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| 1 | X-ray Peak-Shift Determination of Deformation Fault Probability in Fe-Mn-Si Alloys显示文摘The X-ray diffraction peak-shift method was introduced into the determination of deformation fault probability (α)of Fe-Mn-Si alloys with various Mn contents and thermomechanical cycling numbers. The precise lattice constantsrequired were obtained by numerical calculation instead of using standard sample without any fault. The influenceof internal stress on the determined α has been evaluated, and the caused relative error was determined as about 4%and thus negligible. The results show that the deformation fault probability increases with decreasing Mn-content andincreasing cycle number, which are qualitatively consistent with those results of Psf determined by peak-broadeningmethod. | YonghuaRONG GangHE ZhenghongGUO ShipuCHEN T.Y.Hsu(XUZuyao) | 2002 | Journal of Materials Science & Technology2002，18，5： | 4 |
| 2 | THEORETICAL PREDICTION OF THE KINETICS CURVES OFPEARLITIC TRANSFORMATION IN HYPO-PROEUTECTOID STRUCTURAL STEELS显示文摘Supposing carbon contents of ferrite phases in pearlite precipitating from austenite in multicomponent steel at temperature T and in Fe-C ystem at T’ are the same the pearlite formation temperature diference, can be calculated from the FeX phase diagrams and the equilibrium temperature Al. Using Tp and Fe-C binary thermodynamic model, the driving forces for phase transformation from austenite to pearlite in multicomponent steels have been successfully calculated. Through the combination of simplified Zener and Hillert’s model for pearlite growth with Johnson-Mehl equation, using data from known TTT diagrams, the interfacial energy parameter and activation energy for pearlite formation can be determined and expressed as functions of chemical composition in steels by regression analysis. The calculated starting curves of pearlitic transformation in some commercial steels agree well with the experimental data. | Z.G.Li H.B.Chang T.Y.Hsu Z.Y.Xu X.Y.Ruan | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，3： | 4 |
| 3 | THERMODYNAMICS OF MARTENSITIC TRANSFORMATION IN Fe-Mn-C AND Fe-Ni-C ALLOYS显示文摘A Central Atom Model is introduced and the LFG and Hsu models are modified in order toevaluate the driving force for the martensitic transformation in Fe-Mn-C and Fe-Ni-C al-loys.The results show that the relationship between the driving force and the yield strength ofaustenite at Ms temperature,σ0.2γ/Ms,fits Hsu’s formula;ΔG=2.1σ0.2γ/Ms+907J/mol.The Ms temperatures of Fe-Mn-C and Fe-Ni-C alloys are also calculated.Thecalculated results are in good agreement with experimental values. | XU Zuyao(T.Y.Hsu) PAN Mu Shanghai Jiaotong University,Shanghai,China Correspondent:XU Zuyao(T.Y.Hsu) Professor,Department of Materials Science,Shanghai Jiaotong University,Shanghai,China | 1990 | Acta Metallurgica Sinica(English Letters)1990，3，1： | 3 |
| 4 | Nucleation Mechanism for Bainite显示文摘Based on the experimental results that solute-depleted zone was observed in Cu-28Zn-4AI (mass fraction) at 523 K, AG is calculated as a positive according to the thermodynamic criteria for the spinodal decomposition of a ternary systems. So, the solute-depleted zone cannot be formed by spinodal decomposition. Dislocation density required by the formation of solute-depleted zone is estimated greater than 7.89×109 cm-2, according to the segregation of solute atoms around dislocations, which is not consistent with the practical situation for the alloy at 523 K. Associated with the internal friction experimental fact that internal friction peaks appear within the incubation for bainitic transformation in Cu-Zn-AI alloy, the equilibrium temperature, TO, is evaluated as 433 K for solute-depleted Cu-25Zn-3.4AI, which is lower than the experimental temperature 523 K. Thus, nucleation by shear mechanism is impossible in this circumstance. Therefore, it is concluded that, like bainite in steels and Ag-Cd, bainite | Xi ZHANG, Xuejun JIN and T.Y.Hsu(Xu Zuyao)School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China | 2002 | Journal of Materials Science & Technology2002，18，1： | 3 |
