分析了难混溶合金凝固过程中作用在凝固界面前沿液滴上的力,建立了液滴与凝固界面相互作用行为的动力学判据.结合实验,探讨了固/液界面与液滴间相互作用对Al-Bi基难混溶合金凝固组织演变的影响.结果表明,在界面排斥和Marangoni力共同作用下,较小尺寸的富Bi液滴被凝固界面排斥并富积在凝固界面前沿.当凝固界面为枝晶/胞状晶时,临界尺寸的富Bi液滴与界面发生部分捕获,凝固后形成"蝌蚪"型的富Bi粒子;尺寸较小的富Bi液滴被捕获在枝晶/胞状晶间,凝固后富Bi粒子分布于晶界和三叉交角处.
参考文献
| [1] | K(o)rber C,Rau G,Cosman M D,Cravalho E G.J Cryst Growth,1985; 72:649 |
| [2] | Stefanescu D M,Dhindaw B K,Ahuja S.Metall Trans,1988; 19A:2847 |
| [3] | Juretzko F R,Dhindaw B K,Stefanescu D M,Sen S,Curreri P A.Metall Trans,1998; 29A:1691 |
| [4] | Kennedy A R,Clyne T W.Cast Met,1991; 4:160 |
| [5] | He J,Zhao J Z,Ratke L.Acta Mater,2006; 54:1749 |
| [6] | He J,Zhao J Z,Wang X F,Gao L L.Metall Mater Trans,2005; 36A:2449 |
| [7] | He J,Zhao J Z.Acta Metall Sin,2005; 41:407(何杰,赵九洲.金属学报,2005;41:407) |
| [8] | Zhong Y B,Ren Z M,Sun Q X,Jiang Z W,Deng K,Xu K D.Acta Metall Sin,2003; 39:1269(钟云波,任忠鸣,孙秋霞,江志文,邓康,徐匡迪.金属学报,2003;39:1269) |
| [9] | Asthana R,Tewari S N.J Mater Sci,1993; 28:5414 |
| [10] | Monti R,Savino R,Alterio G.Acta Astronaut,2002; 51:789 |
| [11] | Kaptay G.Mater Sci Forum,2006; 508:269 |
| [12] | Uhlmann D R,Chalmers B,Jackson K A.J Appl Phys,1964; 35:2986 |
| [13] | Kim J M,Rohatgi P K.Mater Sci Eng,1998; A244:168 |
| [14] | Beshkov V N,Radoev B P,Ivanov I B.Int J Multiphase Flow,1978;4:563 |
| [15] | Dutta B,Surappa M K.Metall Mater Trans,1998; 29A:1329 |
| [16] | Coupard D,Girot F,Quenisset J M.J Mater Sci,1996;31:5305 |
| [17] | Zubko A M,Lobanov V G,Nikonova V V.Soviet Phys Crystallogr,1973; 18:239 |
| [18] | Shangguan D,Ahuja S,Stefanescu D M.Metall Trans,1992; A23:669 |
| [19] | He J.PhD Dissertation,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,2006(何杰.中国科学院金属研究所博士学位论文,沈阳,2006) |
| [20] | Geiger G H,Poirier D R.Transport Phenomena in Metallurgy.London:Addison-Wesley,1973 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%