镁热还原K2ZrF6制备镁锆中间合金

在KCl、NaCl熔剂的保护下,液态Mg能够还原K2ZrF6.通过控制炉料配比、还原温度、还原时间,并用机械正反向交替搅拌,成功地解决了传统生产工艺中渣相与Mg-Zr中间合金难以分离、合金杂质含量偏高、合金成分偏析的难题,获得了高质量的Mg-Zr中间合金.     

真空碳热还原制备Mg-Sr合金的反应热力学

介绍了真空碳热还原制备Mg-Sr合金新思路,研究了其还原反应的反应式、吉布斯自由能及临界还原温度。结果表明,真空碳热还原MgO,SrO的混合物可以得到Mg-Sr合金;其他因素不变的情况下,还原反应吉布斯自由能随反应温度的提高而减小,随系统气压的降低而减小,随反应生成的Sr,Mg混合蒸气中Sr摩尔分数的减小而减小;反应温度的提高、系统气压的降低和Sr摩尔分数的减小均有利于还原反应的进行;当系统气压为10 Pa,Sr摩尔分数为0.1时,临界反应温度为1353 K;相同系统气压下,碳热还原制备Mg-Sr合金的临界反应温度低于真空碳热炼锶、炼镁的临界温度,反应更易于进行;常规真空硅热还原制备金属镁(皮江法)的反应温度1473 K,气压13.3 Pa下,无论反应生成的Sr,Mg混合蒸气中Mg,Sr相对比例如何,真空碳热还原制备Mg-Sr合金的反应均具备热力学可行性。     

专利名称：一种电解还原氧化锰制备Mg—Mn合金的方法

一种电解还原氧化锰制备Mg—Mn合金的制备方法,属于镁合金材料制备技术领域,其特征是：采用电解法将锰从锰化合物中析出形成合金,步骤包括：在电解槽中熔化Mg或金属Mg及其合金元素,获得镁熔体;配制电解质,其中锰化合物中锰元素的质量为金属镁熔体质量的0．2％～10％,卤化物重量为锰化合物重量的（0．5～5）倍,     

基于铝热还原制备FeV50渣中钒的赋存状态

通过渣金V-O平衡及VO-Al平衡理论研究,分析了铝热还原FeV50合金制备过程不同冶炼阶段对渣中钒赋存状态的影响,计算得到钒在渣中的热力学还原极限。通过不同物相分析手段,得到铝热还原FeV50合金制备过程实际渣中钒的稳定结构。研究结果表明:渣金共存时渣中钒的稳态为VO;出渣后VO与V_2O_3的稳定性与冶炼氧分压有关,其平衡氧分压为0.41 Pa,常压条件下,VO会进一步氧化。渣中钒含量随合金铝含量的增加而降低,当合金铝质量分数分别为8.0%和20.0%时,对应渣中理论钒质量分数分别为0.16%和0.10%。实际冶炼过程中,冷态刚玉渣中的钒除了已还原FeV_x初级合金之外,主要以类质同象的形式与镁、铝、铁等元素固溶形成Mg(Al,V)_2O_4和(Mn,Fe)V_2O_4复合尖晶石结构。     

还原扩散法直接制造ZrNi合金粉末的研究

对以Ｃａ作还原剂ＺｒＯ粉末和Ｎｉ粉末作原料，用还原扩散法直接制造ＺｒＮｉ合金粉末的过程进行了研究分析，发现Ｃａ不令是ＺｒＯ２的还原剂，而且Ｎｉ的溶剂和载体，在合金形成过程中，Ｎｉ通过在液体Ｃａ中溶解和扩散，到达被还原出出来的金属Ｚｒ表面，并与Ｚｒ合金化形成ＺｒＮｉ合金因此Ｃａ的添加量是过程的关键因素。     

用添加Ba、Mg的SiCaAlFe合金对不锈钢还原脱磷的研究

以316L不锈钢为还原脱磷对象,考察钙合金中加入钡、镁对还原脱磷、脱硫的影响.结果表明钙合金中添加钡、镁能提高了其还原脱磷和脱硫能力,但如果想得到较高的脱磷率,一方面合金中钙含量必须增加,从合金成本和实验结果分析,将合金中的钙的质量分数提高到15%～20%是可行的;另一方面增加还原脱磷剂的加入量.在还原脱磷过程中发现,SiAlBaCa未出现回磷现象,且其脱硫效果最好.     

