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| 1 | Investigation of Amorphization of Nb-Si Alloys by Mechanical Alloying显示文摘Amorphous Nb_(62.5)Si_(37.5) and Nb_(75)Si_(25) alloys were produced from mixtures of elemental Nb and Si powders by mechanical alloying(MA).The structural changes of mechanically alloyed powders were monitored by x-ray diffraction.It was found that NbSi_(2),intermetallic compound was formed in the initial stage of MA of or Nb_(62.5)Si_(37.5) or Nb_(75)Si_(25) powders.With continued milling,the mixtures of intermetallic NbSi_(2) and elemental Nb transformed into amorphous Nb-Si alloys(Nb_(62.5)Si_(37.5) or Nb_(75)Si_(25)).The slow interdiffusion of Nb and Si and the slower diffusion of silicon atoms to niobium matrix than that of niobium atoms to silicon matrix were suggested to be responsible for the formation of intermetallic NbSi_(2).The amorphization of 3NbSi_(2)+7Nb mixtures(or NbSi_(2)+5Nb mixtures)is believed to be controlled by material transfer,which moves composition of line intermetallic NbSi2 off stoichiometry,and causes the matrix of elemental Nb deformed. | LI Bing MA Xueming LIU Lin QI Zhenzhong DONG Yuanda | 1994 | Chinese Physics Letters1994，11，11： | 4 |
| 2 | Mssbauer Spectroscopic Studies on a Supersaturated Solid Solution of Fe-Cu Formed by Mechanical Alloying显示文摘Mechanical alloying (MA) was employed to produce supersaturated solid solutions of Fe1-xCux,which is virtually immiscible under an equilibrium condition at ambjent temperature. The X-ray diffraction results show that the solutions formed in the concentration ranges of x≤0.1 5 and x≥0.40 are of bcc structure of iron and fcc structure of copper. respectively. For the region in between.however, the alloy obtained is a mixture of bcc plus fcc phases. The Mossbauer spectrum of the solid solution of a single phase could be fitted by two sub-spectra with hyperfine magnetic fields of 200 and 250 kOe. respectively. suggesting that there must exist two forms of coordination in the solution. While to fit the spectrum for the solution with mixed structu re. three Sub-spectra. including a spectrum of α-Fe, should be used. The variation of the Mossbauer spectra of Fe60Cu40 with milling time as well as annealing temperature was systematically studied. This may be ascribed to the changes of the number of nearest neighboring atoms of iron in the processes of formation and decomposition of the solid solution during milling and | Yuanzheng YANG and Xueming MA (Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)(To whom correspondence should be addressed)Yuanda DONG(Dept. of Metallurgy arid Materials, Shanghai University of Technology, Shanghai, 200072, China) | 1994 | Journal of Materials Science & Technology1994，10，2： | 3 |
| 3 | Mechanically Driven Alloying and Structural Evolution of Nanocrystalline Fe_(60)Cu_(40) Powder显示文摘Highly supersaturated nanocrystalline fcc Fe60Cu40 alloy has been prepared by mechanical alloying of elemental powders. The phase transformation is monitored by X-ray diffraction (XRD),Mossbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). The powder obtained after milling is of single fcc structure with grain size of nanometer order. The Mossbauer spectra of the milled powder can be fitted by two subspectra whose hyperfine magnetic fields are 16 MA/m and 20 MA/m while that of pure Fe disappeared. EXAFS results show that the radial structure function (RSF) of Fe K-edge changed drastically and finally became similar to that of reference Cu K-edge, while that of Cu K-edge nearly keeps unchanged in the process of milling. These imply that bcc Fe really transforms to fcc structure and alloying between Fe and Cu occurs truly on an atomic scale. EXAFS results indicate that iron atoms tend to segregate at the boundaries and Cu atoms are rich in the fcc lattice. Annealing experiments show that the Fe atoms at the interfaces are easy to cluster to α-Fe at a lower temperature, whereas the iron atoms in the lattice will form γ-Fe first at temperature above 350℃, and then transform to bcc | Yuanda DONG and Xueming MA(School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)Yuanzheng YANG(Dept. of Mechanical Engineering(2), South China University of Technology, Guangzhou 510641, China)Fangxin LIU and Genmiao WA | 1997 | Journal of Materials Science & Technology1997，13，4： | 1 |
