The prepared MgxCu0.3Zn0.7-xLayFe2-yO4 magnetic nanoparticles were used as a efficient, recoverable and heterogeneous catalyst for the one-pot synthesis of quinoxalines 3(a–g) and 1,5-benzodiazepines 5(a–h) under mild reaction conditions in good yields. The recyclability of catalyst was ...
Mg-6Zn—xCu铸造合金的显微组织及力学性能研究
Mg-Zn-Cu合金是一种新型的Mg-Zn系耐热镁合金,已成功商业化.但国内外仍偏重于该合金的开发应用,相关研究报道却非常少,且多集中在砂型铸造合金和变形合金的显微组织,合金相以及蠕变性能和耐蚀性能等方面,很少从半固态角度探讨该合金.本文采用金属型铸造方法成功制...
采用金属型铸造方法制备了Mg-6Zn-xCu(x=1%,3%,5%)镁合金,并通过光学显微镜,X射线衍射和扫描电镜及力学性能测试等手段研究了Cu含量对合金的显微组织和力学性能的影响.结果表明:Cu在合金中主要以CuMgZn相存在,且随着Cu量的增加,其数量增加;在凝固...
基于修正的Clyne-Davies热裂模型(CSC*),对Mg-6Zn-xCu-0.6Zr(x%=0,1%,2%,3%,质量分数)合金热裂倾向性进行预测;采用双电偶热分析法研究Mg-6Zn-xCu-0.6Zr合金凝固路径、凝固过程中的特征温度、枝晶干涉固相分数等。利用“T”型热裂模具测试系统采集Mg-6Zn-xCu-0.6Zr合金凝固收缩力随温度(或时间)的变化曲线...
In this work, the impact of extrusion and post-extrusion heat treatment (T6) on the microstructure and mechanical properties of the Al-1.2Mg-0.8Si-0.5Mn alloy with different Cu contents (0, 0.6, 1.3 and 2.0 wt%) was studied. Microstructure characterization showed that all extruded alloys exhi...
Cu含量对铸造Mg-3Zn-xCu-0.6Zr镁合金时效析出行为的影响
(3)通过晶间腐蚀,剥落腐蚀和电化学腐蚀试验,分析了Cu含量对T6态Al-10Zn-2.6Mg-xCu-0.15Zr合金耐腐蚀性能的影响.结果表明:在0～1 wt.%范围内,随着Cu含量升高,合金耐腐蚀性能降低,在1～1.5 wt.%范围内,合金的耐腐蚀性能有所提升,但依然低于零Cu合金,随着Cu含量在1.5～3 wt.%范围内继续升高,合金耐腐蚀整体...
A systematic study of the intergranular properties of Bi1.66Pb0.34Sr2Ca2−xMgxCu3Oy (x = 0, 0.2 and 0.4) samples has been done, using the AC susceptibility technique. The samples were prepared by conventional solid state reaction method. It was found that Mg substitution i...
Mg1− xCu xO (0.05 ≤ x ≤ 0.2) powder was prepared via solid-state reaction. The samples were examined by X-ray diffraction, and the...doi:10.1007/s12648-018-01369-4Gad, S. A.El Komy, G. M.Moustafa, A. M.