Bulk nanostructured 316L austenitic stainless steel （SS） samples with nano-scale twin bundles embedded in nano-sized grains were synthesized by using dynamic plastic deformation （DPD）. Subsequent thermal an-nealin...Bulk nanostructured 316L austenitic stainless steel （SS） samples with nano-scale twin bundles embedded in nano-sized grains were synthesized by using dynamic plastic deformation （DPD）. Subsequent thermal an-nealing of the as-DPD sample leads to a single austenitic structure with static recrystallized （SRX） grains in nanostructured matrix. Oil-lubricated sliding tests of ball-on-disc type were carried out for the as-DPD and the as-annealed DPD steel samples in comparison with coarse grained （CG） steel samples. Experimental results show that the as-DPD 316L steel exhibits a little enhanced wear resistance under a load of 10 N, and nearly identical wear resistance under a load of 30 N relative to that of the CG sample. After annealing, the wear resistance roughly follows the Archard equation under a load of 10 N. However, the wear resistance increases with increasing hardness, and decreases with a further increase in hardness under a load of 30 N. The highest wear resistance can be found in the DPD sample annealed at 750 ℃ for about 20 min, which is more than 46% higher than that of the CG steel sample. This phenomenon is originated from the microstructure with an optimized combination of strength and ductility as a result of moderate plastic deformation in SRX grained regions.展开更多
采用电沉积法,在柔性不锈钢网基底上制备了ZnO纳米棒阵列,随后旋涂P25浆料,最终经退火后得到了ZnO纳米棒阵列/TiO_2纳米粒子的复合结构薄膜,详细探讨了TiO_2纳米粒子的填充,初级ZnO纳米棒阵列的形貌,P25浆料的旋涂次数以及表面活性剂PE...采用电沉积法,在柔性不锈钢网基底上制备了ZnO纳米棒阵列,随后旋涂P25浆料,最终经退火后得到了ZnO纳米棒阵列/TiO_2纳米粒子的复合结构薄膜,详细探讨了TiO_2纳米粒子的填充,初级ZnO纳米棒阵列的形貌,P25浆料的旋涂次数以及表面活性剂PEG添加量等制备条件对复合结构光阳极形貌及光电性能的影响。研究表明:TiO_2纳米粒子的引入能有效提高光阳极的比表面积,增强半导体与染料的耦合能力,ZnO纳米棒阵列能够为电子提供快速传输的通道。最佳制备条件为:初级ZnO纳米棒沉积次数为两次,浆料浓度为1 g/50 m L,旋涂浆料次数为三次,PEG添加量为4 g/100 m L,制备的复合结构DSSC的光电转换效率较单一纳米棒阵列有一定的提高。展开更多
基金Financial supports from the MOST 973 Project (Grant No. 2012CB932201)the International S&T Cooperation Project of China (Grant No. 2010DFB54010)+2 种基金the National Natural Science Foundation of China (Grant No.51141008)the CAS International Cooperation Project(Grant No. GJHZ1033)the CAS-Croucher Funding Scheme for Joint Laboratories and the Danish-Chinese Centre for Nano-metals (Grant No. 50911130230)
文摘Bulk nanostructured 316L austenitic stainless steel （SS） samples with nano-scale twin bundles embedded in nano-sized grains were synthesized by using dynamic plastic deformation （DPD）. Subsequent thermal an-nealing of the as-DPD sample leads to a single austenitic structure with static recrystallized （SRX） grains in nanostructured matrix. Oil-lubricated sliding tests of ball-on-disc type were carried out for the as-DPD and the as-annealed DPD steel samples in comparison with coarse grained （CG） steel samples. Experimental results show that the as-DPD 316L steel exhibits a little enhanced wear resistance under a load of 10 N, and nearly identical wear resistance under a load of 30 N relative to that of the CG sample. After annealing, the wear resistance roughly follows the Archard equation under a load of 10 N. However, the wear resistance increases with increasing hardness, and decreases with a further increase in hardness under a load of 30 N. The highest wear resistance can be found in the DPD sample annealed at 750 ℃ for about 20 min, which is more than 46% higher than that of the CG steel sample. This phenomenon is originated from the microstructure with an optimized combination of strength and ductility as a result of moderate plastic deformation in SRX grained regions.
文摘采用电沉积法,在柔性不锈钢网基底上制备了ZnO纳米棒阵列,随后旋涂P25浆料,最终经退火后得到了ZnO纳米棒阵列/TiO_2纳米粒子的复合结构薄膜,详细探讨了TiO_2纳米粒子的填充,初级ZnO纳米棒阵列的形貌,P25浆料的旋涂次数以及表面活性剂PEG添加量等制备条件对复合结构光阳极形貌及光电性能的影响。研究表明:TiO_2纳米粒子的引入能有效提高光阳极的比表面积,增强半导体与染料的耦合能力,ZnO纳米棒阵列能够为电子提供快速传输的通道。最佳制备条件为:初级ZnO纳米棒沉积次数为两次,浆料浓度为1 g/50 m L,旋涂浆料次数为三次,PEG添加量为4 g/100 m L,制备的复合结构DSSC的光电转换效率较单一纳米棒阵列有一定的提高。