| 4 | Amorphization of Co-Nb Magnetic Alloys by Mechanical Alloying显示文摘Formation of amorphous Co-Nb system by mechanical alloying(MA)in the composition range of Co_(25)Nb_(75)-Co_(70)Nb_(30) was studied by X-ray diffraction.Magnetic properties of the mechanically alloyed Co_(70)Nb_(30) powder were measured.The variation in H_(c) curve with milling time can be explained by two-stage mechanism involved in the milling process.The results show that the amorphous powder prepared by MA is of good soft magnetic properties. | MA Xueming YUE Lanping DONG Yuanda | 1991 | Chinese Physics Letters1991，8，8： | 1 |
| 5 | Deformation induced structural evolution in bulk metallic glasses显示文摘The structural behavior of binary Cu50Zr50 and ternary Cu50Zr45Ti5 bulk metallic glasses (BMGs) under applied stress was investigated by means of in-situ high energy X-ray synchrotron diffraction. The components of the strain tensors were determined from the shifts of the maxima of the atomic pair correlation functions (PDF) in real space. The anisotropic atomic reorientation in the first-nearest-neighbor shell versus stress suggests structural rearrangements in short-range order. Within the plastic deformation range the overall strain of the metallic glass is equal to the yield strain. After unloading,the atomic structure returns to the stress-free state,and the short-range order is identical to that of the undeformed state. Plastic deformation,however,leads to localized shear bands whose contribution to the volume averaged diffraction pattern is too weak to be detected. A concordant region evidenced by the anisotropic component is activated to counterbalance the stress change due to the atomic bond reorientation in the first-nearest-neighbor shell. The size of the concordant region is an important factor dominating the yield strength and the plastic strain ability of the BMGs. | WANG Gang MATTERN Norbert BEDNARCI Jozef XIA Lei ZHAI QiJie DONG YuanDa ECKERT Jvrgen | 2011 | Chinese Science Bulletin2011，56，36： | 1 |
| 6 | Dynamic mechanical behavior of a Zr-based bulk metallic glass during glass transition and crystallization显示文摘The dynamic mechanical behaviors of the Zr41Ti14Cu12.5Ni8Be22.5Fe2 bulk metallic glass (BMG) during continuous heating at a constant rate were investigated. The glass transition and crystallization of the Zr-based BMG were thus characterized by the measurements of storage modulus E′ and internal friction Q-1. It was found that the variations of these dynamic mechanical quantities with temperature were interre-lated and were well in agreement with the DSC trace obtained at the same heating rate. The origin of the first peak in the internal friction curve was closely related to the dynamic glass transition and subsequent primary crystallization. Moreover, it can be well described by a physical model, which can characterize atomic mobility and mechanical response of disordered condense materials. In comparison with the DSC trace, the relative position of the first internal friction peak of the BMG was found to be dependent on its thermal stability against crys-tallization. | CHAO Qi WANG Qing DONG Yuanda | 2009 | Rare Metals2009，28，1： | 1 |
| 7 | Nano-structure of Iron Formed by Mechanical Grinding显示文摘Nano-crystalline elemental iron powder was successfully formed by high-energy ball grinding.The x-ray diffraction,transmission electron microscopy and Mdssbauer spectroscopy were employed to follow the structure changes in the process of mechanical grinding with milling time.The thermal stability of nanocrystalline iron powder was also studied by differential scanning calorimetry.The results showed that the grain size reduces drastically at the initial stage of the milling and reaches 6nm after 40h milling.The broadening of Mdssbauer spectrum is attributed to the large fraction of iron atoms existing at the interfaces for the powder milled. | YANG Yuanzheng MA Xueming DONG Yuanda HE Yizhen WANG Gengmiao | 1992 | Chinese Physics Letters1992，9，5： | 1 |
