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VARIATIONAL CALCULATION OF THERMODYNAMIC PROPERTIES OF SUPERCOOLED LIQUID metalS

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Acta metallurgica Sinica(English Letters) 1990年第12期3卷 403-409页

作者： SHEN Tao WANG Jingtang institute of metal research,Academia Sinica National laboratory of {2. solidified non-equilibrium alloys,shenyang,china

By means of Gibbs-Bogoliubov (GB) thermodynamic variational calculation,the thermodynamic properties of the supercooled liquid metals,such as the 3rd family elements Al,Ga and Tl and transition metal Ti were calculated using the hard-sphere (HS) system as *** values of mean atomic volume,Helmholtz free energy,internal energy and entropy as well as specific heat at constant volume,isothermal bulk modulus,thermal expan- sion coefficient and specfic heat under constant pressure were *** glass transition temperature,T_g,is easily obtained from the C_p-T *** glass forming ability for metal can be predicted from T_g/T_m,which is in agreement with the experimental results.

关键词： supercooled liquid metal hard-sphere system thermodynamic variational calculation specific heat glass transition temperature

Influence of Ageing Heat Treatment on the High Cycle Fatigue of an 8090 Al-Li Alloy

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Journal of Materials Science & Technology 1994年第6期10卷 445-450页

作者： Suhua AI Zhongguang WANG Yun ZHANG and Zhuangqi HU(State key laboratory for Fatigue and Fracture of Materials,{2.,chinese academy of sciences, shenyang 110015, china) Inst of metal research Shenyang China

Fatigue lives for the smooth and notched specimens of 8090 Al-Li alloy jn the different ageing conditions have been studied. For the smooth samples of 8090 alloy the artificial ageing results in an increase in fatigue life in comparison with natural ageing. On the contrary, the notched specimens of 8090 alloy in the naturally aged condition show higher fatigue life than in the peak-aged. The exposure to either the peak-aged or naturally aged leads to superior fatigue properties of Al-Li alloy to the traditional high strength aluminum alloys of 7075 and 2.2., especially in the latter aged condition. In all ageing conditions, i,e. naturally, under-, peak- and over-aged, the peak-aged 8090 alloy displays the highest fatigue life and the over-aged material has a minimum value at the same stress amplitude. The difference in fatigue life is mainly attributable to the size and distribution of strengthening precipitates as well as the wide of precipitate free zones (PFZ's) along grain boundaries.

关键词： Al Li Influence of Ageing Heat Treatment on the High Cycle Fatigue of an 8090 Al-Li Alloy

Discussion of Dissipation Structure in a Directionally solidified Alloy

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Journal of Materials Science & Technology 1994年第3期10卷 229-231页

作者： Liling SUN Qi WU Jinghua ZHANG and Zhuangqi HU (State key Lab. of rapidly {2. nonequilibrium alloys, institute of metal research, Academia Sinica,shenyang, 110015, china) Inst of metal research Academia Sinica Shenyang China

The dissipation theory was introduced into the solidification area to describe the inherent laws of solidification from a new viewpoint. Discussion demonstrates that the solid / liquid interface in a directionally sol... 详细信息

关键词： Discussion of Dissipation Structure in a Directionally solidified Alloy

ON THE ADOPTION OF λ_0 VALUE FOR ROSCOE'S EQUATION

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Acta metallurgica Sinica(English Letters) 1992年第5期5卷 369-372页

作者： GUO Wenquan WANG Jingtang laboratory of rapidly {2. non-equilibrium alloys,institute of metal research,Academia Sinica,shenyang,china

Considering the availability and derivation of Roscoe's equation for absolute viscosity calcula- tion,the method to adopt λ_0 value,so-called λ_f,was proposed by experimentally deter- mining relational curve of the measured height,H,of metal melt vs logarithmic oscillation decrement,λ,extrapolating H into zero,if such corresponding λ value is *** results show that the proposed method not only satisfies the availability of original equation but also eliminate the effects of:“end and slippage”,so as to improve the accuracy for liquid Cu and Sn examinations.

关键词： liquid metal viscosity Roscoe's equation oscillatioal decrement

CHARACTERIZATION OF MECHANICALLY ALLOYED Ni-Al-Ti COMPOUNDS

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Acta metallurgica Sinica(English Letters) 1995年第Z1期8卷 583-587页

作者： LIU Zhiguang GUO Jianting HU Zhuangqi (National key laboratory for RSA and Department of Superalloy and Special Casting,{2. of metal research, chinese academy of sciences, shenyang 110015), china Inst of metal research {2. Acad of Science Shenyang China

Based on the previous work on the mechanical alloying of Ni-Al-Ti compounds. the mechanically alloyed Ni-Al-Ti compounds was characterized. The results show that with the increase of Ti content. the microhardness of the final products decrease apparently. The thermal behavior of the resultant Ni-Al-Ti compounds shows significant difference, the as-milled powders with different Ti content transform into different products after *** the microstructure of the milled alloys could be determined through adequate control of composition and heat treatments.

