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| 1 | Characterization and Growth Morphology of the Ultrafine Manganese Particles显示文摘In present work.the ultrafine manganese particles were prepared by gas evaporation method.Thestructure,size distribution,growth morphology and surface oxidation for the particles were investi-gated by using X-ray diffraction and electron microscopy.The results indicated that three types ofthe particles,with the structure of α-Mn,β-Mn and one unknown,respectively existed in the man-ganese particles.The growth morphology of the particles depended on the size and intrinsicstructure.When exposed to air,the particles were slightly oxidized only in the surface layer and sta-ble in air. | Jian XU Xiukui SUN Wenxiu CHEN Wenduo WEI State Key Laboratory of RSA,Institute of Metal Research,Academia Sinica,Shenyang 110015,China | 1993 | Journal of Materials Science & Technology1993，9，3： | 0 |
| 2 | Synthesis of Aluminum Nitride Nanocrystalline显示文摘Nanocrystalline aluminum nitride (whisker and particle) has been synthesized by heating the mixed aluminum+aluminum nitride ultrafine powders (UFPs) produced by nitrogen plasmamolten aluminum reaction, under N2 atmosphere at lower temperature. Some bamboo-like nano- whiskers of aluminum nitride were observed in TEM, the possible formation mechanism of the whiskers was also disucssed. | Sun, Xiangcheng Sun, Xiukui Wei, Wenduo
| 1998 | Journal of Materials Science & Technology1998，14，5： | 0 |
| 3 | STRUCTURE AND SURFACE CONDITION OF ULTRAFINE AI PARTICLES显示文摘The crystal habit,crystalline structure,surface condition and composition of the ultrafine Alparticles prepared by inert gas evaporation method were studied in detail by means of highresolution transmission electron microscope,X-ray diffraction and X-ray photo-electronspectrum.The results indicate that the ultrafine Al particles prepared in high pure inert gasare of clear crystal habits,single crystal in a large majority and fcc crystalline structure witha0=0.405 nm.It is also found on the surface of the Al particles that there is a layer of amor-phous Al2O3 with 2 nm average thickness,which could protect the particles against oxidizingfurther.Therefore,the ultrafine Al particles prepared by the inert gas evaporation method arevery stable in atmosphere. | 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 | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，6： | 0 |
| 4 | Hydrogen Permeation and Diffusion in Low-carbon Steels and 16Mn Steel显示文摘In the present work. the hydrogen permeation and diffusion in two low-carbon steels. # 10 and #20. and 16Mn stee1 over the temperature range of 80 to 330℃ were investigated using gaseous permeation technique. The temperature dependence of hydrogen permeability. diffusivity and solubility for the three steels was obtained in the form of the Arrhenius equations. It was shown that the hydrogen permeability of the 16Mn steel is somewhat lower than that of the two low-carbon steels.whereas the hydrogen diffusivity is lowered in the order of #10, #20 and 16Mn but the activation energy of diffusion is much the same for the three steels. The difference in the diffusivity was attributed to the increase of ferrite-cementite interface areas with the refinement of pearlitic structure in the | Jian XU and Xiukui SUN(State Key Lab. of RSA, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)Xiaozi YUAN and Baoming WEI (To whom correspondence should be addressed)(Dept. of Applied Chemistry, Nanjing Institute of Chemical Technol | 1994 | Journal of Materials Science & Technology1994，10，2： | 0 |
| 5 | HYDROGEN PERMEATION AND DIFFUSION IN ALLOY INCOLOY 903显示文摘Permeability and diffusivity of hydrogen in Fe-Ni-Co based superalloy lncoloy 903 weremeasured over the temperature range of 220 to 420℃ using a gaseous permeation technique.The effect of strengthening phase γ’ precipitated after being aged on the hydrogenpermeation and diffusion was investigated.It was indicated that the permeability anddiffusivity of hydrogen in the alloy hardly depend on heat treatment condition and are not af-fected by γ’ phase precipitated after being aged.The relationships between the permeabilityand diffusivity of hydrogen and the temperature can be respectively expressed asΦ=9.36×10-5exp[-54.20(kJ/mol)/RT]mol/m·s·MPa1/2andD=4.24×10-7exp[-49.07(kJ/mol)/RT]m2/s. | XU Jian SUN Xiukui CHEN Wenxiu LI Yiyi State Key Laboratory of RSA,Institute of Metal Research,Academia Sinica,China research assistant,Institute of Metal Research,Academia Sinica,Shenyang 110015,China | 1993 | Acta Metallurgica Sinica(English Letters)1993，6，3： | 0 |
| 6 | X-ray Diffraction Line Profile Broadening of Fe_(50)Pd_(50) Alloy Ultrafine Particles显示文摘The composition distribution in Fe50Pd50 alloy ultrafine particles prepared by inert gas condensation method was investigated in details by means of X-ray diffraction technique through deconvolution of the X-ray diffraction data. The microscopic composition distribution in the alloy UFP was identified, which is caused by nonuniformity of the melt, fractional distillation during the evaporation process and statistical fluctuation during nucleation and coalescence of the alloy particles. The composition distribution affects the properties of the alloy | Jian CHEN Wenduo WEI Mingchuan YANG Xiukui SUN Wenxiu CHEN and Zhuangqi HU (State Key Lab. of RSA, Institute of Metal Research, Chinese Academy Sciences, Shenyang, 110015, China) | 1995 | Journal of Materials Science & Technology1995，11，6： | 0 |
| 7 | Diffusion of Hydrogen along the Grain Boundaries in Ni_3Al Alloys显示文摘The diffusivity of hydrogen in two Ni3Al alloys (No.1 and No.2) has been measured in the temperature range of 100’C to 420’C using an ultrahigh vacuum gaseous permeation technique. The diffusivity data fall into two segments, in which the hydrogen diffusivity adheres to the Arrhenius form, respectively. From the hydrogen diffusivity, it is conjectured that the hydrogen diffusivity reflects the hydrogen transportation along the grain boundaries at lower temperature and the hydrogen transportation in the lattice at higher temperature. The intergranular fracture of L12-type intermetallics induced by hydrogen at relative low temperature results from hydrogen transportation along the grain boundaries and not in the lattice. | Xiaoying CHENG and Xiaojing WAN Institute of Materials Research, Shanghai University, Shanghai 200072, China Qiuyun WU and Xiukui SUN State Key Lab. for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China | 2001 | Journal of Materials Science & Technology2001，17，2： | 0 |
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