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�������պ����ѧѧ�� 2009, Vol. 35 Issue (8) :1031-1034    DOI:
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�����1, ������1, ���2*
1. �������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100191;
2. �������ղ����о�Ժ �������о���, ���� 100095
Homogeneity testing of aluminum metal matrix composites by TIRP method
Gao Yifei1, Zhou Zhenggan1, He Fangcheng2*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Department of Non-Destructive Testing, Beijing Institute of Aeronautical Materials, Beijing 100095, China

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Abstract�� In order to evaluate the homogeneity of SiCp reinforced aluminum metal-matrix composites (MMC) fabricated by powder metallurgy, an ultrasonic velocity imaging was carried out with the method of thickness independent reflector plate (TIRP). Accuracy and precision were improved and the thickness was unnecessary in the velocity imaging with TIRP method. Firstly, the purpose of ultrasonic velocity imaging of MMC and basic principle of TIRP were introduced. Secondly, the structure of ultrasonic scan system was described. A double-scan method was applied to improve accuracy. Thirdly, the experiment results of ultrasonic velocity imaging of MMC specimen obtained with back surface echo (BSE), single-scan and double-scan method of TIRP respectively were compared and discussed. The images generated with double-scan method of TIRP have more details than those with BSE and single-scan method. Finally, the factors affecting accuracy and precision in the implementation were considered which may be used to advance the experiment.
Keywords�� ultrasonic velocity measurement   metal-matrix composites   thickness independent reflector plate (TIRP)     
Received 2008-06-20;


About author: �����(1978��),��,������,��ʿ��,zzhenggan@buaa.edu.cn.
�����, ������, �η���.����TIRP�����������ϲ��Ͼ����Լ��[J]  �������պ����ѧѧ��, 2009,V35(8): 1031-1034
Gao Yifei, Zhou Zhenggan, He Fangcheng.Homogeneity testing of aluminum metal matrix composites by TIRP method[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(8): 1031-1034
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I8/1031
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