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Ni75Al4V21�Ͻ��������΢���ೡ��ģ��
�����1, �� Ծ1, �� �2*
1. �������պ����ѧ ���Ͽ�ѧ�빤��ѧԺ, ���� 100083;
2. ������ҵ��ѧ ����ѧԺ, ���� 710072
Simulation for early precipitation process of Ni75Al4V21 alloy by microscopic phase-field model
Zhao Yuhong1, Zhang Yue1, Chen Zheng2*
1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. School of Materials Science, Northwestern University of Ploytechnology, Xi-an 710072, China

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�ؼ����� ��&gamma   &prime   ���&theta   ����   Ni75Al4V21�Ͻ�   �������   �ೡ��ģ��     
Abstract�� The microscopic phase-field kinetic model for ternary system was applied to investigate the precipitation process of ��γ��′ and ��θ�� phase in Ni75Al4V21alloy. The evolution of atomic pictures was simulated, and the composition and long-range order parameters of ��θ�� (Ni3V) and ��γ��′ (Ni3Al) were calculated. The results show that ��θ�� forms earlier, its precipitation mechanism is congruent ordering followed by spinodal decomposition; By congruent ordering, a nonstoicheometric single ��θ�� ordered phase is produced with the order domains being separated by phase boundaries; Spinodal decomposition occurs predominantly at phase boundaries, and then the stoicheometric ��θ�� phase is formed; At the same time, ��γ��′ (Ni3Al) appears at phase boundaries of ��θ�� phase by nonclassical different phase nucleation mechanism, the nonstoicheometric ��γ��′ phase forms earlier and gradually transforms into the stoicheometric ��γ��′ phase, so two kinds of ordered phases appear simultaneously in the system.
Keywords�� ��γ��&prime   and ��θ�� ordered phase   Ni75Al4V21 alloy   precipitation process   phase-field model     
Received 2006-10-09;
About author: ����� (1974 -) Ů,�ӱ�ʯ��ׯ��,��ʿ��,zyh388@sina.com.
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�����, �� Ծ, �� �.Ni75Al4V21�Ͻ��������΢���ೡ��ģ��[J]  �������պ����ѧѧ��, 2007,V33(08): 978-981
Zhao Yuhong, Zhang Yue, Chen Zheng.Simulation for early precipitation process of Ni75Al4V21 alloy by microscopic phase-field model[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(08): 978-981
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