固溶处理对AZ91D镁合金挤压管件组织和性能影响

研究了不同状态坯料及热处理工艺对挤压成形AZ91D合金管件组织性能的影响。结果表明，坯料的各种预处理状态对待压成形管件的组织和力学性能均有不同程度的影响，无论镁锭经过什么预处理，挤压成形的管件经固溶处理后．水冷的力学性能要高于空冷的力学性能；而经固溶加时效处理后则相反，水冷时效之后的力学性能普遍比经过空冷时效的力学性能低。     

Development of compositionally modulated multilayer Zn-Ni deposits as replacement for cadmium

Compositionally modulated multilayer (CMM) Zn-Ni deposits were electrodeposited from single acidic bath (pH = 4.7) by using a potentiostatic sequence. The Zn and Ni composition in the alloy was tailored as a function of distance from the steel substrate. X-ray diffraction studies of the deposit showed the presence of γ-phase with a composition of Ni₅Zn₂₁. The corrosion properties of modulated multilayer coatings were studied in 5% NaCl solution using electrochemical corrosion techniques. The polarization resistance of the deposits varied as a function of Ni content between 1700 and 3440 Ω. CMM Zn-Ni with 20 wt% Ni exposed in ASTM B117 salt spray test did not show any red rust formation after 400 h.     

高压缸液态挤压成形压力的分析及计算

采用液态挤压代替压力铸造生产铝合金高压缸，不仅克服了压铸件内部易形成气孔和氧化夹杂物的缺陷，而且提高了成品率，降低了产品成本，在分析了高压缸液态挤压成形过程的基础上，提出了成形压力计算的简化模型，并采用变形功法推导了成形压力计算公式，得到了适合实际应用的结果。     

铝箔表面反光特性与轧制润滑条件关系的探讨

铝箔表面的反光率是轧辊表面状态的反映，铝箔表面反光率差和铝箔表面反光率比与轧制的润滑条件密切相关。重点讨论了它们之间的关系。     

CSP线Q235变形规律及微观组织实验研究

借助Gleeble-1500热模拟机,研究了Q235钢不同温度、不同变形量及不同变形速率等参数对变形抗力及组织的影响规律,为生产实践提供了参考。     

Oxidation-sulfidation behavior of Ni aluminide in oxygen-sulfur mixed-gas atmospheres

Oxidation-sulfidation studies were conducted on sheet samples of nickel aluminide, containing 23.5 at. % Al, 0.5 at. % Hf, and 0.2 at. % B in an annealed condition and after preoxidation treatments. Continuous weight-change measurements were made by a thermogravimetric technique in exposure atmospheres of air, a low- gas mixture, and low- gas mixtures with several levels of sulfur. Detailed scanning electron microscopy (SEM), X-ray, and electron microprobe analyses of the corrosion product scale layers were performed. The air-exposed specimens developed predominantly nickel oxide; the specimen exposed to a low- .     

High-rate capability of spinel LiNi0.05Mn1.95O4 cathode for Li-ion batteries prepared via coprecipitated precursor

Spinel LiNi0.05Mn1.95O4 cathode material for lithium ion batteries was synthesized by solid-state reaction from coprecipitated Ni-Mn hydroxide precursors and characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and galvanostatic charge-discharge tests. It is found that LiNi0.05Mn1.95O4 powder has an ordered cubic spinel phase （space group Fd3m） and exhibits superior rate capability. After 450 cycles, the LiNi0.05Mn1.95O4/carbonaceous mesophase spheres（CMS） Li-ion batteries can retain 96.0% and 93.3% capacity at 5C and 10C charge/discharge rate, respectively, compared with 85.3% （5C） and 80.5% （10C） retention for LiMn204 batteries. However, the initial discharge capacity of LiNi0.05Mn1.95O4/CMS batteries at 1C charge/discharge rate （96.20 mA.h/g） is slightly lower than that of the LiMn2O4 batteries （100.98 mA.h/g） due to the increased average oxidation state of Mn inLiNi0.05Mn1.95O4.     

直齿轮精密塑性成形时齿面裂纹的产生机理及控制方法

本文通过对内齿轮缩挤成形工艺的有限元模拟 ,分析了直齿轮成形时齿面裂纹的产生机理 ,并从理论上进行了解释 ,进而提出了防止齿面裂纹产生的方法     

Formation and crystallization of bulk Pd_(82)Si_(18) amorphous alloys

1　INTRODUCTIONMetallicglassisregardedasastatethatisofdis orderunlikecrystalalloyswith periodicatomstruc ture.Soitshowsexcellentcapabilitiesofsoftmag netism ,mechanics ,corrosionresistance ,etc .How ever ,mostofamorphousalloyswereproducedbyus ingrapidsolidificationmethodssuchassplatquench ing ,meltspinning ,andsoon ,withcharacteristiccoolingratesof 10 4 10 6 K/s .Becauseamorphousal loysarepreparedwithsilk ,powderandribbon ,itisgreatlylimitedinengineeringapplication .Recently ,severalbulk…     

残余奥氏体对20Mn2SiVB钢的疲劳裂纹扩展的影响

研究了残余奥氏体对20Mn2SiVB钢疲劳裂纹扩展的影响。结果表明,在贝氏体铁索体中有残余奥氏体膜的存在,残余奥氏体膜可起到提高断裂韧性的作用;在应力强度因子较高的范围内,疲劳裂纹扩展速率受钢的断裂韧性影响,断裂韧性高,裂纹扩展速率低。