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三体系统中的Efimov态

通过求解Faddeev方程,研究了量子三体系统中的Efimov效应.改进了变分方法对于求解激发态的不足.在不同的两体作用下得到了三体系统中的Efimov态.讨论了在不同质量比的三体系统中出现Efimov态的条件.并由三体计算的结果分析了具有两个价中子的核系统在两体存在束缚态时可能存在的Efimov效应.

关键词: Efimov效应 , Faddeev方程 , 三体系统

STRAIN INDUCED PRECIPITATION OF Ti(V)N(C)IN HIGHCARBON STEEL

FANG Shufang , ZHANG Jian Panzhihua Institute of Iron and Steel Research , Panzhihua , China Laboratory of Physics , Panzhihua Institute of Iron and Steel Research , Dukou City , 617000 Sichuan , China

金属学报(英文版)

The precipitation of Ti(V)N(C)in high-carbon steel PD_3 during thermomechanicol treatment at austenitic temperatures after deformation has been observed.The average size of Ti(V)N(C)particles may reduce with the increase of strain and the decrease of thermomechanical treatment temperature,and vise versa.The growth of Ti(V)N(C)particles at 920°C is found to be controlled by the interface reaction between precipitated particles and matrix.

关键词: Ti(V)N(C) , null , null

V-N微合金化抗震钢筋铁素体中V(C,N)析出行为分析

吕煜坤 , 盛光敏 , 尹丽晶

材料工程 doi:10.11868/j.issn.1001-4381.2014.11.008

采用回火硬度法研究了两种不同V,N含量的抗震钢筋回火等温过程组织及显微硬度变化规律,根据J-M-A(Johnson-Mehl-Avrami)理论定量计算了V(C,N)在铁素体中的析出热动力学,并与实验所测PTT(析出-温度-时间)曲线进行对比.透射电镜下观察了V(C,N)沉淀析出规律.结果表明,由于大量弥散的第二相颗粒的作用,V-N微合金化钢筋(0.04V-0.0135N)的回火组织比V微合金化钢筋(0.076V-0.0055N)更加均匀细小.回火硬度法测得两种材料的PTT曲线与计算所得吻合,V微合金化钢筋呈“C”型且在670℃左右的鼻温区析出动力学加快,V-N微合金化钢筋是一单调曲线,这主要考虑N含量的影响.本次实验同时观察到纤维状碳化物,V(C,N)在过饱和铁素体中相间析出以及位错线析出,并就其形成机制进行讨论.

关键词: 析出 , V-N微合金钢 , 回火硬度法 , 碳氮化物 , 铁素体

高V钢中V(C,N)沉淀强化作用的研究

徐曼 , 孙新军 , 刘清友 , 董瀚 , 雍岐龙 , 黄金亮

钢铁钒钛 doi:10.3969/j.issn.1004-7638.2005.03.002

通过实验室轧钢试验,研究了三种高V钢轧制状态下的组织的和力学性能,并用透射电镜观察了V(C,N)析出的状况.结果表明,高V钢中可以获得单相的铁素体组织,并可以获得较高的强度,最高的屈服强度值达到525 MPa.对C3钢而言,由V(C,N)析出颗粒的沉淀强化造成的屈服强度增量最大可达244 MPa.透射电镜观察结果表明,高V钢中容易获得相间析出.试验获得的V(C,N)析出颗粒为4～10 nm,经计算分析,该尺寸在V(C,N)最大沉淀强化效果的范围.

关键词: 高V钢 , 单相铁素体组织 , 沉淀强化 , 相间析出

原位合成Fe-V(C,N)复合材料

杨廷贵 , 王一三 , 程凤军

钢铁钒钛 doi:10.3969/j.issn.1004-7638.2007.01.006

采用粉末冶金方法原位合成Fe-V(C,N)复合材料.应用SEM和XRD分析了复合材料显微组织和物相结构.发现在1200℃烧结时,活性的碳、氮原子降低了ó-(FeV)相的稳定性,生成了a-Fe相和均匀分布在基体中的V(C,N)颗粒.氮气的存在抑制了原位合成的V(C,N)颗粒在烧结后期的长大,最终V(C,N)颗粒尺寸在O.5～3μm之间,体积分数超过50%.在重负荷干滑动磨损试验中表现出很高的耐磨性.

关键词: 粉末冶金 , 原位合成 , Fe-V(C,N) , V(C,N) , 复合材料

MISCIBLE PRECIPITATES IN V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong ZHU Jing Central Iron and Steel Research Institute , Beijing , China ZHENG Yangzeng Professor , Department of Material Engineering , Yanshan University , Qinhuangdao , China

金属学报(英文版)

The characteristics and the formation of the miscible particles in V-Ti-N microalloyed steels were studied.It was found that the vanadium to form V-Ti miscible particles starts to precipi- tate after pouring and cooling to temperature below 11 50℃ by means of the epitaxial precipi- tation on the pre-existing titanium nitrides.The vanadium content in the particles is markedly influenced by the cooling rate after solidification.

关键词: microalloyed steel , null , null

ZnO/n-Si异质结的I-V、C-V特性研究

熊超 , 肖进 , 丁丽华 , 陈磊 , 袁洪春 , 徐安成 , 周详才 , 朱锡芳 , 潘雪涛

功能材料与器件学报

本文通过磁控溅射Al掺杂的ZnO陶瓷靶,在n-Si片上沉积n型电导的ZnO薄膜而制备的ZnO/n-Si异质结,并通过测试其光照下的I-V、C-V特性对其光电特性以及载流子输运特性与导电机理进行了研究.研究表明ZnO/n-Si异质结存在良好的整流特性与光电响应,可以广泛应用在光电探测和太阳能电池等领域.由于在ZnO/n-Si异质结界面处的导带补偿与价带补偿相差太大的缘故,在正向电压超过0.8V时,导电机理为空间电荷限制电流导电.同时研究表明ZnO/n-Si异质结界面存在大量界面态,可以通过减小界面态可以进一步提高其光电特性.

关键词: ZnO/n-Si异质结 , I-V特性 , C-V特性 , 内建电势 , 界面态

GRAIN COARSENING BEHAVIOR OF V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong , ZHU Jing Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China TANG Guoyi , Dept.of Graduates , Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing 100081 , China

金属学报(英文版)

The effects of chemical composition and cooling rate after solidication on the grain coarsening temperature,T_(GC),of the V-Ti-N microalloyed steels have been investigated.It is shown that the T_(GC) may be obviously raised by adding even a little Ti to the base steel so as to pre- cipitate a great deal of fine Ti-bearing particles of about 10 nm.The T_(GC) does not increase with the cooling rate,as it is over a certain critical value.The T_(GC) is insensitive to any varia- tion of N content at simulated cooling condition of 150 mm continuous cast slab.The T_(GC) may be dropped down about 100℃ by adding 0.33 wt-%Mo to the steels.The sensitivi- ty of T_(GC) to cooling condition relates to the Ti and V contents.

关键词: microalloyed steel , null , null