铝液还原熔盐中ZrO_2制备纯铝锆母合金

研究了铝液还原熔盐中ZrO2制备铝锆母合金的新方法,考察了还原时间对合金中锆浓度的影响.结果表明,铝液还原熔盐中ZrO2法制备出的铝锆母合金不含有氧化锆和氧化铝夹杂,可制备出更纯净的铝锆母合金.扫描电镜和电子能谱分析结果表明,合金中的Zr主要以Al3Zr晶须形式存在.铝锆母合金中锆浓度随还原时间的延长而明显增加,当还原4 h后合金中锆质量百分含量为1.5%,基本达到上限值.     

真空铝热还原制备Mg-Sr中间合金及其微观组织分析

在0.08kPa的真空度下于1 300℃采用真空铝热还原氧化镁和氧化锶的混合物8h,自然冷却结晶后得到Mg-Sr中间合金,并采用XRD、OM、EDS等对其进行表征。结果表明,制备的Mg-Sr中间合金的微观组织不规则,主要物相为Mg17Sr2,锶的质量分数为28.42%。     

钛矿渣电热法制取钛硅合金时直流电作用的实验研究

本文研究了实验条件下钛矿渣直流电硅热法制取钛硅合金直流电对渣中ＴｉＯ２还原贫化的作用，研究表明：直流电所特有的电解还原和金属液滴电泳沉降对渣中ＴｉＯ２的还原及合金微粒的沉降均有促进作用，外加直流电可使渣中ＴｉＯ２贫化速度，合金中钛含量，合金收率得率，钛回收率升高，合金中硅含量，残渣中ＴｉＯ２含量降低，半工业性试验结果与此类似。     

高杂质钨粉矿的净化处理实验研究

对富含磷、硫、砷、铅、锡、铋的复杂结构的低品位钨矿粉进行火法还原净化除杂处理，得到了能用于钨铁合金冶炼使用的合格富钨渣和铋铅锡合金副产品。     

Achieving enhanced ductility in a dilute magnesium alloy through severe plastic deformation

Experiments were conducted to evaluate the utility of a new processing procedure developed for Mg-based alloys in which samples are subjected to a two-step processing route of extrusion followed by equal-channel angular pressing (designated as EX-ECAP). The experiments were conducted using a Mg-0.6 wt pct Zr alloy and, for comparison purposes, samples of pure Mg. It is shown that the potential for successfully using ECAP increases in both materials when adopting the EX-ECAP procedure. For the Mg-Zr alloy, the use of EX-ECAP produces a grain size of ∼1.4 μm when the pressing is undertaken at 573 K. By contrast, using EX-ECAP with pure Mg at 573 K produces a grain size of ∼26 μm. Tensile testing of the Mg-Zr alloy at 523 and 573 K after processing by EX-ECAP revealed the occurrence of significantly enhanced ductilities with maximum elongations of ∼300 to 400 pct.     

Effect of Scandium on Corrosion Resistance of Welded Joint of Al-6Mg-Zr Alloy

Al Mgalloyshavebeenwidelyusedinmanyin dustries,especiallyinmarineandaircraftapplica tions,duetotheirgoodweldability,ductilityandex cellentcorrosionresistance.Beingthenon heattreat ablealloys,thesematerialsderivetheirstrengthpri marilyfromsolidsolutio…     

Microbiologically Induced Corrosion Action on Al-6Mg-Zr and Al-6Mg-Zr-Sc

The corrosion behaviors of Al-6Mg-Zr and Al-6Mg-Zr-Sc in sulfate-reducing bacteria（SRB） solution in the anaerobic environment were studied by electrochemical, microbiology and surface analysis methods. It is found that the oxide film is more compact resulting in the open circuit potential shifting about 100 mV positively due to the addition of Sc. On the other hand, it is demonstrated that pitting sensitivity of Al-6Mg-Zr-Sc alloy in the SRB solution is decreased and its microbiologically influenced corrosion resistance is improved.     