| 5 | Effect of Rare Earth Elements on Isothermal Transformation and Microstructures in 20Mn Steel显示文摘The effect of rare earth elements on the isothermal transformation and microstructures in 20Mn steel is in-vestigated by means of metallography and dilatometry.Rare earth elements decrease both the incubation periodof pro-eutectoid ferrite and the rate of pearlitic transformation.In addition,rare earth elements play a role ofreducing needle-like ferrite and the amount of pearlite,densifing the lamellar space of pearlite and enhcingsegregation of carbide in granular bainite.It is suggested that rare earth elements may decrease the interfacialenergy of grain boundary and interphase,hinder the diffusion of carbon atoms and form rare earth carbides withhigh melting point which reduce the carbon content in austenite. | 刘和 郑登慧 T.Y.Hsu徐祖耀 | 1992 | Journal of Rare Earths1992，10，3： | 2 |
| 6 | 查看详情显示文摘 | T.Y.Hsu(Z.Y.Xu) X.M.Li | | 0，，： | 1 |
| 7 | 查看详情显示文摘 | T.Y.Hsu(Z.Y.Xu) | | 0，，： | 1 |
| 8 | INFLUENCE OF GRAIN SIZE AND ORDERING OF PARENT PHASE ON M_s IN A CuZnAl ALLOY CONTAINING BORON显示文摘The effect of grain size and ordering of the parent phase on the critical points of thermoelasticmartensitic transformation in Cu-25.62 Zn-3.97 Al-0.0018 B(wt-%)shape memory alloyhas been investigated.Based on the thermodynamics of phase transformation,a linear rela-tionship between the starting temperature of martensitic transformation and the reciprocal ofthe square root of grain size is obtained,i.e.M_s temperature rises with increasing grain size.It shows a good agreement with the results of electric resistance measurement.Applying theLandau’s theory,a quantitative relationship between M_s and the ordering parameter of theparent phase is set up,which is well confirmed by the results of X-ray diffraction and electricresistance measurement.The activation energy of the ordering process in the parent phase ofthe alloy is calculated to be 46 kJ/mol. | WU Jianxin JIANG Bohong XU Zuyao (T.Y.Hsu) Shanghai Jiaotong University,Shanghai,China Associate Professor,Dept.of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai,China | 1989 | Acta Metallurgica Sinica(English Letters)1989，2，5： | 1 |
| 9 | 查看详情显示文摘 | T.Y.Hsu | | 0，，： | 1 |
| 10 | ENFLUENCE OF DEFORMATION AT MARTENSITE STATE ON SHAPE RECOVERY IN CuZnAl MEMORY ALLOYS显示文摘An investigation of the influence of deformation on shape recovery has been put forward inCu-Zn-Al shape memory alloys.Starting at a model of the re-orientation of martensitic va-riants,the principle and essentiality of the influence of the amount of pre-deformation ε onshape recovery rate η is elucidated. | LI Bing JIANG Bohong XU Zuyao(T.Y.Hsu) Shanghai Jiaotong University,Shanghai,China Correspondent:JIANG Bohong Associate Professor,Departemt of Materials Science,Shanghai Jiaotong University,Shanghai,China | 1990 | Acta Metallurgica Sinica(English Letters)1990，3，1： | 1 |
| 11 | THERMODYNAMICS OF BAINITIC TRANSFORMATION IN Cu-24 at.-% Al ALLOY显示文摘Two driving forces △G(β1)+α’and △Gβ1→β2+αfor the bainitic transformation have been calcu-lated for Cu-24 at.-% Al alloy.Results reveal △Gβ1→α’>0 within the transformation tem-perature range 600—750 K.Therefore,the bainitic transformation cannot be initiated by theβ1→α’ shearing mechanism.On the other hand,the driving force △Gβ1→β2+αto produce 5% ofthe α becomes negative only when the composition of the α satisfiesxAlα≤0.204 at 700 K or xAlα=0.209 at 750 K.So the bainitic transformation can only proceedby β1→β2+α diffusional reaction with different diffusion amount at different temperatures. | XU Zuyao (T.Y.Hsu) ZHOU Xiaowang Shanghai Jiaotong University,China Professor,Department of Materials Science,Shanghai Jiaotong University,Shanghai 200030,China | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，6： | 1 |
| 12 | A Mixed-control Mechanism Model of Proeutectoid Ferrite Growth under Non-equilibrium Interface Condition in Fe-C Alloys显示文摘By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-C alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from austenite. In this model, the α/γ interface is treated as non-equilibrium interface, i.e., the carbon concentration of austenite at γ/α interface is obtained through theoretical calculation, instead of that assumed as the local equilibrium concentration.For isothermal precipitation of ferrite in Fe-C alloys, the calculated results show that the rate of interface migration decreases monotonically during the whole process, while the rate of carbon diffusion from γ/α interface into austenite increases to a peak value and then decreases. The process of ferrite growth may be considered as composed of three stages: the period of rapid growth, slow growth and finishing stage. The results also show that the carbon concentration of austenite at γ/α interface could not reach the thermodynamic equilibrium value even at the last stage of ferrite growth. | RuihengWU XueyuRUAN HongbingZHANG T.Y.Hsu | 2004 | Journal of Materials Science & Technology2004，20，5： | 1 |
