利用晶体相场模拟晶界的预熔以及熔化现象,研究不同取向差角度时,预熔及熔化的微观组织形貌,并且采用过剩质量方法定量计算预熔及熔化时晶界处液相薄膜宽度.研究表明,在接近熔点时,晶界处预先出现一层液相薄膜,液相膜的形态与晶界处的取向差角度有关.当取向差角为大角晶界时,液相膜沿晶界均匀稳定分布;当取向差角为小角晶界时,若干由液相区包围的独立位错均匀分布在晶界处,随着温度逐渐接近熔点,晶界处发生结构转变:独立位错两两合并,原来小的液相区也相应合并成为较大的“液相池”.这种结构转变不仅出现在预熔时,而且发生在过热状态下,在液相宽度曲线图上表现为宽度“跳跃”性增大.同时,晶体相场模型计算得到的临界润湿角θc为12°,较Read-Shockley理论所得的数值更接近实际结果.
参考文献
| [1] | Luo J.Crit Rev Solid State Mater Sci,2007; 32:67 |
| [2] | Straumal B B,Baretzky B.Interface Sci,2004; 12:147 |
| [3] | Inoko F,Okada T,Muraga T,Nakano Y,Yoshikawa T.Interface Sci,1997; 4:263 |
| [4] | Alsayed A M,Islam M F,Zhang J,Collings P J,Yodh A G.Science,2005; 309:1207 |
| [5] | Rappaz M,Jacot A,Boettinger W J.Metall Mater Trans,2003; 34A:467 |
| [6] | Wang N,Mokadem S,Rappaz M,Kurz W.Acta Mater,2004; 52:3173 |
| [7] | Suzuki A,Mishin Y.J Mater Sci,2005; 40:3155 |
| [8] | Olmsted D L,Dorel B,Ari A,Foiles S M,Mark A,Alain K.Phys Rev Lett,2011; 106:046101 |
| [9] | Luo J,Gupta V K,Yoon D H.Appl Phys Lett,2005; 87:231902 |
| [10] | Straumal B,Kogtenkova O,Protasova S,Mazilkin A,Zieba P,Czeppe T,Wojewoda-Budka J,Faryna M.Mater Sci Eng,2008; A495:126 |
| [11] | Keblinski P,Phillpot S R,Wolf D,Gleiter H.Acta Mater,1997; 41:631 |
| [12] | Tang M,Carter W C,Cannon R M.Phys Rev Lett,2006;97:075502 |
| [13] | Kikuchi R,Cahn J W.Phys Rev,1980; 21:5 |
| [14] | Besold G,Mouritsen O G.Phys Rev,1994; 50B:6573 |
| [15] | Ramakrishnan T V,Yussouff M.Phys Rev,1979; 19B:2775 |
| [16] | Elder K R,Katakowski M,Haataja M,Grant M.Phys Rev Lett,2002; 88:245701 |
| [17] | Elder K R,Grant M.Phys Rev,2004; 70E:051605 |
| [18] | Goldenfeld N,Athreya B P,Dantzig J A.Phys Rev,2005;72E:020601 |
| [19] | Stefanovic P,Haataja M,Provatas N.Phys Rev Lett,2006;96:225504 |
| [20] | Berry J,Grant M,Elder K R.Phys Rev,2006; 73E:031609 |
| [21] | Wu K A,Karma A,Hoyt J J,Asta M.Phys Rev,2006;73B:094101 |
| [22] | Wu K A,Karma A.Phys Rev,2007; 76B:184107 |
| [23] | Elder K R,Provatas N,Berry J,Stefanovic P,Grant M.Phys Rev,2007; 75B:064107 |
| [24] | Morris J R.Phys Rev,2002; 66B:144104 |
| [25] | Williams P L,Mishin Y.Acta Mater,2009; 57:3786 |
| [26] | Von Alfthan S,Kaski K,Sutton A P.Phys Rev,2007; 76B:245317 |
| [27] | Mellenthin J,Karma A,Plapp M.Phys Rev,2008; 78B:184110 |
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