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ISSN 1005-0302
CN 21-1315/TG
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      28 March 1996, Volume 12 Issue 2 Previous Issue    Next Issue
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    Growth of Mixed Rare Earth Tartrate Crystals (Y(1-x)Sm_x)_2(C_4H_4O_6)_3·zH_2O from Silica Gels
    Anima Jain and P.N.Kotru(Dept. of Physics, University of Jammu, Jammu-180 001, India)M.L.Kaul (Dept. of Chemistry , University , University of Jammu, Jammu-180 001, India (To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1996, 12 (2): 81-88. 
    Abstract   HTML   PDF (3944KB)
    Experiments performed on the grwth of mixed crystals of rare earth tartrates (Y1-xSmx)2 (C4H4O6)3.zH2O (0≤x≤1) from silica gels at 35~40℃ and 25~30℃ employing single-diffusion technique. are discussed. The crystals maintain spherulitic morphology, irrespective of the value of x, concentration of upper and lower reactants, gel pH, gel age and gel temperature. Formation Of Liesegang rings in this system is a temperature dependent phenomenon. It is shown that with the increase of the value of x the system passes from Liesegangring phenomenon to singlezone phenomenon. Operative mechanism of crystallization in the higher (35~40℃) and lower temperature ranges (25~30℃) is explained. Seeded growth experiments indicate the possibility of increasing the size of the spherulites in the gel medium
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    Evaporated Thin Films of CdS and CdTe: Optimization for Photovoltaic Applications
    Shahzad Naseem; Dilawaiz Nazir ; Riffat Mumtaz and Khadim Hussain (Centre for Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590, Pakistan (To whom correspondence should be addressed Present address: * Lahore College for Wome
    J. Mater. Sci. Technol., 1996, 12 (2): 89-94. 
    Abstract   HTML   PDF (514KB)
    Thin films of cadmium sulphide and cadmium telluride have been prepared by thermal evaporation under various conditions of deposition. These films have been characterized optically. electrically and for structure determination. The results of these characterizations along with the initial results of all thin film CdS/CdTe solar cells are presented in this paper
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    Improvement of Concrete Properties and Reinforcing Steel Inhibition Using a Natural Product Admixture
    S.H. Tantawi (Building Research Institute, Dokki, Cairo, Egypt)I.Z.Selim (Physical Chemistry Dept., National Research Center, Dokki, Cairo, Egypt (To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1996, 12 (2): 95-99. 
    Abstract   HTML   PDF (515KB)
    The use of a natural white juice, taken from magrabe banana stem, as concrete admixture to improve mechanical and physicrvchemical properties of concrete has been studied. The compressive strength, bulk density the free lime liberated during hydration and the combined water content were determined. The results indicate that the admixture acts as a retarder in most cases and as accelerator in some ones. Also, the admixture effect on the corrosion resistance of the reinforcing steel against surrounding aggressive media has been investigated using galvanostatic polarization technique. The addition of 0.2% admixture leads to the more inhibition of the steel
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    Microstructure Evolution of Rapidly Solidified Ti_3Al-2Nb Alloy
    Rui XU; Yuyou CUI; Dong LI and Zhuangqi HU (State Key Lab. of RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)Daming XU and Qingchun LI (Dept. of Materials Science and Technology, Harbin Institute of Technology, Harb
    J. Mater. Sci. Technol., 1996, 12 (2): 100-104. 
    Abstract   HTML   PDF (2602KB)
    It has been found from the analysis of X-ray diffraction and the observation of TEM that the metastable ordered orthorhombic martensite phase in the rapidly solidified Ti3Al-2Nb alloy transforms to various phases at different aging temperatures. When the alloy aged at temperature of 500℃ for 20 min, the phase decomposition into B2 and O phases is related to the stressin the alloy. When the aged temperature above 600℃, the phase transforms to α2 phase by both shearing and chemical ordering
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    Effect of Strain Rate on Hydrogen Embrittlement Behaviour of Amorphous NiCrFeSiB Alloy
    Yu ZUO (Beijing University of Chemical Technology, Beijing 100029, China)Ronald M. Latanision (Massachusetts Institute of Technology, MA 02139, USA)(To whom correspondence should be addrossed)