| 8 | Mechanically-driven Amorphization in Metallic Systems显示文摘The mechanism of mechanically-driven amorphization was extensively surveyed in various systems.It was concluded that the amorphization could occur in the systems of Cu-Zr with a negative heat ofmixing (-ΔH) and Cu-Ta with a positive heat of mixing (+ΔH) by mechanical alloying of elementalpowders.Such amorphization could also be started from an intermetallic compound Cu_xZr_y with nochemical reaction involved.The energy storage by mechanical attrition should be the driving forcefor the amorphization.The atomic distribution function and nuclear resonance spectroscopic studiesshow that the mechanical alloying provides a true alloying on an atomic level.The alloys formed areof a characteristic structure common to the rapidly quenched amorphous alloys. | Yuanda DONG Dept.of Metallurgy and Materials,Shanghai University of Technology,Shanghai,200072,China | 1993 | Journal of Materials Science & Technology1993，9，3： | 0 |
| 9 | Influence of Milling Conditions on the Mechanical Alloying of Fe-B Powders显示文摘Amorphous and nanostructural Fe-B alloys made by mechanical alloying of elemental Fe and amorphous B powders have been studied using X-ray diffraction, differential scanning calorimetry and Mossbauer spectroscopy. It has been shown that the milling conditions have a strong effect on the alloying. The single phase amorphous alloy, which is limited at nominal composition of Fe60B40, has been produced only by milling in Ar atmosphere and in other composition range the mixture of nanostructure Fe-like phase and Fe2B compound with a little amorphous phase are obtained. While by milling in air atmosphere the introduction of oxygen in air may suppress the formation of amorphous phase, thus the compounds Fe2B may be synthesized with no trace of amorphous phase. The crystallization temperatures of amorphous phase in the resultant products are higher than those of a single amorphous alloy Fe60B40, and hardly independent of the milling conditions and the composition. In addition, it is revealed that detectable B content in the final products is lower than the nominal composition of all the initial samples, which indicates that some B atoms may be located in the disordered interfacial regions of the nanostructural alloyed mixtures. | Yang, Yuanzheng Li, Qiaoshen Zhu, Youlan Ma, Xueming Dong, Yuanda | 1999 | Journal of Materials Science & Technology1999，15，2： | 0 |
| 10 | Thermal stability and glass-forming ability of Y-Ce-Co-Al bulk metallic glasses显示文摘The thermal stability and glass-forming ability of Y56-xCexCo20Al24 (x=15, 20, 25, 28, 38, 41, 44) bulk metallic glasses with a diameter of 5 mm were investigated by differential scanning calorimetry and X-ray diffraction. The results show that the thermal stability of the alloys decreases with the addition of Ce. It has the best glass-forming ability when x=25, whose calculated values can reach about 30 mm in diameter. The effect of Ce element could be explained on the view of Miedema’s theory and elec- tronegativity difference of amorphous alloys. | Jun Li, Xueshan Xiao, and Yuanda Dong Institute of Materials, Shanghai University, Shanghai 200072, China | 2007 | International Journal of Minerals,Metallurgy and Materials2007，15，S1： | 0 |
| 11 | A Mssbauer Study on the Mechanically Alloyed Cu-Sn Alloys显示文摘Nanocrystalline E and η electron compounds and supersaturated solid solution of the Cu-Sn system have been prepared by mechanical alloying of elemental Cu and Sn powders. The atomie alloying and microstructure of the resultant alloys have been investigated by XRD, DSC and 119Sn Mossbauer spectroscopy. A little amount of SnO2 was detected by Mossbauer spectroscopy, although no trace of diffiaction peaks occurred in the XRD pattern. Thus the spectra for all the milled samples should be fitted using two quadrupole-splitting doublets: one corre sponding to SnO2, the other corresponding to the resultant alloys. The composition dependence of the hyperfine parameters has been eXtensively discussed and explained well with respect to oxidation, sudece effect resulting from grain refinement, coordination environment asymmetry and distortion caused or/and induced by mechanical alloying. | Yuanzheng YANG Youlan ZHU and Qiaoshen LI(Dept. of Materials Science and Engineering, Guangdong University of Technology, Guangzhou 510090, China)Xueming MA and Yuanda DONG(Dept. of Materials Science and Engineering, Shanghai University, Shanghai 200072, | 1998 | Journal of Materials Science & Technology1998，14，6： | 0 |
