DISSOLUTION EQUILIBRIUM OF Mg VAPOUR IN LIQUID Fe

The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem-perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con-stant for the reaction Mg_((g))=[Mg]and the free energy of solution obtained are:K=a_(Mg)/P_(Mg)=0.0236ΔG°(wt-%)=58300 J/mol     

DISSOLUTION EQUILIBRIUM OF Mg VAPOUR IN LIQUID Fe

The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_(g)=[Mg] and the free energy of solution obtained are: K=a_(Mg)/P_(Mg)=0.0236 △G°(wt-%)=58300 J/mol     

纯Fe液中Mg的溶解平衡研究SCIEI

本文应用蒸汽压法,在双温带炉中,研究了1600℃下Mg蒸汽在纯Fe液中的溶解平衡,1600℃下溶解平衡常数及标准溶解自由能分别为: K=α_(Mg)/P_(Mg)=0.0236 ΔG°(wt-%)=58300(J/mol)     

Mn和Mg对Al-5Fe合金初生Al3Fe相形貌的影响

Mn和Mg添加到Al-5Fe(质量分数，％，下同)合金中，初生Al3Fe相的形貌发生明显变化．未加入合金元素时，该合金中的初生Al3Fe相长成粗大的针片状；加入2．5％Mn和0．1％Mg(质量分数，下同)后，粗大的初生富铁相消失，取而代之的是细小针状、粒状和花朵状；加入2．5％Mn和1．5％Mg，合金中的富铁相大部分转变为粒状和穗状(分叉状)两种．探讨了粒状和穗状的形成机理．对合金力学性能的测试表明，加入Mn和Mg后，合金的抗拉强度得到了不同程度的提高：Al～5Fe合金为107MPa，Al-5Fe-2．5Mn-0．1Mg合金为139MPa，Al-5Fle-2．5Mn-1．5Mg合金为122MPa，增长幅度分别为29．9％和14％．     

火焰原子吸收法测定铝土矿中的Fe、Mn、Ca、Mg

探讨了用火焰原子吸收法测定铝土矿中的Fe、Mn、Ca、Mg的分析方法及干扰情况。用高氯酸、硝酸混合酸分解试样，氢氟酸去硅。相对于碱熔法分解试样，极大地降低了试液中的离子浓度，有利于原子吸收法测量。又使操作简化方便省力，缩短了试样分解时间。通过试验发现，样品中的Fe、Mg受基体铝的干扰，加入氯化媳及EDTA后。干扰可被消除。分析试样表明：本法具有较高的分析准确度和精密度，操作简单快速，为氧化铝生产提供了快速可靠的分析方法。     

Decorating Mg/Fe oxide nanotubes with nitrogen-doped carbon nanotubes

Mg/Fe oxide nanotubes decorated with nitrogen-doped carbon nanotubes (CN_x) were fabricated by catalytic chemical vapor deposition of ethylenediamine on the outer surface of oxide nanotubes. Mg/Fe oxide nanotubes were prepared using a 3:1 molar precursor solution of Mg(NO₃)₂ and Fe(NO₃)₃ and anodic aluminum oxide as the substrate. The obtained samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM). The XRD pattern shows that the oxide nanotubes are made up of MgO and Fe₂O₃. TEM and SEM observations indicate the oxide nanotubes are arrayed roughly parallel to each other, and the outer surface of oxide nanotubes are decorated with CN_x. XPS results show the nitrogen-doped level in CN_x is about 7.3 at.%. Magnetic measurements with VSM demonstrate the saturated magnetization, remanence and coercivity of oxide nanotubes are obvious improved after being decorated with CN_x.     

Mg-X(X=Fe,Co)贮氢合金的氢化燃烧合成

有望获得实用化的镁系贮氢合金之中 ,Ｍｇ Ｆｅ系的理论吸氢量为 5 5% (质量 )、Ｍｇ Ｃｏ系的理论贮氢量为 4 5% (质量 )都是非常高的 ,但是目前尚未开发成功一种稳定高效生产方法。为寻求工业可行的生产这种贮氢合金的方法 ,日本东北大学新材料研究所采用差示扫描量热计 (ＤＳＣ)和Ｘ射线衍射装置 (ＸＲＤ)研究了Ｍｇ Ｘ(Ｘ =Ｆｅ ,Ｃｏ)系贮氢合金的氢化燃烧合成。研究用的试样是由金属粉末按Ｍｇ∶Ｆｅ(或Ｃｏ) =2∶1的摩尔 (ｍｏｌ)比秤量后 ,投入丙酮液中用均化混合器进行混合均匀的混合物。于室温下将该试样搅拌 3 6ｋｓ。混合物置…     

