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ISSN 1005-0302
CN 21-1315/TG
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      28 September 1996, Volume 12 Issue 5 Previous Issue    Next Issue
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    Articles
    Corrosion of Y, Fe and Fe-15Y in H_2-H_2S Mixture under 10~(-3) Pa S_2 at 600~800℃
    Yan NIU; Weitao WU and Chaoliu ZENG (State Key Lab. for Corrosion and Protection, Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China)F. Gesmundo and F. Viani (Instituto di Chimica, Facolta di Ingegneria, Un
    J. Mater. Sci. Technol., 1996, 12 (5): 321-328. 
    Abstract   HTML   PDF (2962KB)
    The corrosion of an Fe-based alloy containing 15 wt pct Y in H2-H2S mixtures under 10-3 Pa S2 was studied at 600~800℃ in an attempt to find materials with improved sulphidation resistance with respect to pure Fe. The presence of Y has been shown to be beneflcial, but not sufficient to the level expected. In fact, the alloy is able to form at all tested temperatures an external FeS layer, beneath which a zone containing a mixture of the two sulphides is also present. Thus,Fe can still diffuse through this region to form the outer FeS layer with non-negligible rate. The corrosion rate of Fe is considerably reduced by the Y addition. but the alloy corrodes still much more rapidly than Y. The sulphidation kinetics is generally rather irregular for both the pure metals, while the corrosion rate of the alloy decreases with time and tends to become parabolic after an initial period of 12~17 h. The sulphidation behaviour of the alloys is discussed by taking into account the presence of an intermetallic compound Fe17Y2 and the limited solubility of Y in Fe
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    Effect of Sintering Temperature and Zinc Content on Some Properties of Li-Zn Ferrites
    A.M.El-Saird (Inorganic Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)S.B.Hanna(Refractories and Building Materials Dept., National Research Centre, Dokki, Cairo, Egypt)
    J. Mater. Sci. Technol., 1996, 12 (5): 329-334. 
    Abstract   HTML   PDF (1550KB)
    Li-Zn mixed ferrites with composition formula ZnxLi0.5-x/2Fe2.5-x/2O4 (0.2≤x≤0.8) were prepared by the usual ceramic method in 1000~1150℃. The effects of Zn substitution and sintering temperature on the formation, densification, microstructure and a.c. electrical conductivity have been studied. Under the effect of changing the firing temperature and Zn content, high sintered Li-Zn ferrite bodies are achieved. More fine structure bodies having high electrical resistance are obtained at high Zn content
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    Sintering Formation of Low Temperature Phase MnBi and Its Disordering in Mechanical Milling
    Fuxing YIN and Nanju GU (Dept. of Materials Science and Engineering, Hebei Institute of Technology, Tianjin 300130, China)T.Shigematsu and N.Nakanishi (Dept. of Chemistry, Faculty of Science, Konan University, Kobe 658, Japan)
    J. Mater. Sci. Technol., 1996, 12 (5): 335-341. 
    Abstract   HTML   PDF (706KB)
    With X-ray diffraction and DSC analysis, it is found that 4 cycles of sintering at 593 K are necessary for the complete production of the low-temperature phase (LTP) MnBi. The c/a of the fabricated LTP MnBi is 1.4286. Metastable phase MnBip formed in primary sintering stage of LTP MnBi has the similar crystal structure and lattice constant with the quenched high-temperature phase (HTP) Mn1.08Bi. The structural differences between MnBip phase and Mn1.08Bi phase are discussed. The LTP MnBi phase is unstable for strong mechanical milling as Bi appears after milling over 7200 s in the present milling condition. Strains caused by the mechanical attrition are difficult to accumulate in the MnBi crystaIs, and the crystal size of the milled MnBi is only 30 nm before the presence of grains coalescence. The whole milling process can be classified into 3 stages indicated by the structural changes. Based on the structural parameter calculation, the changes of atomic configurations in every stage have been discussed. The existence of Bi equivalent vacancy site is considered to play an important role in the disordering processes of Mn and Bi atoms
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    Structure and Properties of Electroless Ni Deposits
    Yongzhong ZHANG; Kening SUN and Yiyong WU (School of Materials Science & Engineering, Harbin Institute of Technology, Harbin 150001, China)Jinwu ZHANG and Mei YAO (Dept. of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 342-346. 