    J. Mater. Sci. Technol., 1996, 12 (2): 105-108. 
    Abstract   HTML   PDF (1202KB)
    The effect of strain rate on hydrogen embrittlement behaviour of amorphous Ni-6.6Cr-2.6Fe-7.8Si-14.5B (at pct) alloy in 0.1 mol/L H2SO4 solution was studied by the methods of slow Strain rate testond electrochemical charging. The results show that fracture Stress of the alloy decreases with the decrease of Strain rate within a certain range. As a tentative explanation, the effect of strain rate on hydrogen embrittlement fracture stress was attributed to the interaction between hydrogen and the excess volume in amorphous alloys
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    Microstructure Variation of Cold Deformed MP159 Alloy during Aging
    Guangwei HAN; Di FENG; Ming YIN and Nanseng YANG(Central Iron and Steel Research Institute, Beijing 100081, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1996, 12 (2): 109-113. 
    Abstract   HTML   PDF (3563KB)
    By comparing the relationship of room temperature yield strength with the reduction of cold rolled MP159 alloy before and after aging at 650℃, and by means of TEM examination on the corresponding microstructures, the occurrence of fcc(α)→hcp(ε) martensitic transition in MP159 alloy during cold deformation and the variation of the platelet E phase during aging have been Studied. The results show that the platelet E phase is really formed when the cold deformation reaches a critical value, and both the amount and the width of the platelet B phase would further increase during 650℃ aging. The increases of the amount and the width of the platelet εphase result in an additional increase of yield strength. Therefore, it is concluded that the additional hardening effect of MP159 alloy after aging is not only from the precipitation of Ni3X disperse phase but also from the volume fraction increase of the platelet ε phase. Further occurrence of the martensitic transition during aging may be due to the elimination of residual compression stress within matrix induced by the fcc(α)→hcp(ε) transition during cold deformation
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    Preparation and Characterization of Multilayered Al/Fe-Mo-Si-B Alloy with Nanostructure
    Bin YAO; Jie GONG; Yizhi GENG ; Chunzong MIN and Zhiming XING (Dept. of Physics, Siping Normal College, Siping 136000, China)Aimin WANG; Bingzhe DING and Zhuangqi HU (National Key Lab. of RSA, Institute of Metal Research, Chinese Academy of Sciences, S
    J. Mater. Sci. Technol., 1996, 12 (2): 114-118. 
    Abstract   HTML   PDF (1825KB)
    The bulk multilayered Al/Fe-Mo-Si-B alloy with nanostructure was prepared by annealing the alternate layers consisting of metal Al and amorphous (Fe0.99,Mo0.01)78 Si9B13 alloy ribbons for 30 min at 873 K under pressure of 3~5.5 GPa. The structures and grain sizes of the Fe-MoSi-B nanocrystalline alloy were measured and analyzed. It was found that the pressure could restrain the growth of the grains and influence the formation of phases. The dependence of grain sizes for α-Fe(Mo,Si) and Fe2B on pressure was given. The morphologies of Al/Fe-Mo-SiB nanocrystalline alloy intedeces were observed by SEM. Two intedecial phases formed at various pressures were established by TEM and EDAX, and an unknown Fe-rich one with nanostructure was also observed. The dependence of the intedecial phases on pressure and its formation and growth mechanism were discussed
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    Phase Relationship in (Dy_(0.65)Tb_(0.25)Pr_(0.1))Fe_x Alloys (1.6≤x≤2.1)
    Bowen WANG;Changheng WU ; Yuzhi CHUANG and Ximei JIN (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)(To whom correspondence should be addressed)(Present address: Shenyang Institute of Technology Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (2): 119-123. 
