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|標題:||GRAIN BOUNDARY WETTING PHASE TRANSFORMATIONS IN THE Zn-Sn AND Zn-In SYSTEMS||作者:||Gornakova, A.S.
|關鍵字:||transition;microstructure;alloys;lines||Project:||Reviews on Advanced Materials Science||期刊/報告no：:||Reviews on Advanced Materials Science, Volume 21, Issue 1, Page(s) 18-26.||摘要:||
The wetting phase transition of grain boundaries (GBs) by the melt has been studied in the Zn - 6 wt.% Sn and Zn - 5.3 wt.% In polycrystals and Zn bicrystals (two [10 (1) over bar 0] tilt GBs with misorientation angles f = 19 degrees and 66 degrees, and one [11 (2) over bar 0] tilt GB with misorientation angle phi = 79 degrees, wetting by the In-rich melt). In the Zn - 6 wt.% Sn polycrystals, the fraction of the completely wetted GBs gradually increases from 20 to 70% with increasing temperature between 260 and 400 degrees C. In the Zn - 5.3 wt.% In polycrystals, the fraction of the completely wetted GBs gradually increases from 20 to 65% with increasing temperature between 215 and 395 degrees C. Temperature dependences of the contact angle theta(T) for bicrystals were measured using scanning electron microscopy and light microscopy. 0 decreases with increasing T and reaches zero (complete wetting) at a certain temperature T(w). It has been observed for the first time that temperature dependences of contact angle intersect (at about 350 degrees C). The wetting transformation for Zn GBs is discontinuous (first order): q(T) dependence is convex, d theta/d T has a break at T(w) and theta similar to ((T-T(w))/T(w))(1/2). Tilt GBs in Zn-Sn and Zn-In systems become completely wetted when about 60-70% of GBs with higher energy are already completely wetted in a polycrystal.
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