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�������պ����ѧѧ�� 2000, Vol. 26 Issue (5) :501-504    DOI:
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γ-TiAl������������ϵ���΢��֯����
���, �Ÿ���, ������, ������*
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Microstructures of Multi-phase Materials In-situ Formed in γ-TiAl��Based Alloys
LI Jian-guo, ZHANG Fu-xiang, WANG Li-jun, ZHANG Yong-gang*
Beijing University of Aeronautics and Astronautics, Dept. of Materials Science and Engineering

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ժҪ �о�������𡢹衢̼�� γ-TiAl������������ϵ���΢��֯����.��ѹ��4?GPa���¶�1?273?K����Ӧ�ϳ�ʱ��60?min��������,ͨ����ĩ���ԭλ�û����ȷ�Ӧ�Ʊ�����Ʒ.�о�����:Ti-Al-B��Ԫ�Ͻ���TiAl�ࡢTi3Al���TiB2��;Ti-Al-Si��Ԫ�Ͻ���TiAl�ࡢTi3Al���Ti5(Al,Si)3��;Ti-Al-C��Ԫ�Ͻ���TiAl���Ti3AlC��;Ti-Al-B-Si��Ԫ�Ͻ���TiAl�ࡢTi3Al�ࡢTiB2���Ti5(Al,Si)3��;Ti-Al-B-C��Ԫ�Ͻ���TiAl�ࡢTi3AlC���TiB2��;Ti-Al-B-Si-C��Ԫ�Ͻ���TiAl�ࡢTi3AlC�ࡢTiB2���Ti5(Al,Si)3��,����֯�dz�������Ԥ����Ƶ���֯.�ڴ˻����ϾͲ�ͬ������ܵ�Ӱ������˷���.
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Abstract�� The phases and microstructures in-situ formed by solid-state reaction were studied after the elements of B, C and Si were single and mixed doped to the TiAl-based alloys. The results showed that, in the Ti-Al-B alloys, the phases of TiAl, Ti3Al, and ��TiB2�� were formed; in the Ti-Al-Si alloys, the phases ofTiAl, Ti3Al and ��Ti5(Al, Si)3�� were formed; in the Ti-Al-C alloys, the phases of TiAl and Ti3AlC were formed; in the Ti-Al-B-Si alloys, the phases of TiAl, Ti3Al, TiB2 and ��Ti5(Al, Si)3�� were formed; in the Ti-Al-B-C alloys, the phases of TiAl, TiB2 and Ti3AlC were formed; Finally, in the Ti-Al-B-C-Si alloys, besides the TiAl phases, the phases of partice ��TiB2,�� acicular TiB2, lath Ti3AlC and massive Ti5(Al,Si)3 all appeared, and this microstructure was approximately the same as pre-designed, therefore an optimized property is expected.
Keywords�� in-situ   composite materials   micro structure   γ-TiAl based alloys     
Received 1999-05-19;
Fund:

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About author: ���(1962-),��,������ͨ��,��ʦ,100083,����.
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���, �Ÿ���, ������, ������.γ-TiAl������������ϵ���΢��֯����[J]  �������պ����ѧѧ��, 2000,V26(5): 501-504
LI Jian-guo, ZHANG Fu-xiang, WANG Li-jun, ZHANG Yong-gang.Microstructures of Multi-phase Materials In-situ Formed in γ-TiAl��Based Alloys[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2000,V26(5): 501-504
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2000/V26/I5/501
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