    Abstract   HTML   PDF (1453KB)
    The microstructure and phase relationship of (Dy0.65Tb0.25Pr0.1)Fex alloys in the composition range of 1.6≤x≤2.1 were investigated using optical microscopy, X-ray diffraction , DTA and EPMA techniques. The variations of microstructure and lattice parameter with the iron content,the effect of heat treatment on the microstructure and the phase relationship have been studied.The phase relationship in the vicinity of the Laves phase is proposed
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    Ductile Phase Toughened Brittle Materials
    Xudong SUN(Dept. of Materials Science and Engineering, Northeastern University, Shenyang 110006, China)J.A. Yeomans(Dept. of Materials Science and Engineering, University of Surrey, Guildford, Surrey GU2 5XH, UK)(To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1996, 12 (2): 124-134. 
    Abstract   HTML   PDF (4443KB)
    Toughening of brittle materials by the inclusion of ductile phases is governed by several important factors which include ceramic-ductile phase interfacial bond strength, physical and chemical compatibility between ceramic and ductile phase, geometry and mechanical properties of ductile phase. The present understanding of the effect of these factors on toughening is reviewed and clarified. Continuous ductile phases (network, fibre or plate) are found to be more efficient for the toughening of brittle materials than discrete ductile particles. However, ductile particle toughened brittle materials have the advantages of material homogeneity isotropy and particularly better high temperature properties. It has been demonstrated that the influence of interfacial bond strength is determined by the geometry of the ductile phase in the composites. For the comparatively continuous ductile phase, such as ductile network, fibre or plate, comparatively weak inteffocial bond strength can promote partial debonding of the brittle matrix-ductile phase intedece during crack propagation and is beneficial for toughening. For discrete particulate ductile phase toughened brittle materials, the small gauge length of the ductile phase often results in the ductile phase pull-out during crack propagation which is the main limitation to toughening.Thus strong bond strength is required to ensure the bridging of the crack by the ductile phase.The coefficient of thermal expansion (CTE) mismatch between matrix and ductile phase has also been correlated with the geometry of the ductile phase. In most of the ceramic/metal systems,the CTE of the ductile metal phase is greater than that of the ceramic matrix. In the case of ductile network, fibre or plate, the residual stress created by the CTE mismatch can contribute to toughening through its influence on the initial crack opening stress while the bridging of the crack by the ductile phase is still ensured. However, for discrete ductile particles, the residual stress created by CTE mismatch is liable to cause cracks to by-pass the spherical particles, limiting the efficient use of the inherent toughness of the ductile phase. Low-modulus ductile inclusions are beneficial for the bridging of cracks by the ductile phase. Softer, more ductile inclusions are more effective for the toughening of brittle materials by particulate ductile phase
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    Effect of Elastic Energy due to Atomic Size Factor on Ordering and Decomposition Behaviour of Binary Solid Solutions
    Xiaobing REN and Xiaotian WANG (College of Materials Science and Engineering, Xi'an Jiaotong University Xi'an 710049, China)K.Shimizu and T.Tadaki (Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihoga-oka, Ibaraki, Osaka, 567, Ja
    J. Mater. Sci. Technol., 1996, 12 (2): 135-142. 
    Abstract   HTML   PDF (940KB)
    A theory recently developed by the present authors is applied to the study of the effect of elastic energy due to atomic size factor on the transformation behaviour of binary solid solutions. lt is found that elastic interaction energy (EIE), which is a part of the total elastic energy plays a key role in both ordering elastic interaction ordering (EIO) and spinodal decomposition. The present study gives a reasonable explanation to the historical dilemmas, "elastic energy paradox" and "atomic size factor paradox . By solving these confusing problems, the coexistence of ordering (EIO) and decomposition, which has been regarded as impossible by conventional theories. can be well understood. The mechanism is as follows: lowering of elastic energy demands EIO, and such an ordering provides a driving force for spinodal decomposition. Therefore, in alloys with large atomic size factor, spinodal decomposition is preceded and induced by ordering. Ordering and spinodal decomposition are thus closely related processes to each other
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    Fractal Nature of Crack Growth under Different Temperature
    Qunsheng CAO (Dept. of Physics, Wuhan Yejin University of Science & Technology, Wuhan 430081, China)
