Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      28 November 1989, Volume 5 Issue 6 Previous Issue    Next Issue
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    Articles
    Discovery and Research of High Tc Superconductor in the Institute of Physics, Academia Sinica
    CHEN Liquan A special member of CCAST (World Laboratory), Post Address: Institute of Physics, Academia Sinica, P.O. Box. 603. Beijing, China.
    J. Mater. Sci. Technol., 1989, 5 (6): 391-400. 
    Abstract   HTML   PDF (1149KB)
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    A Structural Study of High Cr Cast Iron as a Grinding Ball Material
    FAN Xinhui;HE Lin;ZHOU Qingde Mechanical Engineering Department Xi'an Jiaotong University., Xi'an. China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 401-406. 
    Abstract   HTML   PDF (1367KB)
    In present paper, the 3-body abrasion and impact fatigue resistance of a 12%Cr-2.65%C-1.4%Si high Cr cast iron are comprehensively evaluated. The results indicated that the lower the C content of the martensitic matrix, the better the impact fatigue resistance of the iron. The retained austenite is always harmful to both 3-body abrasion and impact fatigue resistances. The low C content martensitic matrix free from retained austenite is suitable for making grinding balls.
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    A Statistical Model of Quantitative Relationship between Striation Spacings and Fatigue Crack Growth Rates
    YANG Jingjun;KE Wei Institute of Corrosion and Protection of Metals, Academia Sinica, Shenyang, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 407-411. 
    Abstract   HTML   PDF (1002KB)
    Fatigue crack growth experiments were per- formed on A1 alloy LD 10 and Ti-6A1-4V alloy. Fatigue striation spacings and the deviation angles between the direction of micro-crack growth and that of macro-crack growth were quanti- tatively measured on fracture surface using scanning electron microscope. A statistical model of the relationship between striation spacings and fatigue crack propagation rates was developed on the basis of a statistical analysis of the deviation angles, Good agreement between experimental results and theoretical results calculated with the present model was obtained.
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    The Calculation of Thermodynamic Properties of Ga-Sb Binary Liquid Alloys
    LI Ruiqing General Research Institute for Non-ferrous Metals, Beijing, China.
    J. Mater. Sci. Technol., 1989, 5 (6): 412-414. 
    Abstract   HTML   PDF (289KB)
    In this paper, the activities of components of Ga-Sb system have been calculated from its phase diagram by using computer program CABPD (calculating activities from binary phase diagrams) presented by us in previous paper. The excess free energy of liquid solution can be expressed as: ΔG_m=X_(Ga)X_(Sb)(4392+17022X_(Sb)-15138X_(Sb)) J/mol In order to verify the reliability of calculated results, a discriminant has been proposed.
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    The Study of Dual-phase Steel after Cyclic Deformation at Various Strain Amplitudes
    SUN Zhengming;WANG Zhongguang;AI Suhua Institute of Metal Research, Academia Sinica, Shenyang, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 415-420. 
    Abstract   HTML   PDF (2582KB)
    Low cycle fatigue tests under plastic strain control were carried out with a dual-phase steel containing 23 Vol.-% martensite. Specimens hardened rapidly at first few cycles followed by a slight softening to saturation stages when cycled at higher strain amplitudes, whereas at lower strain amplitudes the specimens presented continually hardening for a long time until saturation. TEM examination of the saturation dislocation structures show that clusters, parallel walls and cells were found at low, medium and high strain amplitude, respectively. It also has been found that the martensite/ferrite interfaces did not affect the dislocation structures signi- ficantly when a specimen was fatigued at lower strain amplitude. However, the dislocation struc- ture adjacent to the two-phase boundary is dif- ferent to some extent from that in the remote regions in the ferrite when a higher strain amplitude is applied.
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    Creep Deformation and Rupture in Smooth and Notched Specimens in HK40 Steel
    ZHU Shijie;ZHAO Jie;WANG Fugang;CAO Zhiben Dalian University of Technology, Liaoning, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 421-425. 
    Abstract   HTML   PDF (1011KB)
    The effects of the eutectic carbides rand secondary carbides on creep deformation and rupture in smooth bars and CT specimens have been studied. The results show that the resistance of the eutectic carbides of skeleton shape to crack growth is larger than that of the blocky shape carbides. The dendritic segregation of secondary carbides promotes the creep ductility. As the secondary carbide particles become coarser, the creep ductility increases and the crack growth rate decreases. However, if the size of secondary carbide is too large, the creep strength decreases too much and therefore crack growth rate increases.
