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| 1 | OPTICAL PROPERTIES OF GeO_2 AND Ge NANOCRYSTALS显示文摘he co m pound m aterial of n m size particles Ge O2 Si O2 w as synthesied through hydrolysis of Si( O C2 H4) and Ge Cl4 . A heat treatm ent w as carried out for the sa m ples at 100 ~1200 ℃in air . Its optical property w as deter mined by U V Vis spectur m . We have found that theabsorption edge of spectru m shifted progressively to longer w avelengths . The quantu m size ef fect of nanocrystals appears because crystals gro w and energy of optical band gap reduces d ueto the influence of te m perature . By the analysis of X ray diffraction w e have observed theprocess in w hich the structure of particles changed fro m disorder into order . | Y.H.Zhou 1) ,Y.Y.Feng 2) and H.Y.Lu 2) 1)Department of Physics Nanjing Normal University, Nanjing 210097,China 2)Physics and Ch寁O P T I C A L P R O P E R T I E S O F Ge O2 A N D Ge N A N O C R Y S T A L S Y. H. Zhou1) , Y. Y. Feng2) | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 22 |
| 2 | Nucleationcontrolled bulky metastable γ phase Ti-45Al-2Cr-2 Nb alloy显示文摘 | Y.C.Liu G.C.Yang X.F.Guo Y.H.Zhou | | 0，，： | 1 |
| 3 | Solidification structure formation in undercooled Fe-Ni alloy显示文摘 | J.F.Li W.Q.Jie G.C.Yang Y.H.Zhou | | 0，，： | 1 |
| 4 | 查看详情显示文摘 | Y.H.Zhou W.R.Miao L.B.Chen | | 0，，： | 1 |
| 5 | Forming mechanism of metastable 'dendrite core' in undercooled Fe-Ni alloy显示文摘 | Y.Z.Chen G.C.Yang F.Liu N.Liu H.Xie D.Chen C.L.Yang Y.P.Su Y.H.Zhou | | 0，，： | 1 |
| 6 | REMOVE INCLUSIONS FROM ALUMINUM MELT INELECTROMAGNETIC FIELD显示文摘Electromagnetic separation of non-metallic inclusions from Al-Si melt is studied by theoretical analysis and experiments on self-designed electromagnetic separation apparatus. Metallographs and LECO Image Analysis System were used to analyze the content of alumina in aluminum alloy before and after electromagnetic separation. It is seen that removal effciency increases with the increase of electromagnetic force (EMF) and diameter of inclusion particles while decreases with the increase of melt velocity and height of separator. All alumina particles with diamete of 14μm have been removed successfully from the melt. | T.X.Li Z.M.Xu B.D.Sun D.Shu Y.H.Zhou | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，5： | 0 |
| 7 | CELLULAR SPACING SELECTION OF Al-0.53wt%Zn ALLOY UNDER NEAR-RAPID DIRECTIONAL SOLIDIFICATION CONDITION显示文摘In order to investigate the response of cellular spacing to the variation of growth velocity under near-rapid directional solidification condition, Al-0.53wt%Zn alloy is directionally solidified with Bridgman apparatus. The results show that at the given temperature gradient the obtained microstrvctures are all cells and there exists a wide distribution range of cellular spacing. The maximum, λmax, minimum, λmin, and average cellular spacing, λ, as functions of growth rate, V, can be given by λmax=948.51V-0.4961, λmin= 661.16V-0.5015 and λ=412.41V-0.5049, respectively. The experimental results are compared with that predicted by KGT model, and a good agreement is found. Moreover,it is found that the average cellular spacing is also remarkably history-dependent. | J.Feng W.D.Huang X.Lin T.Li Y.F.Xue Y.H.Zhou | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，5： | 0 |
| 8 | SOLIDIFICATION MECHANISM OF UNDERCOOLEDSINGLE PHASE ALLOYS显示文摘The solidification behavior of bulk undercooled Ni50Cu50 alloy was systematically investigated. Double recalescences were discovered for the first time in a single phase Ni-Cd alloy, in which there is no solid phase transition at elevated temperature. When the alloy melt was undercoolcd below the solidus temperature, the effect of nonequilibrium solidification could make the solid with the norminal composition C0 of the alloy nucleate and grow till tempemture approached To (the temperuture at which the free enengies of solid and liquid with C0 are equal). Following it, the nucleation and growth of the solid with more high melting point component were required, so the secondary recalescence took place. The concentration distribution in crystals was also analysed. | J.F.Li G.C.Yang Y.H.Zhou | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 0 |
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