    J. Mater. Sci. Technol., 1996, 12 (2): 143-148. 
    Abstract   HTML   PDF (560KB)
    We have studied numerically a simple crack growth model in a two-dimensional triangular lattice of bonds and nodes which incorporates the sudece of a growing crack bond-breaking probability Pi~ exp{(-Vi+Ei)φ(T)}, where Ei is elastic eneny stored in the i-th bond. Different energy temperature factors φ(T) are employed during crack formation and propagation process with a uniform dilation strain case and a shear case and with periodic boundary condition in the horizontal direction. Our results show that the patterns of the cracks generated are fractal structure and the effective fractal dimensionalities decrease with the increase of the temperature factor φ(T)(the absolute temperature T decreasing). In the paper we also discuss the relation between the effective fractal dimension Deff (the radius Rg Of gyration) and the fractal dimensions D (the radius R of circular), and also give their modification values Ω about two kinds of methods in the lattice model
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    An Alternative Parameterization of Embedded-atom Method for Cu, Ag, Au, Ni, Pd and Pt
    Ran FU and Chiwei LUNG (International Center for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China)Qingfang CHEN and Tiefan LI (State Key Lab. of Corrosion Science and Protection, Institute of Corrosion an
    J. Mater. Sci. Technol., 1996, 12 (2): 149-152. 
    Abstract   HTML   PDF (380KB)
    A simple parameterization of embedded atom method is proposed and two adjustable parameters are introduced to describe the pairwise potential and electron density. The embedded energy functions are obtained for fcc metals Cu, Ag, Au, Ni, Pd and Pt through the Standard fitting procedure of embedded atom method. To test the validity of the obtained functions, the formation energy of various defects are calculated
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    Structure and Anomalous Magnetic Properties in Fe-N/Ti-N Nano-multilayers
    Zhenjun WANG; Xiangrong CHANG; Yousong GU ;Zhongzhuo TIAN and Jimei XIAO (Uuiversity of Science and Technology Beijing, Beijing 100083, China)Lishi WEN (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)(To whom corresponden
    J. Mater. Sci. Technol., 1996, 12 (2): 153-155. 
    Abstract   HTML   PDF (756KB)
    DC-magnetron sputtering was employed to prepare Fe-N/Ti-N periodic nano-multilayers . Magnetic properties were studied by vibrating sample magnetometry and structure by TEM and X-ray diffraction for the films. A strong enhancement of the saturation magnetization was found in multilayers containing thinner Fe-N layers. The coercivity was found to be nearly constant. A kind of anomalous hysteresis loops was found in some samples
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    Constrained Crystal Growth Behaviour under Unidirectional Melt Flow
    Shan LIU and Yaohe ZHOU (National Laboratory of Solidification Processing, Northwestern Polytechnical University Xi'an 710072, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1996, 12 (2): 156-158. 
    Abstract   HTML   PDF (1146KB)
    Melt flow has an important influence on the microstructure formation of alloys. In this paper the growth behaviour of constrained crystals is systematically studied. It is discovered that the constrained crystals have a quite complicated response to melt flow. It may grow upstream or downstream or keep its growth direction unchanged with the influence of melt flow. Also low growth velocity and high flow velocity favour the formation of spike-like crystal. A new model is suggested to explain these experimental results
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    Optimization of the Phase Diagram of CeO_2-ZrO_2 System
    Lin LI (Dept. of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)Zuyao XU (T.Y.Hsu)(Dept. of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China)Qing AO (Dept. of Materials Engineering, Shandong Polytech
    J. Mater. Sci. Technol., 1996, 12 (2): 159-160. 
    Abstract   HTML   PDF (209KB)
    Revised phase diagram of the CeO2-ZrO2 system is optimized and the lattice stability parameters of CeO2 of various phases as well as solution parameters of phases (liquid, cubic, tetragonal and monoclinic) are simultaneously obtained by using the Kaufman and Nesor's model for describing the ceramic solutions and the Lukas program
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ISSN: 1005-0302
CN: 21-1315/TG
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