    Abstract   HTML   PDF (1580KB)
    The changes in structure and the hardness of two electroless deposited Ni-P alloy coatings (with P content of 1.5 and 9.5 wt pct) with heat treatment have been studied by XRD and TEM. The deposits containing 1.5 wt pct P can be represented as an fcc NiP supersaturated solid solution of 5~10 nm microcrystallites. whereas the deposits containing 9.5 wt pct P are amorphous. The heat treatment process induces crystallization of amorphous Ni to Ni phosphides and fcc Ni.Both of the deposits reach maximum hardness after annealing at 400℃ for 1 h. All coated steel specimens are inferior in fatigue strength to uncoated steel specimens mainly due to the poor fatigue resistance of the coating itself
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    Effect of Si, Al and Bi on Structure and Properties of As-welded and Austempered Ductile Iron Weld Metals during Gas Welding
    Daqian SUN; Zhenfeng ZHOU and Haicheng CAO (Dept. of Mater. Sci. Eng., Jilin University of Technology, Changchun 130022, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 347-352. 
    Abstract   HTML   PDF (3964KB)
    Effect of Si, Al and Bi on the microstructure and mechanical properties of as-welded and austempered ductile iron weld metals has been studied with SEM, TEM, X-ray diffraction, image analysing system, tension and other test methods. Results show that increasing weld Si, Al and Bi content favours improving the chilling tendency of as-welded ductile iron weld and mechanical properties of austempered ductile iron weld and the mechanism is also discussed. On this basis the optimum chemical composition of weld is determined. The mechanical properties of weld and welded joint after austempering can match those of austempered ductile iron
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    Mechanical Model on Brittle Crack Initiation and Propagation
    Guangwei HAN; Di FENG; Wujun YE and Heli LUO (Dept. of Superalloy, Central Iron and Steel Research Institute, Beijing 100081, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 353-356. 
    Abstract   HTML   PDF (421KB)
    A mechanical model is presented in this paper to describe the initiating and propagating of brittle cracks. Two criteria have been deduced from the model to determine the effects of such factors as local stress state, surface and grain boundary energies as well as local grain boundary orientation on the initiating and propagating of both intergranular and transgranular brittle cracks. By which the role of adding B in Ni3Al base alloys to improve their ductility,temper and hydrogen embrittlements in steels and other alloys as well as the random feature of brittle crack initiation could be explained
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    Hardness, Wear Resistance and nacture Toughness of Cast Hiduminium/Corundum Particulate Composites
    K.H.W.Seah(Dept. of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260)R.S.Kulkarni and S.C.Sharma (Dept. of Mechanical Engineering, R.V.College of Engineering, Mysore Road, Bangalore-560-059, Karnataka, Ind
    J. Mater. Sci. Technol., 1996, 12 (5): 357-360. 
    Abstract   HTML   PDF (448KB)
    This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from 0% to 7% in a matrix of as-cast and wrought hiduminium alloy affects the hardness. wear resistance and fracture toughness of the composite. The results show that as the corundum content is increased, the hardness and the wear resistance increase remarkably,whereas the fracture toughness drops significantly. It was found that Just a minute amount of corundum is sufficient to cause a fairly large change in these mechanical properties. The hardness of the material is also affected signifIcantly by the aging time. Moreover, if other factors are kept constant, hot extrusion improves both its hardness and its wear resistance. whereas the fracture toughness is decreased
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    Texture Evaluation of α_2 Phase in Ti-25Al-10Nb-3V-1Mo Alloy Sheet
    Weimin MAO; Yongning YU; Hong YANG and Bo SONG (Dept. of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 361-364. 
    Abstract   HTML   PDF (1360KB)
    The texture evaluation of α2 phase in Ti-25Al-10Nb-3V-1Mo sheet during rolling and annealing has been investigated by means of microstructure observation and ODF analysis. From the weak initial {1010} (1210) and {0001}(1210) textures a {1210}(1010) texture and a {0001}(uvtw)fibre texture are formed after cold rolling. The {0001} (1210) texture is also strengthened simultaneously. The activation process of slip systems is discussed concerning formation of the rolling texture. Because of the disappearance of {0001} (nvtw) fibre texture the primary recrystallization process should occur and the {1210}(1010) texture forms during annealing
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    In-situ Formed AIN Particulates and TiN Whiskers Mixture Reinforced Al Composite
    Chunxiang CUI; Renjie WU and Guoding ZHANG (Institute of Composite Materials, Shanghai Jiao Tong University, Shanghai 200030, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 365-368. 
