MSE461_09-02-2011_Zichao Ye _Talk_Surface Crystallization (1)

MSE461_09-02-2011_Zichao Ye _Talk_Surface Crystallization (1)

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    1 Surface Crystallization in  a Liquid AuSi Alloy By Oleg G. Shpyrko et al., Harvard —— A Literature Study ——For MatSE 461 ——By Zichao Sept. 2nd Science   Vol. 313   7 JULY 2006
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2 Content Abstract (3) Introduction (4-7) Methods (8) Results (9-16) Problem Discussion (17-19) Summary (20) Reference (21)
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3 Abstract Presenting evidence for  surface crystallization  in liquid eutectic alloy  Au 82 Si 18 . Discovering an  enhanced surface layering  as compared to previous reports  for any liquid metal or alloy. Relating such unusual surface structure to a newly suggested  dense  packing cluster model  for amorphous bulk solid.      X-ray measurements  reveal  a crystalline monolayer  at the  surface of the  eutectic liquid Au 82 Si 18 , at temperatures above the alloy’s melting point.  Surface- induced atomic layering , the hallmark of liquid metals, is also found below the  crystalline monolayer. The layering depth, however, is  threefold greater  than that of  all liquid metals studied to date. The crystallinity of the surface monolayer is notable,  considering that AuSi does not form stable bulk crystalline phases at any concentration  and temperature and that no crystalline surface phase has been detected thus far in  any pure liquid metal or nondilute alloy. These results are discussed in relation to  recently suggested  models of amorphous alloys .
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4 Introduction: AuSi Alloy Phases near eutectic point Eutectic Mixture Amorphous alloy : Rapid chilling.
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