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Null 包大杰1 (1.上海柴油机厂,上海,200432) 摘要: 问:何谓钢铁中全碳量(总碳量)和游离碳?答:碳在钢,铁中主要以化合状态和游离状态存在.在钢中主要以铁的碳化物如:Fe3C,Fe23C6等以及与某些合金元素的碳化物如:Mn3C,WC,TiC,MoC,VC,Cr3C2,Cr6C2等形式存在,统称为化合碳,钢中很少有游离碳.在铁中碳除以化合碳存在外,还以游离状态(石墨碳)存在,而且是主要形式.但是在白口铁中则多以碳化铁(Fe3C)形式存在. [全文内容正在添加中] ......
Mg2NiH4,同时还保留大量的非晶结构.循环伏安测试结果显示较明显的氧化峰和还原峰,且峰电位差较小,反映电极合金具有较好的吸放氢反应的可 逆性. 关键词:Mg-Ni-La系贮氢合金;微观结构;电化学性能;熔体快淬 中图分类号:TG 139.7 文献标识码:A Effects of melt-spinning velocity...-storage (Mg70.6Ni29.4)92La8 alloys were prepared by melt-spinning. The effects of velocities of cooling roll on the microstructures and electrochemical properties for the as-quenched ribbons were......
Cu-Cr体系的一些凝固规律和凝固参数. 关键词: CuCr合金; 凝固模拟; 快速凝固; 熔体快淬 中图分类号: TG146.1 文献标识码: A Numerical simulation of single roller melt-spinning for solidification process of Cu-Cr alloy WANG You-hong1, 2, SUN...: The numerical simulation model of single roller melt-spinning for solidification process of Cu-25%Cr alloy was built, and the vacuum chamber, cooling roller and sample were taken into account......
alloys were prepared by melt-spinning. The phase structures of the ribbons before and after charge/discharge cycling were characterized by X-ray diffractometry (XRD) and high-resolution transmission... has no significant change. Key words: Mg-Ni-La hydrogen-storage alloy; microstructure; electrochemical property; melt-spinning 镁基储氢合金理论储氢容量高达7.6%,电化学容量达1000 mA·h/g,拥有储氢量大,密度低,含量丰富和价格低廉等优点.近10年来,尽管镁基贮......
rate on phase transformation of Ni-Mn-Ga melt-spinning alloys GUO Shi-hai, ZHANG Yang-huan, WANG Guo-qing,QI Yan, QUAN Bai-yun, WANG Xin-lin (Functional Material Research Institute,Central Iron and Steel Research Institute, Beijing 100081, China) Abstract: Ni-Mn-Ga ribbons were prepared by melt-spinning technology. The effects of quenching rates on phase transformation of Ni-Mn-Ga melt......
; accepted 30 June 2006 Abstract: The preparation technology and magnetic properties of Nd9.5Fe77B6Co5Zr2.5 nanocomposite magnets were investigated by melt spinning and crystallization process. The nonuniform composition and grain size can be induced by nanocomposite magnet prepared by arc-melt-spinning process, which will decrease the magnetic properties. These can be avoided by modification......
> Abstract: Ribbons of amorphous Cu-Ti-Ni alloys were prepared by the melt spinning method. The amorphous structure of these ribbons was confirmed by X..., is smaller than 0.45. The glass forming ability(GFA) of Cu-Ti alloy is not effectively promoted by Ni addition. Key words: Cu-Ti-based alloys; glass-forming ability; melt-spinning method; deep eutectics......
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to recover the oxidized Nd-Fe-B phase. After washing the resultant powders to remove Ca metal component, the powders obtained were recycled as an isotropic magnetic powder by the melt spinning method... composition, i.e., the addition of Nd metal, at the melt spinning process improved the magnetic properties to be Br=~0.75 T, Hcj=~0.93 mA·m-1, and(BH)max=~91 kJ·m-3. The magnetic properties of the bonded......
Microstructure and Electrochemical Characteristics of Melt-Spinning Alloy Ml(NiCoMnAl)5 ZHAI Yu-chun1,CHEN Lian2,Tong Min2,WEN Ming-fen3,CHEN De-min2 (1.Department of Materials and Metallurgy... characteristics of Ml(NiCoMnAl)5 alloys prepared by both the melt-spinning method and the conventional induction melting were investigated and compared. SEM and XRD studies show that the microstructure of melt......