    Abstract   HTML   PDF (1976KB)
    The TiNw-AINp/Al composite has been successfully fabricated by gas-liquid reaction method in an intensive electromagnetic mixing and casting in an appropriate cooling condition. The as-cast samples of the composite exhibit a homogeneous distribution of TiNw and AINp, and the in situ formed TiN whisker has a mean diameter of 0.5 μm and mean aspect ratio of 5.8~7.5, and the diameter of the AIN particulates is less than 5 μm. TEM observation indicates that there exist some submicron and nanometer sized in situ formed TiNw-AINp in α-Al matrix. The formation mechanism of in situ formed TiNw and AINp is also discussed
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    Mechanism on the Effect of Al upon the γ→ε Martensite Transformation in the Fe-Mn Alloys
    Xing TIAN and Yansheng ZHANG (Dept. of Materials Science and Engineering, Dalian Railway Institute, Dalian 116028, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 369-372. 
    Abstract   HTML   PDF (1078KB)
    The structure of the solid solution treated and deformed Fe-25Mn-(0-3.11)Al-0.15C alloys was examined by means of metallograph and X-ray diffraction, which has confirmed that Al restrains the γ→ε transformation in the Fe-Mn alloys. The mechanism on the restraining effect of Al has been discussed on the basis of the efFect of Al upon the stacking fault energy in the Fe-Mn alloys.Aluminium increases thermodynamically the stability of the Fe-Mn austenite and the driving force limit necessitated to be overcome for the γ→ε transformation, because the thermodynamicalcalculation indicates that Al increases the stacking fault energy in the Fe-Mn alloys at 300 K.Al will decrease the number and the size for the ε-martensite nucleus according to the stacking fault mechanism of the ε-martensite nucleation
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    Environmental Effects on the Room Temperature Ductility of a TiAl Based Alloy
    Wenjue CHEN; Xiaojing WAN and Cheng JIN (Institute of Metallurgy and Materials Science, Shanghai University, Shanghai 200072, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 373-376. 
    Abstract   HTML   PDF (2424KB)
    The effects of different environments and strain rates on the room temperature ductility of a TiAl based alloy with the composition Ti-46Al-2Cr-0.2Si-0.1Nd have been investigated in this paper. The results show that the TiAl based alloy is susceptible to environmental embrittlement at room temperature. The tensile ductility of the TiAl based alloy in difFerent test environments decreases in the sequence of oxygen> air>hydrogen>argon saturated with water vapor. The ductility is also sensitive to strain rate. It increases with increasing strain rate when tested in hydrogen gas. Both H2O and H2 cause environmental embrittlement, with the former being a more potent embrittler
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    Positron Study of Origin of Thermoelastic Martensite Stabilization for a Cu-Zn-Al Alloy
    Jingcheng WANG and Zichang SHAO (Shanghai Key Lab. of Metal-Functional Materials, Shanghai Iron and Steel Research Institute, Shanghai 200940, China)Guilin ZHANG, Wanhui ZHENG and Fanghua YU (Shanghai Nuclear Research Institute, Chinese Academy of Science
    J. Mater. Sci. Technol., 1996, 12 (5): 377-380. 
    Abstract   HTML   PDF (429KB)
    A series of Cu-23Zn-10Al (at pct) alloy specimens subjected to different heat-treatment processes have been studied by means of Doppler broadening technique of positron annihilation combined with mechanical test. Results show that the mechanism of quenched-in vacancies, instead of the other suggested ones, plays a dominant role in thermoelastic martensite stabilization of Cubased shape memory alloy. Knowing the character of the movement of quenched-in vacancies and eliminating them as rapidly as possible are the basis for further optimizing heat-treatment process to obtain desired shape memory performance
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    Photoelectrochemical Study of Passive Films on Sensitized Stainless Steel
    Tianbao DU and Shenhao CHEN (Chemistry Dept., Shandong University, Jinan 250100, China)Maizhi YANG and Li CHEN (Chemistry Dept., Peking University, Beijing 100871, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 381-384. 