1420铝锂合金冷轧薄板生产工艺研究

研究了1420铝锂合金冷轧薄板的生产工艺制度。分析探讨了中间热处理对具有强烈加工硬化倾向的铝锂合金的影响以及该合金板材的道次压下量与终轧总压下量对板材综合力学性能及成品率的影响。     

Grain refinement of Mg-3Y alloy using Mg-10Al_2Y master alloy

The as-extruded Mg-10 Al_2 Y master alloy was chosen as a novel grain refiner for as-cast Mg-3 Y alloy.Contrast samples of cast Mg-3 Y alloy added with pure Al and Mg-Zr master alloy grain refiners were prepared under the same conditions.In this study,the influence of addition amounts of Al_2 Y and holding time on grain refinement efficiency as well as tensile properties was investigated.And the grain refining ability of the Al_2 Y particles was systematically evaluated in terms of the addition amounts,number density of the Al_2 Y particles and holding time.The finest grains are achieved at 2 wt% Al_2 Y addition amount,which corresponds to number density of the polygonal Al_2 Y particles of 420-460 mm~(-2).The Mg-10 Al_2 Y master alloy has significant refinement performance and no refining recession occurs at the holding time within 60 min,or the settling time up to 180 min.Grain refinement and the second phase strengthening of uniformly distributed Al_2 Y particles contribute to the simultaneous enhancement on both strength and elongation of Mg-3 Y alloy.     

Study of Microbiologicaily Induced Corrosion Action on Al-6Mg-Zr and Al-6Mg-Zr-Sc

The corrosion behaviors of Al-6Mg-Zr and Al-6Mg-Zr-Sc in the sulfate-reducing bacteria （SRB） solution in anaerobic environment were studied using electrochemical, microbiological, and surface analysis methods. It was found that the oxide film was more compact owing to the addition of Sc resulting in the open circuit potential shifting by about 100mV positively. On the other hand, it was seen that the pitting sensitivity of Al-6Mg-Zr-Sc alloy in SRB solution decreased and its microbiologically influenced corrosion resistance was improved. Pitting corrosion occurring on the surface of the two alloys under the comprehensive action of the metabolism of SRB was observed by SEM. It was obtained by EDS that the corrosion degree increased with time and corrosion was furthered by deposition of the product.     

坩埚冷却系统改造对中间合金熔炼的影响

以Zr-Sn—Fe—Cr—Ni合金为研究对象,通过2次非自耗真空电弧熔炼制备出中间合金,对熔炼中间合金时所采用的坩埚的冷却系统进行了改造,对比了改造前后中间合金的熔炼过程,并采用OM、EDS研究了中间合金的组织及化学成分,冉以添加中间合金扣方式压制电极,利用真空自耗电极熔炼方式制备出吨级锆合金铸锭,并对成品铸锭的成分进行跟踪。结果表明：在坩埚中加入导流槽后,中间合金的熔炼效率得到了提高,熔炼时难脱模现象大大缓解;采用加导流槽后的坩埚经过2次熔炼可以制备出成分均匀的中间合金,合金组织由柱状品和树枝晶组成,与未加导流槽时所熔炼的合金相比,组织及成分更加均匀;采用冷却系统改造后的坩埚熔炼的中间合金可以制备出成分均匀的工业规模级锆合会铸绽。     

STRUCTURAL AND MECHANICAL PROPERTIES OF SINTERED MAGNESIUM PRODUCTS AT ELEVATED TEMPERATURES

Abstract

The use of products sintered from pure magnesium or a magnesium alloy is envisaged for certain structural components in the field of nuclear technology. The mechanical properties at elevated temperatures (up to 525°C) of sintered compacts of oxidized Mg-Zr or Mg-MgO of various particle-size ranges (～20–800 μm) are discussed. Comparison of the tensile properties and of the values of the creep parameters in tension and compression emphasizes the direct dependence of the increase in mechanical strength at elevated temperatures on the content and distribution of the oxide and on the particle-size distribution of the oxidized powders. Metallographic examination of the various materials confirms these observations. The ductility varies with the size of the original particles.

Finally, data are presented for comparison on a material obtained by sintering magnesium-zirconium and magnesium-aluminium cuttings. In this case hardening occurs as a result of the formation of intermetallic compounds between the zirconium and the aluminium.     

用于铝合金晶粒细化的中间合金研究现状与分析

本文讨论了用于铝合金晶粒细化的中间合金研究与应用现状 ,在分析细化机理的基础上对新型细化剂AlTiB　　Re中间合金进行了初步探讨 ,结果表明 ,该中间合金是一种高效长久的晶粒细化剂 ,其效果优于进口的Al5TiB细化剂