| 12 | Oncolytic adenoviruses expressing checkpoint inhibitors for cancer therapy显示文摘Despite the remarkable success of immune checkpoint inhibitors(ICIs),primary resistance to ICIs causes only subsets of patients to achieve durable responses due to the complex tumor microenvironment(TME).Oncolytic viruses(OVs)can overcome the immunosuppressive TME and promote systemic antitumor immunity in hosts.Engineered OVs armed with ICIs would likely have improved effectiveness as a cancer therapy.According to the diverse immune cell landscapes among different types of tumors,we rationally and precisely generated three recombinant oncolytic adenoviruses(OAds):OAd-SIRPα-Fc,OAd-Siglec10-Fc and OAd-TIGIT-Fc.These viruses were designed to locally deliver SIRPα-Fc,Siglec10-Fc or TIGIT-Fc fusion proteins recognizing CD47,CD24 or CD155,respectively,in the TME to achieve enhanced antitumor effects.Our results suggested that OAd-SIRPα-Fc and OAd-Siglec10-Fc both showed outstanding efficacy in tumor suppression of macrophage-dominated tumors,while OAd-TIGIT-Fc showed the best antitumor immunity in CD8+T-cell-dominated tumors.Importantly,the recombinant OAds activated an inflammatory immune response and generated long-term antitumor memory.In addition,the combination of OAd-Siglec10-Fc with anti-PD-1 significantly enhanced the antitumor effect in a 4T1 tumor model by remodeling the TME.In summary,rationally designed OAds expressing ICIs tailored to the immune cell landscape in the TME can precisely achieve tumor-specific immunotherapy of cancer. | Daoyuan Xie Yaomei Tian Die Hu Yuanda Wang Yuling Yang Bailing Zhou Rui Zhang Zhixiang Ren Mohan Liu Jie Xu Chunyan Dong Binyan Zhao Li Yang | 2023 | Signal Transduction and Targeted Therapy2023，8，12： | 0 |
| 13 | MECHANICAL REDUCTION OF CuO BY Mg AT ROOM TEMPERATURE显示文摘The mechanical reduction of CuO by pure metallic Mg has been investigated during pulver-izing in ball mill at room temperature.The reduction was towards its completion of an averageparticle size down to 20 nm after milling for 32 h.The mechanism of the mechanical reductionof oxides seems to be the surface activation of nano-metre sized particles driven by mechani-cal force. | MA Xueming YUE Lanping DONG Yuanda Institute of Solid State Physics,Academia Sinica,Hefei,China | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，3： | 0 |
| 14 | Grain Growth Kinetics and Debye Temperature of Nanometer TiO_2 Powders Prepared by a Sol-gel Process显示文摘The development of microstructure of nanometer TiO2 powders prepared by a sol-gel process was systematically studied. Grain growth was mon itored using X-ray diffraction (XRD) and transmission electron microscopy (TEM). and the Debye temperature of anatase crystallites was determined. It was found that the grain size of the powders increased slowly with annealing temperature up to 773 K. but grew rapidly in the temperature range of 773-1273K. The activation energies (Ea) for the growth of anatase crystallites in the two temperature regions were calculated to be 16 and 90 kJ / mol, respectively. The Debye temperatures of nanocrystalline anatase powders were all lower than that of microcrystalline anatase. which implies that the bonding force between Ti and O atoms in nanocrystalline TiO2 shourd be smaller than that in microcrystalline state. However. it was noted that the Debye temperature of nanocrystalline anatase increased with the decrease of grain size. This may be attributed to the enhancement in atomic bonding force due to the existence of high surface tension in nanocrystalline | Ju LUO Xingzhao DING Benpei CHEN and Jie KONG(Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)Yuanda DONG(Dept. of Metallurgy and Materials, Shanghai University of Technology, Shanghai, 200072, China) | 1994 | Journal of Materials Science & Technology1994，10，3： | 0 |
