Q. Ye(State Key Laboratory for Advanced Metals and Materials
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)(Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China)
金属学报(英文版)
High-resolution transmission electron microscope (HRTEM) was employed to investigate the deformation-induced α2→γ phase transformation phenomenon in a hot deformed Ti-45Al-10Nb alloy. Such a tronsformation can be nucleated either at α2/γ interfaces or at stacking faults on the basal planes of the α2 phase. The growth of deformation-induced γplate is accomplished by the motion of α/6<100> Shockley partials on alternate basal planes (0001)α2, and the α/6<100> Shockley partials move in coordination rather than sweep on (0001)α2 plane one by one. It appears that no atom transportation is involved in this stress-induced α2→γ transfromation.
关键词:
intermetallic compound
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null
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null
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null
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null
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null
S. Abubakir
,
Y.S. Wu
,
T.C. Zhang
,
Z. Yang and Z. Zhang (Department of Surface Science & Corrosion Engineering
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)(Department of Materials Science and Engineering
,
Northeastern University
,
Shenyang 110006
,
China)
金属学报(英文版)
Samples of FJ316 stainless steel powder alloyed with different amounts of glass2 material have been compacted at the pressure of 686MPa and sintered at 1160, 1180,and 1200℃, in hydrogen atmosphere for one hour. The materials have been subjected to microstructure characterization, tensile strength, handness, impact toughness and corrosion testing. The effect of the experimental process parameter has been evaluated and the importance of porosity, sintered temperature, glass content and its grain size in determining mechanical and corrosion properties has been confirmed. Glass has a strong effect on the mechanical properties and produces brittleness when added to FJ316SS. Very good corrosion resistance has been achieved by comparing this result with the corosion resistance of sintered pure stainless steel. The results of this study permit optimization in the production of glass alloyed P/M FJ316SS, with respect to mechanical properties and high corrosion resistance.
关键词:
corrosion rate
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null
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null
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null
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null
DENG Yongrui University of Science and Technology Beijing
,
Beijing
,
ChinaG.S.Ansell Colorado School of Mines
,
Golden
,
CO 80401
,
USA) Associate professor
,
Department of Materials Science and Engineering
,
University of Science and Technology Beijing
,
Beijing 100083
,
China.
金属学报(英文版)
The growth of thermoelastic martensite in a Cu-29% Zn-3% Al alloy has been investigated experimentally and theoretically.Metallographie observations showed that the growth oc- cured thermoelastically,i.e.reversibly,in the radial direction as well as in the thickening di- rection.This is not consistent with the theories of Conhen and some others.A model has been suggested to explain the thermoelasticity of the growth.The basic idea is:the elastic strain distribution is highly heterogeneous and the growth is controlled by the local elastic strain en- ergy at the growth frontier area.The calculated results from the model based on Eshelby's theory are consistent with the observations.
关键词:
thermoelasticity
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null
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null
L.C. Zhang
,
G.L. Chen
,
J. G. Wang and H.Q. Ye(State Key Laboratory for Advanced Metals and Materials
,
University of Science and Technology Beijing
,
Beijing 100083
,
China.)(Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)
金属学报(英文版)
The nonequilibrium α2/γ interfacial structures have been studied using the conventional and high-resolution transmission electron microscope. The nonequilibrium γ/γ and α2/γ interfaces are important microstructure features of hot-forged Ti-45Al-8Nb2.5Mn-0.05B alloys. The characteristics of these nonequilibrium interfacial boundaries include the frequent interfacial ledges and the deviation from the conventional orientation relationship {111}γ.
关键词:
α_2/γinterface
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null
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null
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null
DONG Hongbiao JI Yongyi ZHU Jun LU Shuzu ZHONG Xueyou University of Science and Technology
,
Beijing
,
ChinaLI Jianguo Northwestern Polytechnical University
,
Xi'an
,
China DONG Hongbiao
,
lecturer
,
Department of Metallurgy
,
University of Science and Technology Beijing
,
Beijing 100083
,
China
金属学报(英文版)
In situ eutectic Al_(11)La_3/Al composite material with regular arrangement was prepared by zone melt liquid metal cooling directionally solidification under conditions of high temperature gradient G=700K/cm and growth rate R=6.0-20.0μm/s.Superpose diffraction pat- tern of Al_(11)La_3/Al composite shows that the preferred growth direction is[100]Al// [33]Al_(11)La_3,and the habit plane is(002)Al//(116)Al_(11)La_3.A low density(103)twin is ob- served in Al_(11)La_3 and the growth of(103)twin induces to branching to change the interlamellar spacing.
关键词:
eutectic solidification
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null
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null
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null
