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ISSN 1005-0302
CN 21-1315/TG
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      28 July 1996, Volume 12 Issue 4 Previous Issue    Next Issue
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    Articles
    Design of Hybrid Composites with Zero Coefficient of Thermal Expansion
    Zuoguang ZHANG; Weihong ZHONG and Huancheng SONG(Dept. of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 241-248. 
    Abstract   HTML   PDF (621KB)
    Structures used in aerospace are influenced by temperature. So coefficient of thermal expansion (CTE) is not only an important parameter of materials, but also a significant parameter of structural design of spacecrafts with high dimensional stability. In this paper, based on the analysis of the data from tests, theoretical formulae for predicting CTE and mechanical properties of hybrid composites are presented, and the calculation program is compiled. All the equations are verified by experiments. Optimization is conducted by computer. The results and methods presented in this paper can be used both in optimal design of hybrid composites with zero CTE and in design of hybrid composites with any certain CTE value
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    STM Study on the Surface Relief and Mechanism of Bainite Transformation
    Zhigang YANG; Hongsheng FANG; Jiajun WANG; Yankang ZHENG and Chunming LI(Dept. of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 249-254. 
    Abstract   HTML   PDF (3768KB)
    Scanning tunneling microscopy (STM ) has been first employed to study the surface relief accompanying bainite transformation in a Fe-2.17C-12.18Cr-0.31Si-0.26Mn (wt pct) steel. With the exclusive vertical resolution of STM, we observed that the surface relief associated with bainite is a group of surface reliefs related to subplates, subunits and sub-subunits. As a whole, the relief group is in a tent shape, not of invariant plane strain (IPS) type, which is obviously different from that of martensite, and implying that bainite is not formed by shear mechanism. The fine structure of bainite in Fe-1.0C-4Cr-2.0Si (wt pct) alloy has also been studied with STM and TEM. It is found that the bainite plate is composed of subplates, subunits and sub-subunits. On the basis of the fine structure inside a bainitic ferrite plate observed under STM, a sympathetic-ledgewise mechanism of bainite formation is proposed
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    Tetragonal Domain Switching via Reversible t■m Phase Transformation
    Haiyan ZHU and Zhicheng XU(Dept. of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 255-260. 
    Abstract   HTML   PDF (558KB)
    Grinding-induced tm phase transformation and the resultant texture in ceria-yttria-doped tetragonal zirconia polycrystals with varied tetragonality have been studied by XRD. It is observed that the reversible tm phase transformation occurs during grinding and the intensity ratio of I(002)t/I(200)t increases with the transformability. The author proposes that the texture induced by grinding at low temperatures is due to the tetragonal variant reorientation via cyclic,reversible tm phase transformation, termed "transformational domain switching", instead of the ferroelastic one
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    Composition Dependence and Irradation Effects on Residual Resistivity in Cu-Al Alloys
    M. Sadiq and Nazma Ikram(Centre for Solid State Physics, University of the Punjab, New Campus, Lahore-54590, Pakistan)A. Shaukat(Physics Dept., University of the Punjab, New Campus, Lahore-54590, Pakistan)Farid A. Khwaja(Dept. of Physics, Quaid-e-Azam Uni
    J. Mater. Sci. Technol., 1996, 12 (4): 261-266. 
    Abstract   HTML   PDF (638KB)
    Residual electrical resistivity due to short-range order has been calculated for Cu100-xAlx (x=9.13,13.56, 14.5 and 14.76 in at pct) alloys using pseudopotential approach, and the results have been discussed in the light of experimental studies of the local-order structure of these alloys. In case of Cu85.5Al14.5, change in the total residual electrical resistivity due to neutron-irradiation effects has been estimated by including contributions from the short-range order and static atomic displacement correction. Our results show a decrease in the residual resistivity in the irradiated Cu-Al solid solution as compared to the unirradiated sample. This is in accordance with the experimental results
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    Efficiency of Chalcone Compounds Inhibitors for Acid Corrosion of Al and Al-3.5Mg Alloy
    I. Z. Selim; A. A. Khedr and K.M.EI-Sobki(Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)
    J. Mater. Sci. Technol., 1996, 12 (4): 267-272. 
    Abstract   HTML   PDF (480KB)
    Corrosion inhibition of Al and Al-3.5Mg alloy by organic compounds, namely chalcones in hydrochloric acid solutions has been investigated by rapid polarization technique and weight loss method. Polarization measurements show that, the inhibitors act cathodically both in case of Al and Al-3.5Mg alloy. It was found from the weight loss measurements that, the inhibition efficiency depends on the substituent in the chalcone compound. The relative inhibitive efficiency of these compounds has been explained on the basis of structure dependent electron donor properties of the inhibitors and the metal inhibitor interaction on the surface. The inhibition efficiency ranges from 16 to 64% for Al and from 30% to 91% for Al-3.5Mg alloy
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    A Special Structure in Al-Mg-Li Alloy (01420) Weld Metal
    Xiaohu YING; Zhaoqing WANG; Huiyun YING(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)Ping CHEN and Yanjie GUO(Northeastern University, Shenyang 110006, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 273-276. 