| 15 | Structural Characteristics of Rapidly Quenched Al-Si Alloys显示文摘The structure of rapldly quenched Al-Si alloys (1 and 4 wt-%Si) was systematically studied by optical and transmission electron microscopy (TEM ) as welI as X-ray djffractjon (XRD). ExperimentaIresults show that rapid solidification refines the grain size. extends the solid solubility of Si in Al and Introduces a high density ot defects which exist in the forms of vacancies, dislocations and dislocation loops. etc.. The decomposition process of the alloys was fol lowed by using differential scanning calorimeter (DSC) and the activation energy for precipitation of Si was obtained through Kissinger analysis. The precipitation behaviour of Supersaturated Si in both samples was further examined by TEM. It was found that Si mainly precipitated inside the grains in Al-1 wt-%Si alloy. while in Al-4 wt-%Si alloy. nearly all the Si precipitates distributed along the grain boundaries. This may be due to the structure difference between the alloys in as-quenched | Lin LIU(Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)Yuanda DONG(Dept. of Metallurgy and Materials, Shanghai University of Technology, Shanghai, 200072, China) | 1994 | Journal of Materials Science & Technology1994，10，3： | 0 |
| 16 | Fabrication of bulk glassy Zr_(41)Ti_(14)Ni_8Cu_(12.5)Be_(22.5)Fe_2 alloy by water quenching显示文摘A glassy Zr41Ti14Ni8Cu12.5Be22.5Fe2 rod with a diameter of 9 mm was successfully pro-duced by water puenching. The effects of iron addition on thermal stability and hardness of Zr41Ti14Ni8Cu12.5Be22.5Fe2 bulk amorphous alloy were investigated by XR D, DSC and microhardness test. it is found 1that the full annealing would enhance the strength of the alloy significantly. The cause of the increase in hardness was analyzed and the formation mechanisms of the bulk amorphous alloy are discussed. | Jl Yingfei, Jl Gang, XIAO Xueshan, DONG Yuanda, MA Xueming WANG Weihua & ZHAO Deqian1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2. Institute of Physics, Chinese Academy of Sciences, Beijing 10080, China Correspondence should be addressed to Ji Yingfei | 2000 | Chinese Science Bulletin2000，45，1： | 0 |
| 17 | FORMATION OF AMORPHOUS Al_(80)Fe_(20)BY MECHANICAL ALLOYING显示文摘Amorphous Al80Fe20 powder which can hardly be obtained using conventional rapid quenchingtechnique was directly prepared from crystalline Fe and A1 powders by means of mechanicalalloying process.The amorphization process was examined by X-ray analysis and M(?)ssbauerspectroscopy,and the thermal behaviour was studied by DSC.The results show that the rateof amorphization is controlled by the diffusion reaction at the interfaces and changes with themilling time.The effect of milling conditions on amorphization by mechanical alloying was al-so investigated. | WANG Weihua XIAO Keqin CHU Zhaoqin DONG Yuanda WANG Gengmiao | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，8： | 0 |
| 18 | EXTENSION OF SOLID SOLUBILITY BY MECHANICAL ALLOYING IN Fe-Cu SYSTEM显示文摘Mechanical alloying was employed to produce super—saturated solution of Fe1-xCux ,whichis virtually immiscible under an equilibrium condition at ambient temperature.XRD resultsshow that the solutions formed in the concentration ranges of x≤O.15 and x≥0.40 are of beestructure of x-Fe and fee structure of Cu,respectively.For the region in between(0.15<x<0.40),however,the alloy obtained is a mixture of bee plus fee phases.DSC tracesindicate that there exist two broad exothermal peaks for all samples,the first peak responds tothe releasing of stored strain and the second to the decomposition of solid solutions. | YANG Yuanzheng MA Xueming DONG Yuanda Institute of Solid State Physics,Academia sinica,Hefei,China Professor.Institute of Solid State Physics Academic Sinica,Hefei 230031,China | 1993 | Acta Metallurgica Sinica(English Letters)1993，6，2： | 0 |
| 19 | AMORPHOUS ALLOY Al-Y-Ni FORMED BY MECHANICAL ALLOYING显示文摘The amorphization transformation of Al-Y-Ni system by mechanical alloying was inves-tigated in both thermodynamic and kinetic aspects.The amorphous powder of Al-richcomposition Al80Y15Ni5 was formed after 70 h milling.The process of the amorphiza-tion was monitored by X-ray diffraction.The dependence of the amorphization on themilling intensity was also discussed.The results show that over milling with extra-highintensity has an unfavourable effect on amorphization of the system. | MA Xueming YANG Yuanzheng DONG Yuanda HE Yizhen Institute of Solid State Physics,Academia Sinica,Hefei,China | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，10： | 0 |
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