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A Fractal Study on Brittle-Ductile Transition forTi-24Al-11Nb Alloy

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Journal of Materials Science & Technology 1995年第5期11卷 340-344页

作者： CHEN, GL WANG, YD HUANG, YD sun, zq YANG, WY Beijing Univ of Science and Technology Beijing China

The mechanical behaviours of Ti-24Al-11Nb alloy in the brittle-ductile transition (BOT) have been investigated by using three-point bending tests. The temperature dependence of the fractal dimensions and fractal characterization of fracture surfaces are presented. The probable mechanism controlling BDT of intermetallic alloys are proposed according to fractal ***. it is found that there is a positive relationship between the fractal dimension and fracture toughness in BDT for Ti-24Al-11Nb

关键词： Al Ti A Fractal Study on Brittle-Ductile Transition forTi-24Al-11Nb Alloy OO

PHASE TRANSFORMATION OF Al-Ti COATINGS ON Co-BASE SUPERALLOY DZ40M DURING HIGH TEMPERATURE OXIDATION

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中国有色金属学会会刊：英文版 1998年第4期8卷 51-56页

作者： Liu, PS sun, XF Jin, T Guan, HR Hu, zq Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China

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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒｅｉｓａｓｅｒｉｏｕｓｐｒｏｂｌｅｍｏｆｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｏｘｉｄａｔｉｏｎｏｎｔｕｒｂｉｎｅｃｏｍｐｏｎｅｎｔｓ，ｈｅｎｃｅ，ｖａｒｉｏｕｓｃｏａｔｉｎｇｓｗｉｔｈａｌｕｍｉｎｉｄｅａｒｅｍａｎｕｆａｃ...

关键词： Co base superalloy coating phase transformation

Relationship of Initiator Length with Fractal Dimension of Fractured Surfaces of High Strength Steels

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Journal of Materials Science & Technology 1996年第6期12卷 479-480页

作者： Lung, CW Mu, zq International Centre for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Length-yardstick relation was used for measurement of the fractal dimension and the length of the initiator of Koch curves. It was found that the higher the fractal dimension and then the fracture toughness, the short... 详细信息

关键词： Steel

Comparative Study of Bond Orientational Order and Pair Analysisin Describing Local Symmetry in Liquid Metals

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Journal of Materials Science & Technology 1995年第5期11卷 363-368页

作者： CHEN, KY LIU, HB HU, zq Inst of Metal Research Chinese Acad of Sciences Shenyang China

The similarity and difference between the bond orientational order and pair analysis methods have been first identified with the help of molecular dynamics simulation and the steepest descent minimization of potentials techniques. The binary liquid K-Rb alloys are chosen as an example. Results show that the bond orientational order parameters may be a relevant direct measurement on the perfection of an icosahedron. The PA formula (1551 bonded pairs) is, however, responsible for the total number of various icosahedra. In addition, it is found that pair analysis approach is more sensible to local structure than that for bond orientational order.

关键词： Liquid metals

A New Route to S-(-)Zearalenone

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Chinese Chemical Letters 1997年第7期8卷 591-594页

作者： Wang, zq Tian, SK CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

A concise synthesis of naturally occurring S-(-)-zearalenone has been described.

关键词： THF A New Route to S Zearalenone

Substitution Behavior of Elements in CoZr-with Consideration of Lattice Relaxation

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Journal of Materials Science & Technology 1999年第4期15卷 366-368页

作者： Xu, DS Li, D Hu, zq Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China

The substitution behavior of some alloying elements in CoZr is investigated using the discrete variational X alpha cluster method. The method proposed by the author to predict the substitution behavior is amended to consider the local lattice relaxation. A diagram is drawn based on the binding energies of clusters with alloying elements taking either Co or Zr site. Two straight lines on the diagram separate the alloying elements into three groups with different substitution behavior. The elements above the upper line will take Zr sites and those below the lower line will take Co sites regardless of the composition. The substitution behavior of elements in between the two lines will be affected by the alloy composition. The concept of site competition and step ordering is proposed.

关键词： Intermetallics

Annealing Embrittlement in Fe-Mo-Si-B Amorphous Alloy

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Journal of Materials Science & Technology 1997年第1期13卷 61-64页

作者： Li, JM Quan, MX Hu, zq National Key Lab. of RSA Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Annealing at T-a=200 degrees C or so, the enhancement in the average tensile fracture strength of as-quenched (Fe0.99Mo0.01)(78)Si9B13 metallic glass increases about 7 similar to 8%. The origin of the annealing embrittlement at 244 degrees C in the metallic glass (Fe0.99Mo0.01)(78)Si9B13 was revealed that due to the formation of nanoscale granular with bcc structure resulting in the stress localization. The temperature of annealing embrittlement was in agreement with the calculated value from T-bcc=0.637 T-c (T-c is the crystallized temperature), based on micromechanism of crystallization of metallic glass.

关键词： Metallic glass

Structure in Binary Liquid Li-Mg Alloys

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Journal of Materials Science & Technology 1996年第3期12卷 203-208页

作者： Chen, KY Hu, zq Liu, HB HARBIN INST TECHNOL HARBIN 150001PEOPLES R CHINA

Molecular dynamics simulations combining potentials mapping technique have been performed to investigate the structure of: binary liquid Li-Mg alloys at a constant temperature (924 K). Pair correlation function, bond orientational order and pair analysis approach are adopted to give geometrical descriptions on atom arrangement. The trends of splitting of second-peak in pair correlation function, the orientational order parameters and evolution of various symmetries of bonded pairs, etc., vs composition have been examined. The difference and concordance between the bond-orientational order and pair analysis have been first given out. Based on the distribution of attractive part of potentials, it is concluded that the attractive part would dominate the characterization of structure in liquid metals. In addition, icosahedra, defective icosahedra, Frank-Kasper polyhedra and Bernal hole polyhedra formed in liquid Li-Mg alloys are also counted.

关键词： Li Structure in Binary Liquid Li-Mg Alloys Rev Figure

Chemotherapy of multidrug-resistant human lung cancer combined with an MDR1 ribozyme retroviral vector in an orthotopic model

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Chinese Science Bulletin 1997年第3期42卷 231-234页

作者： Gao, zq Gao, ZP Liu, XF Department of Pathology Beijing Medical University Beijing China

NON-SMALL-CELL lung cancer (NSCLC) accounts for 75%—80% of all lung cancers. Chemotherapy is the basic treatment for the patients with NSCLCs, which are often resistant to drugs because of tumor multidrug resistance, the main cause of lower cure rate. Overexpression of P-glycoprotein (Pgp), the product of multidrug resistance gene (MDR1), is the main mechamsm by which tumor produces multidrug resistance. MDR1 gene is known to induce multidrug resistance. MDR1 antisense RNA could inhibit the expression of MDR1 gene and reverse the multidrug resistance in multidrug-resistant human lung cancer. In clinical studies,

关键词： lung cancer orthotopic model MDR1 ribozyme reversal of drug resistance therapy.