    Abstract   HTML   PDF (2311KB)
    A large quantity of laminated fine grain zones were observed in the Al-Mg-Li alloy weld metal by manual TIG, which was not found in ordinary Al alloy welds. The fine grain zone is formed because of the Al3(Zr,Ti) particles in the filler metal and the manual filling of filler metal in welding process
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    Investigation on the Recrystallization Behaviour of Cold Deformed MP159 Alloy
    Guangwei HAN; Di FENG; Ming YIN; Wujun YE and Heli LUO(Dept. of Superalloys, Central Iron and Steel Research Institute, Beijing 100081, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 277-280. 
    Abstract   HTML   PDF (2169KB)
    The recrystallization behaviour of cold drawn MP159 alloy was investigated by optical and TEM examinations. It is found that the platelet ε phase in the MP alloy inhibits the recrystallization,and this effect makes the MP159 alloy with high recrystallization temperature of about 920℃.This inhibition mainly comes from the increasing of the interfacial energy, which results from the change of the coherent interfaces of (0001)hcp//(111)fcc into the incoherent interfaces when the recrystallizing grain fronts bypass the platelet ε martensite. The increasing of the interfacial energy also causes the dissolution of a few segments on the ε martensite platelets, which decreases the strength of the MP alloy
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    A Simplified Regular Solution Model for Solubility of Nonmetal (2) in Metal(1)-Metal(3) Alloy Systems
    Zheng FANG(Dept. of Chemistry, Central South University of Technology, Changsha 410083, China)Quanru ZHANG(Dept. of Metallurgy, Changsha Technical College, Changsha 410012, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 281-285. 
    Abstract   HTML   PDF (364KB)
    A simplifled regular solution model for the solubility of nonmetallic element (2) in metal(1)-metal(3) alloy system has been derived and applied to the Fe-C-j, Ni-C-j and Fe-N-j (j denotes a metal) systems with satisfaction. The exchange energies of concerned systems are evaluated
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    Erosion Behaviour of TiNi Alloy Foils under Various Heat Treatments
    Yanan LIANG; Zhechang WANG; Shizhuo LI ang Zhongyao SI(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 286-290. 
    Abstract   HTML   PDF (1975KB)
    The erosion behaviour of TiNi alloy foils (Ni: 50.5 at pct, thickness: 70~90μm) under various heat treatments has been studied with two different tests: sand-blasting erosion (SBE) with impingement angle of 30°and slurry erosion (SE). The erosion resistance of the foils aged at 400~450℃/30 min is the best in all tests. The quenched foil is also good in the SBE test, but not so good in the SE test. The slurry-erosion resistance of the aged foils is better than that of L214 with high hardness. All the foils exhibit much better erosion resistance than 18Cr-8Ni stainless steel in the tests
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    Transient Current Behaviour for Iron in 3.5%NaCl and 3.5%NaCl+ 1%NaNO_2 Solutions during Corrosion Fatigue
    Zhengfu WANG; Xuejun WEI; Jin LI and Wei KE(State Key Lab. for Corrosion and Protection, Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 291-298. 
    Abstract   HTML   PDF (785KB)
    The transient current behaviour for Iron in 3.5%NaCl and 3.5%NaCl +1%NaNO2 solutions during corrosion fatigue (CF) process has been investigated at different given strain amplitudes and strain rates. The results show that elastic strain has little contribution to material dissolution. The elastic tension strain results in the decrease in the transient current, while the elastic compression strain increases the transient current. Compared to the elastic deformation, plastic deformation affects material dissolution evidently For iron in 3.5%NaCl solution, the strain amplitude plays a dominant role in the dissolution process accelerated by the plastic strain, while in 3.5%NaCl+1%NaNO2 solution, both the strain amplitude and strain rate play an important role in this process. In this paper, the effect of the elastic deformation on the material dissolution and the relation between the tension and compression current peak values under the plastic cycle deformation are discussed
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    Packing Densities and Glass Forming Ability of Alloys
    Qing JIANG; Xiaoya XU; Hongjun NIU and Xiaoxia LU(Dept. of Materials Science and Engineering, Jilin University of Technology, Changchun 130025, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 299-302. 
