材料期刊网

Fe—Cu—Si—B纳米晶合金结构的研究

刘学东 , 朱洁 , 姜健 , 丁炳哲 , 王景唐

金属学报

利用X射线衍射、透射电镜及Mossbauer谱技术研究了Fe—Cu-Si-B纳米晶合金的相组成、析出相形貌、电子结构以及类金属原子的分布

关键词: 纳米晶合金 , Mossbauer spectroscopy

合金元素及碳在Fe-Mn-Cr-C合金中的不均匀分布对γ→α′转变的影响

郑炀曾 , 张福成

金属学报

用内转换Mossbauer谱分析了Fe-Mn-Cr-C合金冷变形前后合金元素原子与碳原子的不均匀分布和相组成。发现该合金在固溶处理状态时为两类奥氏体,即无碳奥氏体和含碳奥氏体;经变形诱发出不含碳与合金元素的无碳马氏体(类α-Fe)及含碳与合金元素的合金马氏体。理论计算和试验证实:该合金中奥氏体向马氏体转变是受奥氏体晶胞内共价键中共用电子对的数目(n_A值)大小所控制。合金元素原子与碳原子之间形成结合力较强的C-M_e共价键,这对合金马氏体的形成具有强烈的阻碍作用。

关键词: 固溶体的不均匀性 , solid solution , Mossbauer spectroscopy , strain induced martensite

非晶态合金Fe_(71)Ni_(10)B_(13)Si_4C_2磁各向异性的Mssbauer谱研究

徐祖雄 , 马如璋 , 韩永柱

金属学报

本文研究了Fe_(71)Ni_(10)B_(13)Si_4C_2非晶态合金在磁场退火时的反常磁各向异性变化。结果表明,在430℃磁场热处理时优先发生了表面晶化现象,导致垂直磁各向异性的反常增大。磁矩取向的择优性取决于压应力引起的和磁场热处理感生的两种磁各向异性。

关键词: 磁各向异性 , amorphous alloy , Mossbauer spectroscopy

40CrNiMo钢淬火组织的Mssbauer谱研究

徐祖雄 , 马如璋 , 朱永全 , 赵钟涛 , 冯永荣

金属学报

用室温透射Mossbauer谱研究了不同条件下淬火处理对钢中马氏体基体组织、残留奥氏体量和其含碳量的影响规律,阐明了高温直接淬火和形变淬火处理提高强韧性的效果与残留奥氏体量无明显关系。

关键词: 40CrNiMo钢 , retained austenite , Mossbauer spectroscopy

Microstructure and magnetic properties of Fe-Co-Nd-Y-B alloys obtained by suction casting method

稀土学报(英文版) doi:10.1016/S1002-0721(08)60315-4

关键词:

MOSSBAUER STUDY ON MAGNETIC ANISOTROPY OF AMORPHOUS ALLOY Fe_(71)Ni_(10)B_(13)Si_4C_2

XU Zuxiong MA Ruzhang University of Science and Technology Beijing , Beijing , ChinaHAN Yongzhu Beijing Institute of Metallurgy , Beijing , China

金属学报(英文版)

Magnetic anisotropies of the amorphous alloy Fe_(71)Ni_(10)B_(13)Si_(14)C_2 annealed in magnetic field have been studied using Mossbauer spectroscopy and X-ray diffraction.It is shown that the distribution of moments in the annealed sample are determined by both stress-produced and thermomagnetic treatment-induced magnetic anisotropies.

关键词: magnetic anisotropy , null , null

CRYSTAL STRUCTURE OF γ-Li_xFe_2O_3 WITH ELECTROCHEMICAL INSERTION OF Li

HUANG Jianshun CHEN Junming Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , China Research Associate , Shanghai Institute of Metallurgy , Academia Sinica , Shanghai 200050 , China

金属学报(英文版)

Crystal structure of γ-Li_xFe_2O_3,inserted Li electrochemically,was studied by Moss- bauer spectroscopy together with X-ray diffraction,XPS and electrochemical method,On the insertion of Li at low current density,the crystal structure is keeping original spinel; while at higher current density or by thermal activation,owing to violent movement of Li~+ ions,part of crystal structure transforms into rock type similar to face-centered cubic structure of ferrous oxide.The transition channels during insertion of Li~+ ions and limitation of Li~+ ions inserted were discussed.

关键词: null , null , null