在室温条件下，通过紫外光诱导方法在 n 型单晶硅表面成功地生长出长度为1.66~5.80μm、宽度为1.27~2.84μm、厚度在0.24~0.73μm之间变化的铜微纳米粒子。采用电子显微镜（SEM）观察到单个铜粒子表面光滑，并出现数个粒子聚集形成K或L...在室温条件下，通过紫外光诱导方法在 n 型单晶硅表面成功地生长出长度为1.66~5.80μm、宽度为1.27~2.84μm、厚度在0.24~0.73μm之间变化的铜微纳米粒子。采用电子显微镜（SEM）观察到单个铜粒子表面光滑，并出现数个粒子聚集形成K或L形状的粒子团聚现象。结果表明：改变溶液组分浓度和光照时间可以对铜微纳米粒子的尺寸和致密度进行有效控制。以浓度为1·10-5 mol/L罗丹明6G作探测分子，对制备的铜微纳米粒子薄膜的表面增强拉曼散射（SERS）效应进行研究，证实经过铜微纳米粒子修饰后的单晶硅对其表面吸附分子的拉曼信号确实有增强作用，这是因为铜粒子的表面等离子体效应能够提高样品表面局域场的电场强度。展开更多
In this paper,15Cr-ODS steels containing 0,1 wt%,2 wt%and 3 wt%Al element were fabricated by combining wet-milling and spark plasma sintering(SPS)methods.The microstructure and mechanical properties of ODS steel were ...In this paper,15Cr-ODS steels containing 0,1 wt%,2 wt%and 3 wt%Al element were fabricated by combining wet-milling and spark plasma sintering(SPS)methods.The microstructure and mechanical properties of ODS steel were investigated by XRD,SEM,TEM,EBSD and tensile tests.The results demonstrate that the Al addition significantly refines the particle precipitates in the Fe-Cr matrix,leading to the obvious refinement in grain size of matrix and the improvement of mechanical properties.The dispersion particles in ODS steels with Al addition are identified as Al2O3 and Y_(2)Ti_(2)O_(7)nanoparticles,which has a heterogeneous size distribution in the range of 5 nm to 300 nm.Increasing Al addition causes an obvious increase in tensile strength and a decline in elongation.The tensile strength and elongation of 15Cr-ODS steel containing 3 wt%Al are 775.3 MPa and 15.1%,respectively.The existence of Al element improves the corrosion resistance of materials.The ODS steel containing 2 wt%Al shows corrosion potential of 0.39 V and passivation current density of 2.61×10^(−3)A/cm^(2)(1.37 V).This work shows that Al-doped ODS steels prepared by wet-milling and SPS methods have a potential application in structural parts for nuclear system.展开更多
文摘在室温条件下，通过紫外光诱导方法在 n 型单晶硅表面成功地生长出长度为1.66~5.80μm、宽度为1.27~2.84μm、厚度在0.24~0.73μm之间变化的铜微纳米粒子。采用电子显微镜（SEM）观察到单个铜粒子表面光滑，并出现数个粒子聚集形成K或L形状的粒子团聚现象。结果表明：改变溶液组分浓度和光照时间可以对铜微纳米粒子的尺寸和致密度进行有效控制。以浓度为1·10-5 mol/L罗丹明6G作探测分子，对制备的铜微纳米粒子薄膜的表面增强拉曼散射（SERS）效应进行研究，证实经过铜微纳米粒子修饰后的单晶硅对其表面吸附分子的拉曼信号确实有增强作用，这是因为铜粒子的表面等离子体效应能够提高样品表面局域场的电场强度。
基金Project(2020JJ2001)supported by Outstanding Youth Scientist Foundation of Hunan Province,ChinaProject(6142912200102)supported by Foundation for National Key Laboratory of Science and Technology on Highstrength Structural Materials,China。
文摘In this paper,15Cr-ODS steels containing 0,1 wt%,2 wt%and 3 wt%Al element were fabricated by combining wet-milling and spark plasma sintering(SPS)methods.The microstructure and mechanical properties of ODS steel were investigated by XRD,SEM,TEM,EBSD and tensile tests.The results demonstrate that the Al addition significantly refines the particle precipitates in the Fe-Cr matrix,leading to the obvious refinement in grain size of matrix and the improvement of mechanical properties.The dispersion particles in ODS steels with Al addition are identified as Al2O3 and Y_(2)Ti_(2)O_(7)nanoparticles,which has a heterogeneous size distribution in the range of 5 nm to 300 nm.Increasing Al addition causes an obvious increase in tensile strength and a decline in elongation.The tensile strength and elongation of 15Cr-ODS steel containing 3 wt%Al are 775.3 MPa and 15.1%,respectively.The existence of Al element improves the corrosion resistance of materials.The ODS steel containing 2 wt%Al shows corrosion potential of 0.39 V and passivation current density of 2.61×10^(−3)A/cm^(2)(1.37 V).This work shows that Al-doped ODS steels prepared by wet-milling and SPS methods have a potential application in structural parts for nuclear system.
