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�������պ����ѧѧ�� 2002, Vol. 28 Issue (5) :540-542    DOI:
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�Ż�1, ������2, �Ŷ���2, ������2*
1. �������պ����ѧ ���Ͽ�ѧ�빤��ϵ;
2. ��������ҵ��ѧ ���Ͽ�ѧ�빤��ѧԺ
Morphology and Formation Mechanism of Primary TiB2 in TiAlB Alloys
ZHANG Hu1, GAO Wen-li2, ZHANG Er-lin2, ZENG Song-yan2*
1. Beijing University of Aeronautics and Astronautics, Dept. of Materials Science and Engineering;
2. Harbin Institute of Technology, School of Materials Science and Engineering

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ժҪ ��ԭλ�������Ʊ���Ti-53Al-x B�Ͻ�,����X���������ǡ�ɨ��羵�ԺϽ������ɺ�΢����֯�������о�.�������:�úϽ���Ҫ��TiAl��TiB2�������;����TiB2����������״,��TiAlB�Ͻ����̹�����,Alԭ�Ӹ����ڳ���TiB2��-Һ����ǰ��,���¹�-Һ������Bԭ�ӹ����ͶȲ�����������,ʹ��-Һ�����ò��ȶ�, �Ӷ���TiB2(0001)���ϲ���͹̨������״��֦;��֦�ĸ�����ȡ����ĸ���ȡ��һ��,�ڳ���TiB2(0001)���͹̨״������״��֦���ܹ۲쵽������̨��.
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Abstract�� Microstructure and phase constitution of Ti-53Al-x��Balloys produced by an ��in-situ�� growing method were investigated by X-ray diffraction and scanning electron microscope respectively. The results show that these alloys are composed of TiAl and TiB2 phase, while the primary hexagonal prism TiB2 exhibits pyramidal protrusion or rod shape dendrites on its basal facets. The protrusions or rods exhibit facets which parallel to that of the primary TiB2. The solid-liquid interface stability of primary TiB2 was discussed and the formation mechanism of the morphology of primary TiB2 was investigated.
Keywords�� titanium alloys   metallic matrix composites   boride   crystal growth     
Received 2001-01-15;
About author: �� ��(1964- ),��,ɽ��������,���о�Ա,100083,����.
�Ż�, ������, �Ŷ���, ������.TiAlB�Ͻ��г���TiB2����ò�����γɻ���[J]  �������պ����ѧѧ��, 2002,V28(5): 540-542
ZHANG Hu, GAO Wen-li, ZHANG Er-lin, ZENG Song-yan.Morphology and Formation Mechanism of Primary TiB2 in TiAlB Alloys[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2002,V28(5): 540-542
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