Microstructure,corrosion behavior,and surface mechanical properties of Fe oxide coatings on biomedical ZK60 Mg alloy

The Mg‐5.5Zn‐0.6Zr (in wt%, ZK60) alloy has been surface modified by dual Fe&O ion implantation and deposition (II&D) under different O₂ fluxes from 0 to 40 sccm. The microstructure is investigated by glancing angle X‐ray diffraction, atomic force microscope, and scanning electron microscopy. The results show that the modified layers, with a gradient microstructure of outer deposition region and inner implantation region, are composed of α‐Fe + Fe&Mg mixture, FeO/Fe‐rich oxide + Fe&Mg mixture, and α‐Fe₂O₃/Fe‐rich oxide + Fe&Mg mixture for 0, 10, and 40 sccm O₂ fluxes, respectively. The electrochemical and immersion tests in 37°C Hank's solution indicate an improvement in corrosion behavior under 0 and 10 sccm O₂ fluxes, but a deterioration in corrosion resistance under 40 sccm O₂ flux. In addition, the nanoindentation tests suggest that the dual Fe&O II&D simultaneously enhances the surface hardness and elastic modulus due to the formation of Fe and its oxide coatings.     

FAAS法连续测定镍氢蓄电池材料用铂黑中的微量铜铁镁锰锌

建立了FAAS法连续测定镍氢蓄电池材料用铂黑中微量Cu、Fe、Mg、Mn和Zn的方法,试验了检出限、燃烧器高度、灯电流、光谱通带宽、共存离子干扰现象、酸性介质等条件。方法灵敏度高、重现性好、干扰小、步骤简单,操作容易掌握。测定Cu、Fe、Mg、Mn和Zn的质量分数的相对标准偏差均小于1.0%。标准加入回收率均在97.0%~102.0%,结果与认定值相符。方法适用于铂黑的生产现场控制分析和样品系统分析。     

ZL108合金高温强度与化学成分的关系

用正交试验法探讨了Cu，Mg，Mn，Fe诸元素对ZL108合金的热强作用。采用多元回归定量地建立了4元素及其交互作用与合金300℃短时抗拉强度之间的经验公式。该回归方程具有较高的置信度，根据化学成分计算出的合金高温抗拉强度与实测结果误差在5％以内。讨论了4元素的热强机理。各元素通过所形成的复杂金属问化合物的热稳定性、形态以及数量实现对合金的热强作用。Mg和Fe显著提高合金的高温强度，但Mg量增至0．7％以上，其热强作用不再明显。Fe量高时，Mn出现热强作用。Mn量高时，Cu只具有微弱的热强作用。最后提出Cu，Mg，Mn，Fe的最佳范围可以保证合金高温抗拉强度超过国家标准(78．5MPa)。     

用Ga取代部分Fe对R3（Fe,Mo）29结构及磁性的影响

详细研究了Ｇａ取代Ｒ３（Ｆｅ,Ｍｏ）２９（Ｒ＝Ｓｍ,Ｙ）（Ｇａ＜０．１５）中的部分Ｆｅ对其结构和内禀磁性的影响,包括不同的Ｇａ取代对Ｒ３（Ｆｅ,Ｍｏ）２９化合物的晶胞常数、居里温度、饱和磁化强度、磁晶各向异性的影响。结果表明：在Ｒ３（Ｆｅ,Ｍｏ,Ｇａ）２９化合物中,随着Ｇａ含量的增加,晶胞体积膨胀,居里温度升高,饱和磁化强度下降,Ｆｅ原子的平均磁矩降低,Ｓｍ３（Ｆｅ０．９６６－ｘＭｏ０．０３４Ｇａｘ）２９化合物的各向异性由平面向锥面结构转变,继续增加Ｇａ含量,有可能出现单轴各向异性。     

ICP-MS法测定氢氧化钽中Mg,Fe,Cr,Zn 4种杂质

研究了直接采用ICP—MS的等离子体屏蔽技术（PS）测定高纯氢氧化钽中Mg，Fe，Cr，Zn4种杂质元素的分析方法。实验了的仪器工作参数，用Co做内标补偿基体效应，方法的回收率在80％-130％之间，相对标准偏差均低于18．40％，检出限为0．01ng／ml-0．56ng／ml，测定结果与ICP-AES测定结果基本一致。     

粉末热压新型(Al63Cu25Fe12)p/Mg复合材料的研究

采用粉末热压方法,制备了新型（Al63Cu25Fe12）p/Mg复合材料,Al63Cu25Fe12准晶颗粒均匀分散在复合材料中,而且与基体金属的结合良好,反应轻微,只在颗粒的边沿部分存在约5μm的反应层.粉末热压复合过程中的较低温度限制或减缓了准晶颗粒与基体金属之间的反应,反应层的反应产物除了准晶类似相Al13Fe4外,还存在一定的MgAl2O4氧化物.与纯Mg相比,除塑性外的其它力学性能指标均有很大提高,特别是含10%准晶颗粒的复合材料,其屈服强度显著提高到193.28MPa.     

