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BEHAVIOR OF Mg AND ITS EFFECT ON MECHANICAL PROPERTIES OF CAST Fe_3Al ALLOYS

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Acta Metallurgica sinica(English Letters) 1993年第6期6卷 353-357页

作者： YIN Weimin GUO Yianting HU Zhuangqi Institute of Metal Research,academia sinica,shenyang,China professor,Institute of Metal Research,academia sinica,shenyang 110015,China Inst of Metal Research Shenyang China

Proper addition of 0.002 wt-% Mg to cast Fe_3Al alloy may obviously improve the room and high temperature tensile *** spectra show that Mg segregates near grain boundaries as very thin *** under TEM reveals that a suitable amount of Mg enhances ability of cooperative internal deformation so that the dislocations will ease the con- tinuous slip deformation through grain *** fracture feature of Fe_3Al alloy is of transgranular cleavage at room temperature and cracks initiate at grain boundaries.

关键词： Fe_3Al intermetallic compound microalloying mechanical property

A Biomimetic Model of Fiber-reinforced Composite Materials

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Journal of Materials Science & Technology 1994年第1期10卷 34-38页

作者： Shihong LI Ronghui ZHANG Shaoyun FU Xin CHEN and Benlian ZHOU(Institute of Metal Research, academia sinica, shenyang, 110015, China)Qiyun ZENG(Institute of Applied Ecology, academia sinica, shenyang, 110015, China) Inst of Metal Research Shengyang China

In thjs paper. bamboo fiber has been. on micro scale. investigated as a helical. multi-layered hollow cylinder, the stiffness featu res of bamboo bast fiber were compared with those of a multifilament yarn in traditional fiber-reinforced composite materials, Moreover. a biomimetic model of the reinforce ment of fiber-reinforced composite materials was proposed by imitating the fine structure of bamboo bast fiber. The results show that the comprehensive stiffness properties of the cornplicated fine struc ture of bamboo fiber is superior over those of traditional fiber-reinforced composites.

关键词： Cl A Biomimetic Model of Fiber-reinforced Composite Materials

EFFECT OF Zr ON DUCTILITY OF CAST Ni_3 Al-BASE ALLOYS

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Acta Metallurgica sinica(English Letters) 1992年第6期5卷 409-413页

作者： ZHENG Zhi WU Weiwen GUO Jianting ZHU Yaoxiao Institute of Metal Research,academia sinica,shenyang,China Institute of Metal Research,academia sinica,shenyang 110015,China Inst of Metal Research Acad Sinica Shenyang China

Many compressive and tensile tests showed that the room temperature ductility of boron-free Ni_3Al alloy may be markedly improved by a moderate addition of *** ductility of the stoichiometric Ni_3Al and even slightly enriched with Al,may be improved fairly between 400 —600℃,which behaves much better if Zr is added together with ***,the high tem- perature ductility of Ni_3Al alloys containing Cr may be significantly increased by Zr which segregates slightly along grain ***,the toughening mechanism of Zr alloying seems to be different from that of B addition.

关键词： Ni_3Al Zr toughening ductility brittleness

EMPIRICAL RELATIONSHIP BETWEEN RECOVERABLE STRAIN ENERGY AND TEMPERATURE FOR TiNi AND TiNiCu ALLOYS

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Acta Metallurgica sinica(English Letters) 1993年第1期6卷 21-25页

作者： LI Yongsen JIN Yongbai YU Ronghai Institute of Metal research,academia sinica,shenyang,China Associate Professor,Institute of Metal Research,academia sinica,shenyang 110015,China Inst of Metal Research Acad Sinica Shenyang China

Based on experimental study of the time dependence of the recoverable shape memory effect (SME)of shape memory alloys Ti50Ni50,Ti50Ni48Cu2 and Ti50Ni45Cu5 an empirical re- lationship between recoverable strain energy,U_r,and temperature,*** derived as: U_r=U_o[1-exp(-mT_R^n)] where m—characteristic constant related to material,and n-shape-temperature sensitivity. The Johnson-Mehl-Aerami's phenomenological description of the time dependence of phase transformation was adopted to obtain a semiquantitative relationship associated with recoverable *** thermoelastic martensite transformation and *** semiquantitative relationship is correspondent with the empirical expression.

关键词： shape memory effect recoverable strain energy shape-temperature sensitivity thermoelastic martensite

MICROSTRUCTURE OF RAPIDLY SOLIDIFIED TiAl ALLOY POWDER

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Acta Metallurgica sinica(English Letters) 1993年第2期6卷 117-120页

作者： CAO Mingzhou HAN Dong ZHANG Tao LI Dong Institute of Metal Research,academia sinica,shenyang,China Associate Professor,Institute of Metal Research,academia sinica,shenyang 110015,China Inst of Metal Research Acad Sinica Shenyang China

The rapidly solidified powder of Ti-34Al-2Mn alloy was obtained by means of ultrasonic gas atomisation (USGA) *** tupical size of the powder is 27 μm.X-ray diffraction results show that the powder consists of major α_2-phase and minor γ-*** optical microscope both equiaxed and dendritical microstructure features were observed on RS pow- der *** annealing at 900 ℃/for 2 h in vacuum,most of α_2-phase transforms into γ-phase,resulting in refinement of structure.

