[an error occurred while processing this directive]
���¿��ټ��� �߼�����
   ��ҳ  �ڿ�����  ��ί��  Ͷ��ָ��  �ڿ�����  ��������  �� �� ��  ��ϵ����
�������պ����ѧѧ�� 2007, Vol. 33 Issue (08) :978-981    DOI:
���� ����Ŀ¼ | ����Ŀ¼ | ������� | �߼����� << | >>
�����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

Download: PDF (1391KB)   HTML 1KB   Export: BibTeX or EndNote (RIS)      Supporting Info
ժҪ ������Ԫ��ϵ΢���ೡ����ѧģ��,�Խϵ���Ũ�ȵ�Ni75Al4V21�Ͻ��Ъ�γ′���θ��������ڽ��м����о�,ģ���˺Ͻ��ԭ��ͼ���ݻ�����,��������θ��(Ni3V)��ͪ�γ′��(Ni3Al)������ڳɷ�������ֲ��ͳ���������ֲ�.�������,��θ��������,��������Ϊ�ȳɷ�����+ʧ�ȷֽ�,�ȳɷ����򻯲����ǻ�ѧ�����ȵĵ���θ�����,�������ֿ�,ʧ�ȷֽ�Ϊһ����ķֽ�����,��Ҫ��������紦,�γɻ�ѧ������θ������;��ʧ�ȷֽ����ͬʱ����γ′����θ��紦�ԷǾ��������κ˷�ʽ�����Ĺ���,���γɷǻ�ѧ������γ′������,���𽥳���Ϊ��ѧ������γ′������,�Ӷ��γ�2�������๲�����֯��̬.��
Email Alert
�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.
�����, �� 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
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2007/V33/I08/978
Copyright 2010 by �������պ����ѧѧ��