关键词： mechanical alloying. Ni-Al-Ti properties

Quenchability and Magnetic Properties of Nd_4Fe_(82.B_(14)

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Journal of Materials Science & Technology 1998年第6期14卷 543-546页

作者： Tiemin ZHAO Yunyan HAO Xiaorong XU and Zhuangqi HU(State key Lab. for RSA, institute of metal research,{2., shenyang 110015, china) State key Lab. for RSA Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The glass forming ability (GFA), crystallization behaviour and magnetic properties of Nd4Fe82.14 produced by melt spinning were investigated. The experimental results show that the GFA is rather Strong; the crystals precipitation sequence is as follows: Am(amorphous)→Am'+bcc-Fe →Nd2.e2.B3+Fe2.B6+bcc-Fe→Fe2.B6+Fe3B+Nd2.e14B+bcc-Fe→Fe3B+Nd2.e14B+bcc-Fe. The magnetic properties after crystallization are not affected by the cooling rate and the best magnetic properties are Br=0.8436 T, Hcj=2.6.4 kA/m, (BH)max=48.08 kJ/m3.

关键词： Quenchability and Magnetic Properties of Nd4Fe Nd

Effect of Sputtered TiAlCr Coatings on Oxidation and Hot Corrosion Resistance of Ti-2.Al-14Nb-3V

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Journal of Materials Science & Technology 2001年第5期17卷 501-506页

作者： Fuhui WANG, Chunhong GUAN, Zhaolin TANG and Weitao WU State key laboratory for Corrosion and Protection,{2., The chinese academy of sciences, shenyang 110016, china chinese Acad Sci Met Res Inst State Key Lab Corros & Protect Shenyang 110016 Peoples R China

The effect of sputtered Ti-50Al-10Cr and Ti-50A1-2.Cr coatings on both isothermal and cyclic oxidation resistance at 800-900℃ and hot corrosion resistance at 850℃ of Ti-2.Al-14Nb-3V was investigated. Results indicated that Ti-2.Al-14Nb-3V alloys exhibited poor oxidation resistance due to the formation of Al2.3+TiO2.AlNbO4 mixed scales in air at 800-900℃ and poor hot corrosion resistance due to the spoliation of scales formed in Na2.O4+K2.O4 melts at 850℃. Both Ti-50Al-10Cr and Ti-50Al-2.Cr coatings remarkably improved the oxidation and hot corrosion resistance of Ti-2.Al-14Nb-3V alloy.

关键词： Ti Cr Effect of Sputtered TiAlCr Coatings on Oxidation and Hot Corrosion Resistance of Ti-2.Al-14Nb-3V Al

Corrosion of Iron and Four Commercial Steels in a Cl-Containing Oxidizing Atmosphere at 500-600℃

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Journal of Materials Science & Technology 2004年第2期20卷 213-216页

作者： Ke ZHANG, Yan NIU, Chaoliu ZENG and Weitao WUState key laboratory for Corrosion and Protection,{2., chinese academy of sciences, shenyang 110016, china Lab. for Corrosion and Protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The corrosion behaviors of Fe and four commercial steels with different Cr contents were investigated in an oxidizing atmosphere containing HCI at 500~600℃, which simulated the environment to which materials are usually exposed in waste incineration. All the test materials underwent an accelerated corrosion in this atmosphere and small amounts of chlorine could be detected at the metal/scale interface. The corrosion mechanism is discussed on the basis of thermodynamic considerations for the reactions between metals and mixed O-Cl gases.

关键词： Commercial steels High temperature Chlorination Waste incineration

Electrical Resistance Measurement of Glass Transition and Crystallization Characteristics of Zr-Al-Cu-Ni metallic Glasses

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Journal of Materials Science & Technology 2002年第6期18卷 492-496页

作者： Yaping WANG and Ke LUState key laboratory for RSA,{2., chinese academy of sciences, shenyang 110016, china chinese Acad Sci Met Res Inst State Key Lab RSA Shenyang 110016 Peoples R China

In this paper, glass transition and thermal stability of the Zr-AI-Cu-Ni metallic glasses were investigated by using electrical resistance measurement (ERM), DSC and X-ray diffraction techniques. The experimental results show that the ERM is capable of detecting the glass transition of the amorphous alloys and can help to distinguish the crystallization products of the Zr-AI-Cu-Ni metallic glasses owing to the difference of the electrical resistivity between the precipitation phases.

关键词： Zr-Al-Cu-Ni metallic glasses Electrical resistance Glass transition Crystallization