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

MSE461_Zi - 1 Surface Crystallization in a Liquid AuSi Alloy By Oleg G Shpyrko et al Harvard —— A Literature Study ——For MatSE 461 ——By

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Unformatted text preview: 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 2 Content Abstract (3) Introduction (4-7) Methods (8) Results (9-16) Problem Discussion (17-19) Summary (20) Reference (21) 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 . 4 Introduction: AuSi Alloy Phases near eutectic point Eutectic Mixture Amorphous alloy : Rapid chilling....
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This note was uploaded on 03/21/2012 for the course MSE 461 taught by Professor Rockett during the Fall '08 term at University of Illinois, Urbana Champaign.

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MSE461_Zi - 1 Surface Crystallization in a Liquid AuSi Alloy By Oleg G Shpyrko et al Harvard —— A Literature Study ——For MatSE 461 ——By

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