应用微观相场方法计算了Ni75Al21.5Ti3.5合金873K时效时的沉淀行为.利用原子演化图、长程序参数和成分序参数的演化、有序相颗粒的平均直径、颗粒数目及合金原子在α、β位置占位几率的演化等研究手段,讨论了Al、Ti原子的有序化和原子簇聚过程;有序相的形核机制及粗化行为;原子的择优占位行为.结果表明:有序相颗粒的形核机制为失稳分解机制,Al原子基本达到有序排列,同时存在Ni-Al原子反位,Ti原子未达到完全有序排列,在γ'有序相中择优占据Al位,且有序相生成过程中,前期的生长动力学指数为1/2,后期的生长动力学指数为2/5.
参考文献
| [1] | Rawling R D;Staton-Bevan A E .The alloying behavior and mechanical properties of polycryslalline Ni3Al(γ' phase) with ternary additions[J].Materials Science,1975,10:505. |
| [2] | Saito Y .The Monte-Carlo simulation of the ordering knetic of fcc to L12 structure in Ni-Al-X ternary alloys[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1997,223:10-16. |
| [3] | A.O.MEKHRABOV;M.V.AKDENIZ;M.M.ARER .ATOMIC ORDERING CHARACTERISTICS OF Ni_3Al INTERMETALLICS WITH SUBSTITUTIONAL TERNARY ADDITIONS[J].Acta materialia,1997(3):1077-1083. |
| [4] | Chen L Q;Yang W .Computer simulation of the domain dynamics of a quenched system with a large number of nonconserved order parameter:The graingrowth kinetics[J].Physical Review B,1994,50(21):15752-15756. |
| [5] | Amitabha Chakrabarti;Raul Toral;James D Gunton .Late-stage coarsening for off-critical quenches:Scaling functions and the growth law[J].Physical Review E,1993,47(05):3025-3038. |
| [6] | Rogers T M;Elder K R;Rashmi C D .Numerical study of the late stages of spinodal decomposition[J].Physical Review B,1988,37(16):9638-9649. |
| [7] | Allen S M;Cahn J W .A macroscopic theory for antiphase boundary motion and its application to antiphase domain coarsening[J].Acta Metallurgica,1979,27:1085-1095. |
| [8] | Seigert M;Rao M .Ordering dynamics of a conserved vector order parameter[J].Physical Review Letters,1993,70:1956-1959. |
| [9] | Y.S. Li;Z. Chen;Y.L. Lu .Coarsening kinetics of intermetallic precipitates in NI_(75)Al_xV_(25-x) alloys[J].Journal of Materials Research,2007(1):61-67. |
| [10] | LI Yongsheng,CHEN Zheng,LU Yanli,WANG Yongxin,ZHANG Jianjun.Computer simulation for the precipitation process of Ni75Al7.5V17.5 alloy[J].自然科学进展（英文版）,2004(12):1099-1103. |
| [11] | CHU Zhong,CHEN Zheng,WANG Yongxin,LU Yanli,LI Yongsheng.Atomic-scale computer simulation for ternary alloy Ni-Cr-Al during early precipitation process[J].自然科学进展（英文版）,2005(07):656-660. |
| [12] | Chu Z;Chen Z;Wang YX;Lu YL;Zhang JJ .Microscopic phase-field simulation of atom substitution behaviour in Ni-Cr-Al alloy[J].Chinese physics letters,2005(8):1841-1844. |
| [13] | Yongsheng LI,ZHENG Chen,Yanli LU,Yongxin Wang.Computer Simulation of the Interphase Boundary Evolution in Ni75AlxV25-x Alloy[J].材料科学技术学报（英文版）,2005(03):395-398. |
| [14] | R.PODURI;L.-Q.CHEN .COMPUTER SIMULATION OF THE KINETICS OF ORDER-DISORDER AND PHASE SEPARATION DURING PRECIPITATION OF δ' (Al3Li) IN Al-Li ALLOYS[J].Acta materialia,1997(1):245-255. |
| [15] | Miyazaki T;Koyama T;Kozakai T et al.Computer simulation of the phase transformation in real alloy systems based on the phase field method[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2001,312:38-49. |
| [16] | R.Poduri;L.-Q.Chen .Computer simulation of atomic ordering and compositional clustering in the pseudobinary Ni_3Al-Ni_3V system[J].Acta materialia,1998(5):1719-1729. |
| [17] | Mishima Y;Ochiai S;Yodagama Y M .Mechanical properties of Ni3 Al with ternary addition of transition metal elements[J].Transactions of the Japan Institute of Metals,1986,27(01):41-50. |
| [18] | Pareige-Schmuck C.;Blavette D.;Soisson F. .Ordering and phase separation in low supersaturated Ni-Cr-Al alloys: 3D atom probe and Monte Carlo simulation[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1):99-103. |
| [19] | C.L.FU;G.S.PAINTER .POINT DEFECTS AND THE BINDING ENERGIES OF BORON NEAR DEFECT SITES IN Ni_3Al: A FIRST-PRINCIPLES INVESTIGATION[J].Acta materialia,1997(2):481-488. |
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