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《Journal of Plasticity Engineering》 2008-05
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Research on the constitutive equation of Al_(18)B_4O_(33)w/AZ91D composite during hot deformation

FANG Ting1 LI He-jun2 LI Zheng-jia4 OUYANG Hai-bo5(School of Material,Northwest Polytechnical University,Xi'an 710072 China)QI Le-hua3(School of Mechanical Electronics,Northwest Polytechnical University,Xi'an 710072 China)  
The hot compressive behavior at different temperature (300℃~400℃) and strain rate (0.001s-1~0.1s-1) of Al18B4O33w/AZ91D was investigated by use of Gleeble -1500D thermal simulation testing machine and the constitutive parameters were identified through the experiments.The strain rate sensitivity exponent(m) and apparent activation energy(Q) of the selected composite were determined according to true stress-strain curves.The results show that the flow stress decrease continually after the peak stress because of strain softening caused by whisker rotation and breakage.The exponential form represents high stress regime,the power form represents the low stress regime and the hyperbolic sine form represents all stress regime.The value of m and Q of composite are both higher than the matrix alloy because of the addition of Al18B4O33 whisker.
【Fund】: 国家自然科学基金资助项目(50575185);; 航空科学基金资助项目(05G53048);; 陕西省自然科学基金资助项目(2005E23)
【CateGory Index】: TB33
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