铝、铜、镁对铸态锌基合金组织和阻尼性能的影响

研究了铝、铜、镁等合金化元素对铸态锌基合金组织和室温下阻尼性能的影响, 利用悬臂梁法测试了合金的阻尼性能。结果表明, 锌铝二元合金随铝含量增加, 初生α相增多, 共晶体逐渐减少直至消失。镁、铜等合金元素对Ｚｎ２７ ％ Ａｌ 合金α相的大小和分布无大的影响。镁、铜可固溶于基体中, 当其含量较高时, 分别在组织中形成ＭｇＺｎ２ 化合物和ＣｕＺｎ５ 化合物, 分布于晶界。铝含量在６ ％ ～６０ ％ 范围内的锌铝合金在铸态下均具有高的阻尼能力; 铜、镁等合金化元素的加入降低了Ｚｎ２７ ％ Ａｌ合金的阻尼性能。ＺｎＡｌ 系合金的高的阻尼性能是在外部的交变应力作用下, 晶界和相界间的粘滞性滑动以及α相发生局部的微塑性变形, 使振动能量得以消耗而造成的     

Fe含量对快凝铝铁合金凝固过程的影响

用热力学及非平衡动力学理论研究了Ｆｅ含量对快速凝固铝铁高温合金的显微组织及快凝过程的影响机制。结果表明：随着铁含量的增加，快凝条带中的微胞晶区（ＺｏｎｅＡ）体积分数呈下降趋势；由于合金中存在初生相，从动力学上减弱了合金的过冷及凝固速度。     

Al—Mg—Sc合金的再结晶

采用硬度、金相和透射电镜等分析测试手段研究了一种ＡｌＭｇＳｃ合金的再结晶温度和再结晶形核机制。结果表明：合金的再结晶起始温度为３７５℃,终了温度为５２０℃;合金再结晶温度高的原因是细小弥散的Ａｌ３Ｓｃ质点对位错和亚晶界的钉扎作用;合金的再结晶形核机制为亚晶合并和亚晶长大的双重作用。     

Development of hydrogen-storage alloys by mechanical alloying of Mg with Fe and Co

The hydriding and dehydriding kinetics of Mg are reviewed. In order to improve the reaction kinetics of Mg with hydrogen, mechanically-alloyed Mg-10 wt.%Fe and Mg-10 wt.%Co mixtures are prepared and their hydrogen-storage properties are investigated. The activation of Mg-10 wt.%Fe is easier than that of Mg-10 wt.%Co. However, The hydriding rates (at 569–589 K, 7–11 bar H₂) and dehydriding rates (at 589 K, 1.0 bar H₂) of the mechanically-alloyed Mg-10wt.%Co are higher than those of the mechanically-alloyed Mg-10 wt.%Fe after activation. The H_a value of Mg-10 wt.%Co after 60 min is 3.08 wt.% at 589 K under 11 bar H₂ and its H_d value after 60 min is 1.48 wt.% at 589 K under 1.0 bar H₂. Mg-10 wt.%Co has a smaller particle size than has Mg-10 wt.%Fe after hydriding and dehydriding cycling. The mechanical alloying of Mg with Fe and Co and the hydriding-dehydriding cycling increased the hydriding and dehydriding rates by facilitating nucleation (by creating defects on the surface of the Mg particle and by the additive) and by shortening the diffusion distances (by reducing the Mg particle sizes).     

EQUILIBRIA OF Sr,Ba AND O,S IN LIQUID Fe

The equilibrium constants between Sr-O,Ba-O and Sr-S,Ba-S in liquid iron at 1570℃ and the interaction coefficients concerning these elements have been determined as follows: K_(Sro)=1.897×10~(-7),e_O~(Sr)=-43.8 K_(BaO)=8.204×10~(-8),e_O~(Ba)=-98.0 K_(SrS)=8.356×10~(-7),e_S~(Sr)=-3.9 K_(BaS)=4.083×10~(-7),e_S~(Ba)=-3.5