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《Metal Hotworking Technology》 2007-10
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Study on Compression Deformation and Fracture Mechanisms of Spray Deposited 7075/SiCp Composite

YANG Shou-zhi1,YANG Zhong-wang2,YAN Liang2,YUAN Wu-hua(1.Department of Mechanical Manufacture,Guangdong Senior Technical Institute,Huizhou 516100,China; 2.School of Materials Science and Engineering,Hunan University,Changsha 410082,China)  
The compression deformation and fracture mechanisms of 7075/SiCp prepared by spray deposition technique were investigated.The results show that the increase of surface friction drag and deformation temperature can effectively accelerate the densification.The drum degree increases with the increase of friction coefficient,deformation degree and the initial ingot ratio of length and diameter.There are four kinds of fracture ways of 7050/SiCp composite under high-temperature compression,which are the evulsions of SiCp from the matrix due to forming cavity near the interface and intensive phase,ductile fracture of the matrix due to the nucleation of cavity near the interface,the fracture near SiCp particulate coacervate and brittle fracture of the SiCp particulate.The interception of the fracture strain track of the composite increases first and then decreases with the increase of deformation temperature,which reaches the maximum value at the compression temperature of 420℃.Favorable lubrication makes the fracture strain track upgrade and the area of safe deformation extende.The area of deformation fracture decreases with the increase of opposity density of the composite.
【CateGory Index】: TB33
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