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    Computerized Simulation on the Structure of Cryolite-Alumina Melts
    XIE Gang;QIU Zhuxian;XU Chi;CHEN Nainyi Northeast University of Technology, Shenyang, China. Shanghai Institute of Metallurgy, Academia Sinica, Shanghai, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 426-429. 
    Abstract   HTML   PDF (335KB)
    Monte Carlo calculations were performed on liquid ionic solution of saturated alumina in cryolite melt containing a total of 205 ions. The local structure and radial distribution functions of the melt were computerized by Monte Carlo method at 1283 K. It has been found that there exist the complex ionic clusters such as AlOF_3~(2-), AlOF_4~(3-), AlF_4~-, AlF_5~(2-), AlOF_2~- etc., as well as oxygen-bridge and flourine-bridge ionic clusters. In the melt studied, Al~(3+) ions tend to have preferential even coordination number of 4F~- ions.
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    Fracture Analysis of Composites in High-speed Tension
    JIANG Chiping;CAO Li;ZOU Zhenzhu;WANG Duo;YAO Zhongkai Harbin Institute of Technology, Harbin, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 430-433. 
    Abstract   HTML   PDF (844KB)
    In this paper the results of a high-speed tension experiment of the SiC_w/Al composite have been reported and a simplified theoretical model has been developed to study the fracture mechanism of composites in high-speed tension. This theoretical model provides a new explanation for the increase of dynamic fracture strength of composites in high-speed tension.
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    The Mssbauer Effect of Y-Ba-Cu-Fe-O Superconductive Oxide
    XIA Sike;MA Ruzhang;CAO Guohui;LI Zhengwen;FENG Yongrong University of Science and Technology, Beijing, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 434-436. 
    Abstract   HTML   PDF (284KB)
    We have studied the Mossbauer effect of YBa_2Cu_(2.88)Fe_(0.12)O_(7-x) superconductive oxide from 78 to 273K. Two minima of recoilless fraction and Debye temperature were found near 110K and 220K. It means that lattice softening happened near these two temperatures. We also observed minima of isomer shift near 110K and quadrupole splitting increase when temperature is lower than 110K. We suggest that lattice softening would lead to the displacement of oxygen atoms. This may be relative to superconductive transition.
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    Effect of Rare-earth Element La on Co-base Superalloy
    WANG Shuhe;DAI Tongfu;SHI Changxu
    J. Mater. Sci. Technol., 1989, 5 (6): 437-441. 
    Abstract   HTML   PDF (970KB)
    The effect of La element on the mechanical properties and constitution nearby grain boundary in a Co-base superalloy Co-22Ni-22Cr-14k during 760℃ ageing has been investigated by AES and material testing. Results show that element La can be in a state of solid solution and segregates mainly at the vicinity of grain boundaries. The prior segregation of La atoms can affect segregation behaviour of other elements, so that exerts influence on microstructure of the alloy, Particularly increasing of La content can decrease P concentration at the vicinity of grain boundaries but not decrease S concentration. S together with La produce cosegregation effect. The content of La has no obvious effect on high temperature strength. When the content of La comes up to 0.02wt-%, it can obviously improve the high temperature ductility.
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    Microstructure and Coercivity in High H_c Sm(Co, Cu, Fe, Zr)_(7.4) and Nd-Fe-B Alloys
    PAN Shuming;XIAO Yaofu General Research Institute of Nonferrous Metals, CNNC. Beijing, China. University of Science and Technology Beijing, China. To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1989, 5 (6): 442-445. 
    Abstract   HTML   PDF (1411KB)
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    Properties of Fe-20Cr-4Al-Y Alloys
    LI Bei;MENG Guang'en;WU Shuangxia;YU Hongxiang;JIN Shisheng;YANG Baomin
    J. Mater. Sci. Technol., 1989, 5 (6): 446-450. 
    Abstract   HTML   PDF (738KB)
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    University of Science and Technology Beijing
    JIA Shizhen University of Science and Technology Beijing, China.
    J. Mater. Sci. Technol., 1989, 5 (6): 451-454. 
    Abstract   HTML   PDF (691KB)
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    metals news
    No Author
    J. Mater. Sci. Technol., 1989, 5 (6): 455-458. 
    Abstract   HTML   PDF (429KB)
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    Abstracts of Selected Articles on Metals Published in China
    No Author
    J. Mater. Sci. Technol., 1989, 5 (6): 459-468. 
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CN: 21-1315/TG
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