|
|
|
| MICROSCOPIC PHASE-FIELD SIMULATION COUPLED WITH ELASTIC STRAIN ENERGY FOR γ′(Ni3Al) PRICIPITATION IN Ni-Al ALLOY |
| LU Yanli; CHEN Zheng;LI Yongsheng; WANG Yongxin |
| School of Materials Science and Engineering; Northwestern Polytechnical University; Xi'an 710072 |
|
Cite this article:
LU Yanli; CHEN Zheng; LI Yongsheng; WANG Yongxin. MICROSCOPIC PHASE-FIELD SIMULATION COUPLED WITH ELASTIC STRAIN ENERGY FOR γ′(Ni3Al) PRICIPITATION IN Ni-Al ALLOY. Acta Metall Sin, 2007, 43(3): 291-296 .
|
|
|
Abstract Based on the microscopic phase-field dynamic model and the microelasticity theory, the morphology evolution of γ′ phase(Ni3Al)and early precipitation mechanism in Ni-Al alloy were studied. Simulation results show that γ′ phase changes from initial circular or irregular shape into the quadrate shape and their orientations become more obvious during precipitation process, in the later stage, the γ′ precipitates present quadrate shape with round corner and regularly align along the [10] and [01] directions. Under the effect of elastic strain energy, the coarsening process follows the rule of preferential election, the particles lying in the elastic soft directions grow and coarsen further; the particles lying out of the elastic soft direction shrink and dissolve, highly preferential selected microstructure is formed in the later precipitation process. The early precipitation mechanism is the non-classical nucleation and growth, the evolution of γ′ phase is in the order: supersaturated solid solution→nonstoicheometric ordered phase→stoicheometric γ′ phase→growth.
|
|
Received: 14 July 2006
|
|
|
[1]Wendt H,Hassen P.Acta Metall,1993;31:1649
[2]Banerjee D,Banerjee R,Wang Y.Scr Mater,1999;41: 1023
[3]Vaithyanathan V,Chen L Q.Acta Mater,2002;50:4061
[4]Sob J R,Lee H M.Acta Mater,1997;45:4743
[5]Ardell A J,Maheshwari A.Acta Metall Mater,1995;43: 1825
[6]Miyazaki T.Mater Trans,2002;43:1266
[7]Vaithyanathan V,Chen L Q.Acta Mater,2002;50:4061
[8]Wen Y H,Chen L Q,Hazzledine P M,Wang Y.Acta Mater,2001;49:2341
[9]Khachatuyran A G.Theory of Structural Transformations in Solids.New Tork:Wiley,1983:23
[10]Jiang Z H,Wang Y X,Chen Z.Acta Metall Sin,2004;40: 616 (江志华,王永欣,陈铮．金属学报,2004;40:616)
[11]Miyazaki T,Koyama T,Kozakai T.Mater Sci Eng,2001; A312:8
[12]Shen C,Simmons J P,Wu K,Wang Y.Materials De- sign Approaches and Experiences.Warrendale,PA:TMS, 2001:57
[13]Poduri R,Chen L Q.Acta Mater,1997;45:245
[14]Miyazaki T,Koyama T,Kozakai T.Mater Sci Eng,2001; A312:38
[15]Li X L,Chen Z,Liu X G,Liu B.Acta Metall Sin,2002; 38:458 (李晓玲,陈铮,刘晓光,刘兵．金属学报,2002;38:458)
[16]Pareige C,Blavette D.Scr Mater,2001;44:243
[17]Prikhodko S V,Carnes J D,Isaak D G,Ardell A J.Scr Mater,1998;38:67
[18]Qiu Y Y.Acta Mater,1996;44:4969
[19]Chen L Q,Khachaturyan A G.Scr Metall,1991;25:67 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