| 13 | Optimization of the Phase Diagram of CeO_2-ZrO_2 System显示文摘Revised phase diagram of the CeO2-ZrO2 system is optimized and the lattice stability parameters of CeO2 of various phases as well as solution parameters of phases (liquid, cubic, tetragonal and monoclinic) are simultaneously obtained by using the Kaufman and Nesor’s model for describing the ceramic solutions and the Lukas | Lin LI (Dept. of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)Zuyao XU (T.Y.Hsu)(Dept. of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China)Qing AO (Dept. of Materials Engineering, Shandong Polytech | 1996 | Journal of Materials Science & Technology1996，12，2： | 1 |
| 14 | THEORETICAL PREDICTION OF PROEUTECTOID FERRITICTRANSFORMATION IN HYPO-PROEUTECTOID STRUCTRAL STEELS显示文摘Proeutectoid ferrite with carbon content xo precipitating from austenite in a multicomponent steel at temperature T is supposed to be equivalent to proeutectoid ferrite with the same carbon content precipitating from austenite in Fe-C binary system at temperature T’.is described as the temperature difference of proeutectiod ferrite formation, and can be calculated from the Fe-X diagrams and the equilibrium temperature A3. By introducing Tf and basing on the thermodynamic model for Fe-C binary alloy, the driving force for phase transformation from austenite to proeutectoid ferrite in multicomponent steels has been successfully calculated. Through the Johnson-Mehl equation and using the data hem known TTT diagrams, the relationship between the chemical composition and the intedecial edenly packeter as well as activation energy for proeutectoid ferrite formation can be calculated. The starting curves of proeutectoid ferritic transformation calculated in this way in some hypo-proeutectoid structural steels agree well with the erperimental data. | H.B.Chang Z.G.Li T.Y.Hsu Z.Y.Xu X.Y.Ruan | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，3： | 0 |
| 15 | THERMODYNAMIC CRITERION OF SPINODAL DECOMPOSITION IN TERNARY SYSTEMS显示文摘By expanding the Gibbs free energy of a ternary system into a Taylor series with respect tothe composition,a thermodynamic criterion of spinodal decomposition is conducted asGxx(δx)2+2Gxxδxδy+Gyy(δy)2<0,from which,various conditions of spinodal decompositionare discussed.When Gxx<0 Gxy2-GxxGyy<0,it is called unstable decomposition unrestrictedby the direction of composition fluctuation;when Gxx<0,Gxy2-GxxGyy>0,or Gxx>0,Gxy2-GxxGyy>0,as well as Gxx=0,are all considered as unstable decomposition restricted bythe direction of composition fluctuation δx and δy.The phenomenon of turning round incomposition during spinodal decomposition is attempted to be explained from above point ofview.The computer calculated ranges of unstable decomposition according to the criterion ofspinodal decomposition on Cu-Ni-Fe ternary system is consistent with the experimental re-sults obtained from literatures. | JIANG Bohong ZHANG Meihua WEI Qing XU Zuyao(T.Y.Hsu) Shanghai Jiaotong University,Shanghai,China | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，8： | 0 |
| 16 | EFFECT OF MARTENSITE ORDERING ON SME IN A Cu-Zn-Al ALLOY显示文摘The correlation between the shape memory effect(SME)and the ordering degree inmartensite formed through various heat-treatment processes,e.g.ice water quenching,step-quenching and aging etc.,has been studied in a Cu-26Zn-4Al alloy.The martensite or-dering degree is estimated by △d,the spacing difference of some pairs of diffracting planeswith indices satisfying a relation of(h12-h22)/3=(k22-k12)/n(n=1 for 9R martensite,n=4for 18R martensite).M 18R martensite is obtained from step-quenching,in which the valueof △d increases with the holding duration of step-quenching,and the shape recoveryrate