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《Materials for Mechanical Engineering》 2009-04
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Microstructure and Properties of Zr-4 Alloy after Surface Mechanical Attrition Treatment

DUAN Xiao-ge,ZHAO Xi-cheng,ZHANG Cong-hui,LAN Xin-zhe,HE Xiao-mei(Xi'an University of Architecture and Technology,Xi'an 710055,China)  
Surface nanocrystallization of Zr-4 alloy was conducted by means of surface mechanical attrition treatment(SMAT).The surface layers of samples processed SMAT for different times were characterized by means of X-ray diffraction,optical microscope and roughness instrument.Microhardness tester was applied to identify the hardness of the sample at different depths.The results show that SMAT didn't change the XRD patterns of the sample.The average grain size of Zr-4 alloy surface was refined to the minimum value of 20 nm after SMAT for 15 min.A certain thickness of plastic deformation layer formed on the surface after SMAT.After SMAT for 60 min,the surface hardness of the alloy was about 1.3 times of the base hardness and decreased with the increase of the depth from the surface.Roughness of the alloy increased first and then declined to a stable value with the increase of SMAT time.
【Fund】： 国家自然科学基金重点资助项目(5043430);; 陕西省教育厅专项基金资助项目(07JK307)
【CateGory Index】： TG146.4
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