First-principles theory calculations were used to investigate the segregation behavior of P and Mg as well as the interactions between Mg and P atα-FeΣ3(111)[11¯0]symmetrical tilt grain boundary(GB).Results dem...First-principles theory calculations were used to investigate the segregation behavior of P and Mg as well as the interactions between Mg and P atα-FeΣ3(111)[11¯0]symmetrical tilt grain boundary(GB).Results demonstrate that both P and Mg are segregated at GB,and P has a stronger segregation potency.Mg prefers to substitute at grain boundary plane with the largest absorbable vacancy,whereas P inclines to substitute at the sites near Fe atoms to form strong covalent Fe-P bonds.When Mg exists at GB,the segregation behavior of P may be greatly inhibited by the decrease in possible solution sites and the increase in segregation energy.P has stronger interactions with Mg at GB,forming a lower energy hybridization peak.These results can be used to explain why the addition of a small amount of Mg can ameliorate the temper embrittlement phenomenon.展开更多
由单一还原剂 NaH_2PO_2或 NaH_2PO_3与 KBH_4的复合还原剂分别在类镍溶液中获得 Ni-Fe-P 以及 Ni-Fe-P-B 合金膜,研究了这些新型合金膜的磁性。结果发现,铁磁性元素 Fe 含量增加导致原子平均磁矩及饱和磁化强度 Ms 增大;结构为非晶态...由单一还原剂 NaH_2PO_2或 NaH_2PO_3与 KBH_4的复合还原剂分别在类镍溶液中获得 Ni-Fe-P 以及 Ni-Fe-P-B 合金膜,研究了这些新型合金膜的磁性。结果发现,铁磁性元素 Fe 含量增加导致原子平均磁矩及饱和磁化强度 Ms 增大;结构为非晶态的合金膜具有较优的矫顽力 Hc 值;合金膜磁滞回线出现较低的矩形比说明化学镀制备态样品不够均匀;热处理温度高于400℃后,合金膜的饱和磁化强度连续减小,矫顽力急剧增大;同时,镀层的均匀性明显得到改善。展开更多
利用Fe Ti B熔体反应制备了TiB2颗粒增强铁基复合材料,研究了该材料的显微组织。热力学分析表明,Fe Ti B熔体具有反应生成TiB2的可能性。试验结果表明,TiB2颗粒均匀分布于α Fe晶粒中,晶内TiB2粒子平均间距大于晶界。TiB2粒子尺寸大多为...利用Fe Ti B熔体反应制备了TiB2颗粒增强铁基复合材料,研究了该材料的显微组织。热力学分析表明,Fe Ti B熔体具有反应生成TiB2的可能性。试验结果表明,TiB2颗粒均匀分布于α Fe晶粒中,晶内TiB2粒子平均间距大于晶界。TiB2粒子尺寸大多为1～6μm,形状大多为接近等轴的多面体。展开更多
文摘First-principles theory calculations were used to investigate the segregation behavior of P and Mg as well as the interactions between Mg and P atα-FeΣ3(111)[11¯0]symmetrical tilt grain boundary(GB).Results demonstrate that both P and Mg are segregated at GB,and P has a stronger segregation potency.Mg prefers to substitute at grain boundary plane with the largest absorbable vacancy,whereas P inclines to substitute at the sites near Fe atoms to form strong covalent Fe-P bonds.When Mg exists at GB,the segregation behavior of P may be greatly inhibited by the decrease in possible solution sites and the increase in segregation energy.P has stronger interactions with Mg at GB,forming a lower energy hybridization peak.These results can be used to explain why the addition of a small amount of Mg can ameliorate the temper embrittlement phenomenon.
文摘由单一还原剂 NaH_2PO_2或 NaH_2PO_3与 KBH_4的复合还原剂分别在类镍溶液中获得 Ni-Fe-P 以及 Ni-Fe-P-B 合金膜,研究了这些新型合金膜的磁性。结果发现,铁磁性元素 Fe 含量增加导致原子平均磁矩及饱和磁化强度 Ms 增大;结构为非晶态的合金膜具有较优的矫顽力 Hc 值;合金膜磁滞回线出现较低的矩形比说明化学镀制备态样品不够均匀;热处理温度高于400℃后,合金膜的饱和磁化强度连续减小,矫顽力急剧增大;同时,镀层的均匀性明显得到改善。
文摘利用Fe Ti B熔体反应制备了TiB2颗粒增强铁基复合材料,研究了该材料的显微组织。热力学分析表明,Fe Ti B熔体具有反应生成TiB2的可能性。试验结果表明,TiB2颗粒均匀分布于α Fe晶粒中,晶内TiB2粒子平均间距大于晶界。TiB2粒子尺寸大多为1～6μm,形状大多为接近等轴的多面体。
