An electrochemical method for the preparation of Mg–Li alloys at low temperature molten salt system

Mg–Li alloys have been prepared by electrolysis in a molten salt electrolyte of 50% LiCl–50% KCl (mass%) at low temperature of 420–510 °C. The effects of electrolytic temperature and cathodic current density on alloy formation rate and current efficiency were studied. For the deposition of metallic lithium on the cathode consisting of solid Mg and liquid Mg–Li, both electrolytic temperature and cathodic current density have no obvious influence on current efficiency; while for the deposition of metallic lithium on the solid magnesium cathode, both electrolytic temperature and cathodic current density greatly affect alloy formation rate and current efficiency. The optimum electrolysis condition is—molten salt mixture, LiCl:KCl = 1:1 (mass%), electrolytic temperature: 480 °C, cathode current density: 1.13 A cm⁻². Mg–Li alloys with low lithium content (about 25 wt% Li) were prepared via electrolysis at low temperature following by thermal treatment at higher temperature.     

电生亚铜离子库仑滴定Ru（IV）

在含有ＣｕＳＯ４的ＨＣｌ溶液中，利用电生的ＣｕＣｌ对Ｒｕ（ＩＶ）做库仑滴定，获得毫克量钉转化成单一ＲｕＣｌ的最佳途径，结果具有较高的准确度和精度。同时还研究了钌的存在价态和状态。     

铝合金熔体旋转喷吹除气净化过程模拟

采用计算机模拟方法对铝合金熔体旋转喷吹除气净化过程的温度场以及流场进行分析。结果表明,在转杆内部放置一个导气管,可以显著降低气体温度,从而可以有效地解决旋转喷头由于熔剂因高温变软而堵塞的问题;旋转速度和进气流量对铝合金熔体旋转喷吹除气净化效果具有重要影响,应该根据具体情况选择合适的工艺参数。熔池为方形结构时,气体主要从对角处出去,而远离对角处的体积分数却显著降低,甚至可能发生吸气。     

低熔点Cu-P基中间合金及其变质效果

利用差示扫描量热仪(DSC)、扫描电子显微镜(SEM)和金相显微镜等手段对Cu-P基中间合金进行了研究。结果表明，在二元共晶Cu-P中间合金中加入一定量的Sn可制成低熔点的Cu-16Sn-8P中间合金；在此基础上研制出一种熔点为630℃左右的低熔点的多元Cu-P基中间合金。与Cu-P中间合金相比，该低熔点多元Cu-P基中间合金对过共晶AI-24Si合金具有更好的变质效果。同时，该中间合金对ZL109合金也具有良好的变质效果。     

ICP－AES法测定Pt－Ni和Pd－Ni合金中的镍及杂质元素

采用溶液试样的ＩＣｐ－ＡＥＳ法，测定Ｐｔ－Ｎｉ、Ｐｄ－Ｎｉ合金中的Ｎｉ和１６个杂质元素。标准中不配入Ｐｔ、Ｐｄ。其对待测元素的影响是用等效浓度差减法校正；Ｎｉ对部分待测元素的影响是用扣除其空白强度的方法校正。     

TiAl基合金与陶瓷界面反应的研究

借助电子探针微区分析仪、维氏显微硬度计、光学和电子显微镜对TiAl合金与Al2O3,ZrO2以及经CaO稳定的ZrO23种陶瓷型壳的界面反应进行了研究分析。结果表明，这3种材料的化学稳定性依次升高，而经CaO稳定的ZrO2型壳与TiAl反应层的厚度仅为50μm,故可望用作钛铝合金精密铸造型壳面层材料。     

Corrosion rate of magnesium and its alloys in buffered chloride solutions

The effect of the buffer capacity of test solution on the corrosion rate of cast pure (>99.95 mass%) and high-purity (>99.9999 mass%) magnesium, and AZ31 and AZ91E has been studied. Their corrosion rates were measured gravimetrically in a pH 6.5 and a pH 9 borate buffer including chloride ions, and in a conventional chloride solution. Except for the AZ91E in the pH 6.5, the corrosion rates of all the examined materials depended solely on the pH of the test solution, although the materials had a variety of purity and alloying elements. Higher buffer capacity probably masked the detrimental effect of the “cathodic impurities”. The corrosion rates measured in the buffers were considered as giving the resistivity of the passive film to anodic reactions. The high-purity magnesium had a fair corrosion resistance even in conventional chloride solution.     

铝合金车轮铸造模具CAD/CAE技术的应用

随着计算机应用技术的发展，CAD/CAE技术已广泛应用于各行各业的设计，主要介绍了铝合金年轮铸造模具上应用CAD/CAE技术的成效。     

铸态AZ80镁合金高温热变形行为研究

在Gleeble-1500热模拟机上对铸态AZ80镁合金在应变速率为0.005s-1~5s-1、变形温度为200℃~400℃条件下的高温热压缩变形行为进行了研究。结果表明,材料真应力-真应变曲线呈现动态再结晶特征。在温度T≥250℃,试样流变应力行为对应变速率敏感;在低温下T=200℃,应变速率对流变应力影响不大。高温下试样流变应力符合幂指数函数关系,应力指数n为6,热变形激活能Q为220kJ/mol。在高应变速率条件下,试样在变形中的温升是应变量的函数。实验中,Zener-Hollomon参数值大的试样温升明显,而Zener-Hollomon值小的试样变形温度基本保持不变。     

钛合金冷坩埚电磁约束铸造工艺研究

针对液态下化学性质相对活泼的钛合金,采用冷坩埚技术对电磁约束铸造工艺过程进行了试验研究,考察了工艺条件对成形坯件表面质量和内部组织的影响.结果表明:试样抽拉速度变化对表面质量和宏观组织的影响明显,加热功率虽然对组织变化影响不大,但对表面质量影响较为显著.通过优化工艺,可以获得既有较光滑铸造表面又具有一次定向凝固组织的钛合金铸件.讨论了铸造过程裂纹和组织缺陷的形成机理,获得到了表面光滑无裂纹,宏观组织为柱状晶的钛合金大尺寸圆坯.