    Abstract   HTML   PDF (418KB)
    The random closed packing fraction of hard balls of three different sizes were measured by use of the Archimedes method. This packing fraction increases as the kind of balls with different sizes increases. The packing fraction is related to the mixing entropy of an ideal solution in respect to the holes among the hard balls. The composition zone of La-Al-Ni amorphous alloy made by cooling the alloy melt with a cooling rate of 90 Ks-1 is located at same zone of the largest values of packing fraction and mixing entropy of hard balls in the ternary system. where the proportion of atom sizes of La, Al and Ni is similar to that of hard balls. The packing fraction and the mixing entropy are qualitatively considered as one of the criteria of the glass forming ability of alloys
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    Preparation of Sodium Borosilicate Transparent Bulk Gel
    Weidong XIANG; Zhongcai WANG; Quanzhu YANG and Wenxing ZHAO(Changchun Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Changchun 130022, China)Chengyu WANG(Institute of Glass and Inorganic Materials, Dalian Institute of Light Industry
    J. Mater. Sci. Technol., 1996, 12 (4): 303-306. 
    Abstract   HTML   PDF (383KB)
    A transparent bulk sodium borosilicate gel with the composition of 72SiO2·23B2O3·5Na2O (wt pct) was prepared by using tetraethyl orthosilicate, boric acid, sodium methoxide, sodium alkoxide, sodium acetate as precursor, methanol, ethanol and glycolic methyl ether as precursor solvent and hydrochloric acid as catalyst. Properties of gel, varied principle and related mechanism of conversion for sol to gel are discussed. Ideal composition and dry process are given in this work
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    Influence of Microwave Radiation on Properties and Structureof Fe_2O_3/SO_4~(2-) Solid Superacid Catalyst
    Yinan NING (Kunming Institute of Precious Metals, Kunming 650221, China)Jiaqiang WANG and Pinjie HONG(Yunnan University, Kunming 650091, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 307-311. 
    Abstract   HTML   PDF (536KB)
    The microwave radiation method was introduced to prepare the Fe_2O_3/SO solid superacid.Its structure and properties were investigated by means of X-ray diffraction and infrared spectrum analyses as well as measurement of magnetic susceptibility and rate of esterification. The structure of the superacids prepared in microwave field can be crystalline or non-crystalline, the latter has not been reported yet in literatures. Comparing with the traditional superacid, the non-crystalline Fe2O3/SO superacid prepared in microwave field has the highest magnetic susceptibility and catalytic activity. The di-coordination of Fe2O3 and SO and the S=O bi-bond were reinforced by microwave radiation, which is favorable for increasing the acid intensity of the Fe2O3/SO catalyst
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    Characterization of C-N Thin Films Prepared by Ion Beam Sputtering
    Yongjun TIAN; Xuejun REN; Dongli YU; Julong HE; Shizhen CHEN and Dongchun LI(Dept. of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China)Richeng YU, Ming ZHANG and Winkui WANG(Institute of Physics, Chinese Academy of Sciences
    J. Mater. Sci. Technol., 1996, 12 (4): 312-314. 
    Abstract   HTML   PDF (284KB)
    C-N thin films have been prepared by ion beam sputtering using pure N2 as discharge gas. The ratio N/C of the films measured by Auger spectrum is 20% on an average. The results of X-ray diffraction and transmission electron microscopy show that β-C3N4 phase exists in the films. Xray photoelectron spectroscopy shows that nitrogen is mostly combined with carbon with triple (C=N) and double (C=N) bonds. The IR absorption shows an absorption bond near 2185 cm-1assigned to the C=N, no trace of C-C bond was observed
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    Kinetic Process and Conductivity of Ag~+ Ion Exchange for Polycrystalline Na-β"-Al_2O_3
    Jianhua YANG(Shanghai Institute of Ceramics, Chinese Academy of Scieoces, Shanghai 200050, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 315-317. 
    Abstract   HTML   PDF (239KB)
    This paper reports the kinetic process of Ag ion exchange for the polycrystalline Na-β"-Al2O3.The interdiffusion coefficients in the process of Ag+ and Na+ ion exchange have been calculated with an "one dimensional double side diffusion model". Microstructures of the samples were observed and analysed by XRD, EMPA, SEM. The results of the conductivity measurements for samples with Na+, Ag+ and Na+-Ag+ mobile ions are presented and explained
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    Multirange Fractal Analysis on the Negative Correlation between Fractal Dimension of Fractured Surface and Toughness of Materials
    Chiwei LUNG; Jian JIANG and Chenghua ZHANG(International Centre for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (4): 318-320. 
    Abstract   HTML   PDF (256KB)
    Applying the concept of multirange fractals, a new explanation to the Williford's multifractal curve on the relationship of fractal dimension with fracture properties in materials has been given. It 5hows the importance of factorizing out the effect of fractal structure from other physical causes and separating the appropriate range of scale from multirange fractals
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ISSN: 1005-0302
CN: 21-1315/TG
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