关键词： repid solidification TiAl intermetallic compound microstructure

NON-EQUILIBRIUM SEGREGATION STRUCTURE OF P IN COLD ROLLED Fe-P ALLOYS AND ITS RELATION WITH TEXTURE VARIATION

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Acta Metallurgica sinica(English Letters) 1992年第6期5卷 425-431页

作者： ZHANG Lixin NING Hua Laboratory of Corrosion Science,Institute of Corrosion and Protection of Metals,academia sinica.shenyang,ChinaZHOU Jing LI Liguang Institute of Metal Research,academia sinica,shenyang,China Professor,Institute of Corrosion and Protection of Metals,academia sinica,shenyang 110015,China Inst of Corrosion and Protection of Metals Acad Sinica Shenyang China

The relations between the non-equilibrium segregation process of P and the change of the texture in Fe-P alloys have been studied by analytical electron microscope and orientation distribution *** was shown that P segregated preferentialy on the{110}slip planes, the P segregation structures with repeating cycle a=1.582 nm form at 450℃.// ND direction abated.//ND direction ***{111}has a tendancy to transform into{111}texture in recovering process.{111}direction trans- forms into{111}direction after recrystalizing.A model to describe the effects of non-equilibrium segregation structures of P on orientation change was proposed and em- ployed to interpret the experiment results.

关键词： Fe-P Alloy lattice image recovering process non-equalibrium segregation structure

INFLUENCE OF APPLIED POTENTIAL AND LOADING WAVEFORM ON FATIGUE CRACK GROWTH FOR STEEL A537 IN 3.5% NaCl SOLUTION

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Acta Metallurgica sinica(English Letters) 1993年第12期6卷 459-464页

作者： LI Jin WANG Zengfu KE Wei Corrosion Science Laboratory,Institute of Corrosion and Protection of Metals,academia sinica,shenyang,China Institute of Corrosion and Protection of Metals,academia sinica,shenyang 110015,China Inst of Corrosion and Protection of Metals Shenyang China

Influence of applied potentials and loading waveform on the fatigue crack growth for steel A537 in 3.5% NaCl solution,and corresponding straining electrode behaviour have been *** the applied potentials over or below -800mV(SCE),the anodic dissolution or the hydrogen embrittlement is predominatant,*** applied anodic potential,the acceleration effect of continuous loading pattern on the CF crack growth mainly appeared at the range of low ΔK values,while for cathodic potential,it appeared at the high ΔK *** continuous straining causes a decrease of natural potential and an increase of anodic dissolution current.

关键词： corrosion fatigue steel A537 waveform potential straining eleclrode

LOW CYCLE FATIGUE OF Cr-Mn-N STAINLESS STEEL

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Acta Metallurgica sinica(English Letters) 1990年第3期3卷 183-187页

作者： XIA Yuebo WANG Zhongguang Institute of Metal Research,academia sinica,shenyang,China XIA Yuebo,Associate Professor,Institute of Metal Research,academia sinica,shenyang 110015,China

An investigation was conducted to examine the low cycle symmetric push-pull fatigue behaviour of the Cr-Mn-N dual-phase stainless *** groups of specimens,A and B, were used,they were solution treated at 1050 and 1250℃,*** life of group A is almost twice as long as that of group B under the same total strain *** energy loss during the fatigue tests and the mophology of the fracture surfaces have been stu- died and discussed.

关键词： low cycle fatigue fatigue life hardening saturation cyclic softening energy loss

SOLIDIFIED PRODUCT FROM Bi-Sr-Ca-Cu-O MELT AND ITS TRANSFORMATION INTO SUPERCONDUCTOR

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Acta Metallurgica sinica(English Letters) 1993年第6期6卷 383-390页

作者： ZHANG Cheng HU Zhuangqi GE Yunlong WANG Yongzhong QIAO Guiwen Institute of Metal Research,academia sinica,shenyang,China doctorate student Institute of Metal Research,academia sinica,shenyang 110015,China Inst of Metal Research Shenyang China

The Bi_2(Sr,Ca)_3Cu_2O_x system superconductor was prepared by different melting procedures and after *** effects of cooling rate,annealing temperature and time,as well as melting procedures on phase transformation were *** structure and properties were examined by X-ray diffraction,optical microscopy,EPMA,DTA,TGA and measurements of electric and magnetic *** the melt of nominal composition Bi_2(Sr,Ca)_3Cu_2O_x solidified in air,the Bi_2(Sr,Ca)_3Cu_2O_(8+δ)(2212)superconducting phase is stable,the easily solidified product including Bi_2(Sr,Ca)_2CuO_(6+δ)(2201)phase is metastable, and another may be amorphous if rapidly *** last two may transform into 2212 phase by after treatment at an optimal annealing temperature ranging 780—870℃.While 2201 phase,prepared by the laser floating zone melting method,may easily transform into 2212 phase at layer or filament in shape which is favourable to improve the links among superconducting grains and critical current density.

关键词： Bi system superconductor melt stability phase transformation