摘要
利用表面机械研磨处理(SMAT)技术对Zr-4合金进行了表面纳米化处理,用XRD、光学显微镜、表面粗糙度仪对经SMAT不同时间合金表层的物相组成、平均晶粒尺寸、显微组织和表面粗糙度进行了分析,并使用硬度计测试了距表面不同深度处的硬度。结果表明:经SMAT后Zr-4合金表层的物相组成未改变;SMAT 15 min后Zr-4合金表层平均晶粒尺寸达到最小约为20 nm;SMAT后合金表层出现了一定厚度的塑性变形层;SMAT 60 min后合金表层的硬度约为基体硬度的1.3倍,且沿着深度方向逐渐减小;合金表面粗糙度随SMAT时间的延长先增大后减小最后趋于平稳。
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.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第4期89-92,共4页
Materials For Mechanical Engineering
基金
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)
