基于微观相场动力学模型,编制了包含共格畸变能的二元立方合金沉淀过程微观组织演化的计算机模拟程序,开展了不同共格畸变能作用下,溶质浓度为20at%的二元镍基合金的粗化机制的计算机模拟.研究发现:共格畸变能为零时,粗化遵循LSW机制,仅仅由颗粒的尺寸大小决定;随着共格畸变能的增大,粗化过程遵循混合机制,由沉淀颗粒的大小和位向(颗粒间的相对位置)共同决定;当共格畸变增大到一定程度时,粗化过程纯粹由颗粒间的位向决定,处于弹性"软"方向上的颗粒优先长大,而处于弹性"软"方向外的颗粒将消失掉.
The program of simulation for the evolution of microstructure during the precipitated process of binary cubic alloy including coherent strain energy is carried out based on the microscopic phase-field kinetic model. The precipitate's coarsening mechanism in Ni-based alloy with 20% solute (atomic fraction) under different coherent strain energies are studied. The results show that when the coherent strain energy is neglected, coarsening process follows LSW mechanism, which is decided only by the size of the precipitate; with increasing of coherent strain energy, coarsening process follows the mixed mechanism which is decided by both the size and orientation (mutual position) of the precipitates. When the coherent strain energy increases to some extent, coarsening process is decided only by the orientation of the particles, which grow up and coarsen preferentially along the elastically soft directions (<01>directions) and the particles lying out of the soft directions disappear.
参考文献
| [1] | Cahn R W;Haasen P;Kramer E J.Phase Ttransformation in Materials[M].北京:科学出版社,1998:249. |
| [2] | 冯端.金属物,相变[M].北京:科学出版社,2000:122. |
| [3] | Khachaturyan A G;Semenovskaya S;Tsakalakos T .[J].Physical Review B:Condensed Matter,1995,52(22):15909. |
| [4] | Susumu Onaka;Noriko Kobayashi;Toshiyuki Fuyii et al.[J].Intermetallics,2002,10:343. |
| [5] | Toru Miyazaki;Toshiyuki Koyama .[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1993,68(05):891. |
| [6] | Miyazaki T .[J].Materials Transactions,2002,43(06):1266. |
| [7] | Xiaoling Li,ZHENG Chen,Bing Liu,Yongxin Wang.Transition from Metastablity to Instability in Dynamics |
| [8] | Wang Yunzhi;Chen Longqing;Khachaturyan A G .[J].Scripta Metallurgica et Materialia,1991,25:1969. |
| [9] | Khachaturyan A G.Theory of Structural Transformation in Solids[M].New York:Wiley,1983:129. |
| [10] | Wang Y;Chen L Q;Khachaturyan A G.Solid-Solid Phase Transformations[M].Warrendale,Penn,USA:TMS Society,1994:245. |
| [11] | Poduri R;Chen L Q .[J].Acta Materialia,1997,45(01):245. |
| [12] | Chen Longqing;Khachturyan A G .[J].Scripta Metallurgica et Materialia,1991,25:61. |
| [13] | Wang Y;Chen L Q;Chen A G et al.[J].ACTA METALLURGICA ET MATERIALIA,1993,41:279. |
| [14] | Tyapkin Y D;Gongadze I V;Maliyenko Y I .[J].Physics of Metals and Metallography,1988,66(03):160. |
| [15] | Toru Miyazaki;Toshiyuki Koyama;Takao Kozakai .Computer simulations of the phase transformation in real alloy systems based on the phase field method[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1/2):38-49. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%