η increases synchronouslly.9R martensite is obtained from direct water-quenching,thevalue of △d is quite large and SME is also good at just quenching state.But both △dand η decrease continuously with aging time at room temperature.This stabilization phe-nomenon of martensite is explained by the observation of TEM lattice fringe image,and itmay be attributed to the clustering of quenched-in supersaturated vacancies at(001)M close-packed plane in martensite and decreasing the ordering degree.A reduction in△d and η occuring in the specimens on step-quenching or aging at higher temperature,which may be related to the precipitation of the α-phase and the enrichment of solute atoms,decreases the ordering degree. | QI Xuan JIANG Bohong XU Zuyao(T.Y.HSU) Shanghai Jiaotong University,Shanghai.China Qi Xuan,Dept.Marter.Sci.and Eng.,Shanghai Jiaotong University,Shanghai,China | 1989 | Acta Metallurgica Sinica(English Letters)1989，2，1： | 0 |
| 17 | SOME ASPECTS OF PROGRESS AND PERSPECTIVE IN MARTENSITIC TRANSFORMATION显示文摘Progress and perspective in martensitic transformations are described,including the definitionand the thermodynamics of martensitic transformatian,the effect of austenite state onmartensitic transformation,kinetics,nucleation and growth the as well as the crystallographyof martensitic transformation. | T.Y.Hsu | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，6： | 0 |
| 18 | THERMODYNAMICS OF MARTENSITIC TRANSFORMATION IN β-Cu BASE ALLOYS显示文摘An approach for the thermodynamics of the thermoelastic martensitic transformation in β-Cubase alloys is suggested.Driving forces for martensitic transformation,T0 and Ms tempera-tures in Cu-Zn,Cu-Al and Cu-Zn-Al alloys were calculated and the calculated Ms are ingood agreement with the experimental ones.Ordering of the parent phase lowers Ms(T0)inCu-Zn and Cu-Zn-Al alloys,but raises Ms(T0)in Cu-Al alloys.Two methods for the es-timation of the critical driving force for the thermoelastic martensitic transformation are alsointroduced. | T.Y.Hsu | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，6： | 0 |
| 19 | EFFECT OF MAGNETIC FIELD ON MARTENSITIC TRANSFORMATION IN Fe-21Ni-4Mn ALLOY显示文摘The pulsed magnetic field induced martensitic transformation with isothermal and athermalkinetics in Fe-2Ni-4Mn(wt-%)alloy has been studied by means of magnetizationmeasurements,optical microscopy and thermodymical analyses.It is shown that there exits acritical magnetic intensity for induing martensitic transformation at a given temperatureabove Ms.The critical magnetic field increases linearly with increasing ΔT= T-M_S.Themagnetic field strongly promotes the athermal martensitic transforamtion and restrains theisothermal one.The entropy change ΔS for athermal transformation at Ms is 4.13 J/mol·K.The effect of magnetic field on martensitic transformation in Fe-21Ni-4Mn alloy is main-ly due to Zeeman effect.Lath,plate and butterfly martensities were observed under magneticfield. | SUN Enxi Dalian Railway College,Dalian,ChinaYANG Dazhi Dalian University of Technology,Dalian,ChinaXU Zuyao (T.Y.Hsu) Shanghai Jiaotong University,Shanghai,ChinaYANG Fuming ZHAO Ruwen Institute of Physics,Academia Sinica,Beijing,China YANG Dazhi,Professor,Dalian University of Technology,Dalian 116024,China | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，1： | 0 |
| 20 | INFLUENCE OF AUSTENITE STRENGTHENING ON MARTENSITIC TRANSFORMATION IN Fe-Mn-C ALLOYS显示文摘The M_s temperature and the yield strength of austenite at M_s temperature have been meas-ured for five Fe-Mn-C alloys.The experimental results show that there is a linear relation-ship between them.The effect of the solution strengthening of austenite on martensitemorphology is also studied.It is pointed out that there is a characteristic temperature T_c inaustenite strengthening.Martensite morphology is mainly of dislocated laths when M_s>T_c,and is mainly of twinned plates when M_s<T_c.A theoretical analysis is given which is in goodagreement with experimental results. | PAN Mu XU Zuyao (T.Y.Hsu) Shanghai Jiaotong University,Shanghai,China XU Zuy(T.Y.Hsu),Professor,Dept.of Materials Science,Shanghai Jiaotong University,Huashan Road,Shanghai 200030,China | 1990 | Acta Metallurgica Sinica(English Letters)1990，3，3： | 0 |
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