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�������պ����ѧѧ�� 2007, Vol. 33 Issue (07) :846-850    DOI:
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Processing and microstructure of Al2O3/YAG eutectic ceramic by laser rapid remelting
Su Haijun, Zhang Jun, Liu Lin, Fu Hengzhi*
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072, China

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ժҪ ���ü���������������Ʊ�Al2O3/YAG�������������մ�, �о�Al2O3/YAG�����մ��ڸ��ܼ�����������,��ͬɨ������(0.01~2.0��mm/s)�������¶��ݶ��µ�������֯����������������,̽�������������̿��Ʋ�����������֯�Ĺ�ϵ.�о��������:��������Al2O3/YAG�����մ����޹��������ֲ���Al2O3���YAG���������,û�о����������,Al2O3����������Ϊ(45.0±2.0)%,�����������,����ֲ�,�ǵ��͵Ŀ������̲�Ƭ״�ǹ��򹲾���֯;��������ϸ��, ���漤��ɨ���ٶȵ��������С,ɨ���ٶ�Ϊ0.02��mm/s ʱ,�������ԼΪ1~2��μm,ɨ���ٶ�Ϊ2.0��mm/sʱ,��������Ϊ0.5��μm����;�ۺ��ȷ�������,Al2O3/YAG�����۵�Ϊ2��096��K,����ͼ�Ǻ�.
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�ؼ����� ��������   Al2O3/YAG   �������������մ�   ΢����֯   ���¶��ݶ�     
Abstract�� Laser rapid remelting experiments were conducted on the preparation of Al2O3/YAG eutectic ceramic in-situ composite to investigate the microstructure characteristic and growth behavior under an ultra-high temperature gradient and different laser scanning rates of 0.01~2.0��mm/s, and to explore the relationship between the laser processing parameters and the microstructure. The results show that the laser remelted Al2O3/YAG eutectic is composed of irregularly and continuously distributed Al2O3 and YAG phases without grain boundary and any other phase. The volume fraction of Al2O3 is (45.0±2.0)%. The two phases couple each other and complexly interweave, in which the microstructure belongs to the typical lamellar structure of rapidly solidified anomalous eutectic. The eutectic spacing is very small and decreases from about 1~2��μm to 0.5��μm as the laser scanning rate increases from 0.02~2.0��mm/s. The synthetical themal analysis(STA) shows that the eutectic temperature of Al2O3/YAG is 2��096��K, matching the phase diagram of Al2O3-Y2O3 system.
Keywords�� laser remelting   Al2O3/YAG   eutectic ceramic in-situ composite   microstructure   high temperature gradient     
Received 2006-06-28;

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About author: �պ���(1981-),��,����������,��ʿ��,shjnpu@yahoo.com.cn.
�պ���, �ž�, ����, ����־.�����������Al2O3/YAG�����մɵ��Ʊ�����֯[J]  �������պ����ѧѧ��, 2007,V33(07): 846-850
Su Haijun, Zhang Jun, Liu Lin, Fu Hengzhi.Processing and microstructure of Al2O3/YAG eutectic ceramic by laser rapid remelting[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(07): 846-850
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