添加微量稀土元素改善矿用硬质合金性能

此文研究了添加微量稀土元素对矿用硬质含金性能的影响。研究表明，添加一定量一定形态的稀土元素，能提高矿用硬质合会使用寿命，提高合金抗奇强度和抗冲击动性，增加合会的热塑性和高温强韧性，而对硬度、密度、磁力没有多大影响。     

Synergistic Extraction of Rare Earth Ions by 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone and Trioctylphousphine Oxide in Paraffin Wax

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稀土La对45Cr2NiMoVSi热作模具钢力学性能的影响

研究了稀土La对45Cr2NiMoVSi钢的强度、硬度、塑性和冲击韧度的影响。在相同的热处理工艺条件下,分别加入3种不同含量的稀土La,与不添加稀土La的45Cr2NiMoVSi钢的力学性能进行对比。结果表明：稀土La加入量在适当的范围内可显著提高45Cr2NiMoVSi的力学性能,稀土La加入量为0.20%（质量分数）时,45Cr2NiMoVSi钢可获得最好的综合力学性能。     

Ti-22Al-25Nb合金ISM熔炼过程中的成分控制

采用X荧光光谱(XRF)分析水冷铜坩埚真空感应炉熔炼(ISM)加入和不加入稀土Y的Ti-22Al-25Nb合金铸锭成分,分析结果表明,在保证获得成分均匀的合金铸锭的情况下,Al的挥发烧损在28.94%～33.88%之间;加入at为0.5%～1%Y,Y的挥发烧损在w为17.20%～34.26%;采取提高熔化温度降低保温时间的措施可以降低Al的挥发烧损.     

钕及固溶处理对AM60合金组织和力学性能的影响

研究了稀土钕的添加及固溶处理对AM60镁合金显微组织和常温力学性能的影响。结果表明:稀土Nd的加入能显著提高合金的抗拉强度σb、屈服强度σ0.2、伸长率δ。AM60合金中加入Nd后,与Al形成针状的稀土化合物Al11Nd3,使合金中的γ相Mg17Al12数量减少,合金组织得到细化。固溶处理(T4)后,-γMg17Al12相溶解,热稳定性较高的稀土化合物相并未溶解,使合金的抗拉强度进一步提高。AM60-1.5%Nd合金具有最好的显微组织和力学性能,但Nd加入量过高,反而使合金的性能降低。     

The YbNi2−xSn compound, a new structure type of ternary stannides

The crystal structure of the new ternary stannide YbNi_2−xSn [space group P6₃/mmc (N 194), z=4] was investigated using single crystal X-ray diffraction data (automatic single crystal diffractometers Philips PW1100 and Bruker SMART CCD, Mo K radiation). Three crystals with different composition YbNi_1.695Sn [a=4.424(4) Å, c=15.232(6) Å, V=258.2(4) ų, ρ=10.066 g cm⁻³, μ=57.32 mm⁻¹], YbNi_1.705Sn [a=4.424(5) Å, c=15.179(7) Å, V=257.3(4) ų, ρ=10.116 g cm⁻³, μ=57.59 mm⁻¹] and YbNi_1.745Sn [a=4.303(6) Å, c=16.001(9) Å, V=256.7(5) ų, ρ=10.199 g cm⁻³, μ=58.00 mm⁻¹] were refined to R=0.0494, wR²=0.1330, to R=0.0782, wR²=0.1916 and to R=0.0643, wR²=0.1460, respectively. The compounds belongs to a new structure type of intermetallic compounds and are formed from two hypothetical structures YbNi_1.5Sn (space group P6₃/mmc, z=4) and YbNi₂Sn (space group P6₃/mmc, z=4) containing segments of the MnCu₂Al, ZrBeSi and ZrPt₂Al structures.     

Thermal and structural properties of KPO3·Ln(PO3)3 glasses (Ln=rare earth ion)

Glass transition temperatures T_g and Raman spectra of KPO₃·Ln(PO₃)₃ (Ln=rare earth ion) glasses were measured for all rare earth members (except Pm). From the series behavior of the T_g and Raman data, it is concluded that the coordination number around rare earth ions changes, probably from nine to eight, in the middle of the rare earth series.     

含稀土耐蚀Mg-9Al铸造镁合金腐蚀行为研究

通过盐雾、失重及析氢等腐蚀试验研究了新研制的含稀土的Mg-9Al铸造镁合金AR091在3.5%NaCl溶液中的腐蚀行为,并与目前常用的ZM5和AZ91D镁合金的腐蚀行为进行了对比。结果表明,AR091具有良好的耐腐蚀性能。AR091的微观组织与AZ91有明显差别,其晶粒更为细小,β相明显减少,还存在许多针状含稀土元素(RE)的析出相。合金内各相间的微电偶腐蚀明显减弱,阴极反应过程受到抑制。采用场发射扫描电镜(FESEM)及俄歇电子谱(AES)研究比较了合金的表面腐蚀产物膜,结果表明,在AR091合金表面能形成更为致密、保护性更好的腐蚀产物膜。     

Low temperature thermoluminescence properties of Eu and R doped CaAl2O4

The thermoluminescence (TL) of calcium aluminate persistent luminescence materials doped with Eu²⁺ and co-doped with R³⁺ ions were studied between 20 and 325 K. The basic material, CaAl₂O₄:Eu²⁺, showed three TL bands between 150 and 300 K in the glow curve. Changing the R³⁺ co-dopant to the adjacent element in the rare earth series affects significantly the thermoluminescence intensity and even the position of the glow curve maximum. The physical effect seemed to be removing the traps since the La³⁺, Y³⁺, and Lu³⁺ ions suppressed the thermoluminescence. The Pr³⁺, Ho³⁺, and Dy³⁺ co-doping enhanced mainly the low temperature traps and these materials have an intense but relatively short persistent luminescence at room temperature. The Nd³⁺ and Tm³⁺ ions enhanced the TL bands close to room temperature and are thus the most suitable co-dopants to induce intense and long persistent luminescence. The quenching of the thermoluminescence by Sm³⁺ was concluded to be due to the presence of Sm²⁺ that removes totally the traps.     

富Y重稀土对ZM5合金组织和性能影响的研究

以ZM5镁合金为基体材料，以富Y重稀土为添加原料，应用铸造方法制备了稀土镁合金。利用光学金相显微镜（OM）、X衍射分析、拉伸试验和腐蚀试验等方法，考察分析了稀土Y对ZM5合金铸造组织结构、力学性能和腐蚀性能的影响。结果表明，铸态合金中出现了新相Al3La、MgY，它对于减少晶界处第2相的析出、晶粒的细化以及力学性能的提高起着积极作用。同时，稀土的加入明显地改善了合金的腐蚀性能。