    Abstract   HTML   PDF (365KB)
    Passive films formed on sensitized stainless steel in sulphuric acid solutions have been studied using photoefectrochemical techniques. The results of the photocurrent measurement indicate that the passive films on sensitized stainless steel are characterised with n-type or p-type semiconductor in different potential regions. The difference in the photoelectrochemical behaviour can be interpreted assuming that the passive film is an iron-chromium oxide solid solution associated with various hydration degrees of the Cr(Ⅲ) oxides at various potentials
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    Microstructure of Pd_(77.5)Au_6Si_(16.5) Alloy Droplet Solidified in a Drop Tube Process
    Liling SUN; Qi WU;Liwei SUN and Wenkui WANG (Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 385-388. 
    Abstract   HTML   PDF (2335KB)
    The microstructure development of Pd77.5Au6Si16.5 alloy droplet solidified in a drop tube process was studied. It was found that two distinct microstructures, i.e. (Pd,Au)3Si primary phase and Pd+(Pd,Au)3Si eutectic can be obtained when the droplet diameter is within the range between 2.3~0.4 mm. The morpologies of the (Pd,Au)3Si developed from dendrite trunk-like with single branching only into dendrite cluster-like with ternary branching with the decrease of the droplet diameter. When the droplet diameter is about 0.25 mm, the primary phase (Pd,Au)3Si almost disappears and the microstructure mainly shows Pd+(Pd,Au)3Si eutectic. The morphology of the eutectic transforms from fiber-like to plate-like with the decrease of the droplet diameter in the range between 2.3-0.25 mm. When the droplet diameter is about 0.19 mm, the microstructure is only the single phase of Pd solid solution
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    Hydrogen Reduction and Microstructural Changes of ISF Sinter
    Yixin HUA (Dept. of Metallurgy, Kunming University of Science and Technology, Kunming 650093, China)F.R.Sale (Manchester Materials Science Centre, University of Manchester and UMIST, Manchester M1 7HS, UK)
    J. Mater. Sci. Technol., 1996, 12 (5): 389-394. 
    Abstract   HTML   PDF (2539KB)
    The reduction rate and microstructural changes of imperial smelting furnace (ISF) sinter have been investigated by means of thermogravimetric analysis, X-ray difFraction (XRD), scanning electron microscope (SEM ), energy dispersive analysis of X-ray (EDAX) and optical microscope.It is demonstrated that the overall reaction rate of the reduction is influenced by temperature and hydrogen partial pressure in H2 /N2 gas mixtures. There are two distinct zones observed in the partially reduced sinter. The reduction of zincite proceeds predominantly in a narrow range between the two zones, while the reduction of tead oxide and silicate takes place throughout the sinter. The differences between zincite and lead oxide or silicate in reducibility are analysed by thermodynamlcs. The phase transformations and microstructural changes occurring during the reduction process are discussed
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    Polysiloxane-grafted Silica as Modifier for Epoxy Moulding Compounds
    Qingpu HOU;Ying HUANG and Yunzhao YU (Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 395-397. 
    Abstract   HTML   PDF (892KB)
    Polysiloxanes were grafted onto silica through functional group reactions. Polysiloxane-grafted silica is effective in lowering internal stress and enhancing crack resistance of the epoxy moulding compounds (EMC). No discrete polysiloxane domains were formed in the EMC, and the bleedingout of polysiloxane can be solved by using the grafted silica as low stress modifier
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    β→α Transformation of γ-Phase in Sintered WC-Co Cemented Carbides
    Shourong LIU (Tianjin Institute of Hard Alloy Tianjin 300222, China)Yi LIU (Shandong University Jinan 250100, China)
    J. Mater. Sci. Technol., 1996, 12 (5): 398-400. 
    Abstract   HTML   PDF (2069KB)
    Varying the morphology and the structure of γ-phase (Co-base Co-W-C solid solution) by means of altering the cooling rate and the preparing method of liquid sintered WC-Co cemented carbides samples, the mechanism of fcc→hcp transformation of γ-phase in WC-Co alloy has been explored. The results show that, the cooling rate is an important affecting factor on fcc→hcp transformation of γ-phase and the fcc→hcp transformation is mainly a diffusive type when cooling WC-Co samples above room temperature
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ISSN: 1005-0302
CN: 21-1315/TG
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