AZ31 alloy with Ce addition was studied. The influence of Ce contents on the microstructure and tensile properties of the alloy was analyzed. Ce addition results in the formation of AlzCe and the annealed microstructu...AZ31 alloy with Ce addition was studied. The influence of Ce contents on the microstructure and tensile properties of the alloy was analyzed. Ce addition results in the formation of AlzCe and the annealed microstructure is improved by the addition. There was no recrystallization of the alloy after rolling, however, it did occur after annealing. The alloy can be strengthened by adding Ce and the alloy with 1.05 wt.% Ce possessed the best synthetical properties of all the tested alloys. As rolled, σb and δof this alloy are 321 MPa and 6.9%, and as annealed, they are 259 MPa and 21.8%.展开更多
The microstructures of Al-Zn-Mg-Cu-Zr al- loys with minor Sc were studied by using optical microscope（OM）, scanning electron microscope （SEM） and transmission electron microscope（TEM）. The tensile mechanical pro...The microstructures of Al-Zn-Mg-Cu-Zr al- loys with minor Sc were studied by using optical microscope（OM）, scanning electron microscope （SEM） and transmission electron microscope（TEM）. The tensile mechanical properties and electric conductivity of the studied alloys under different treatment conditions were tested. The results show that adding minor Sc can greatly fines the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improves the tensile properties and electric conductivity of the alloys. The strengthening mechanism is considered as fine grain strengthening, sub-structure strengthening and dispersion strengthening by Al3 （Sc, Zr）.展开更多
The microstructure of the interface of the explosively welded tantalum-steel composite which hadbeen subjected to heat treatment at 1053 K was investigated by using optical microscopy and electron probemicro-analysis....The microstructure of the interface of the explosively welded tantalum-steel composite which hadbeen subjected to heat treatment at 1053 K was investigated by using optical microscopy and electron probemicro-analysis. It was confirmed that a Ta2C layer grew along the tantalum-steel interface. The carbon diffusion path at 1053 K, going through the γ-Fe, α-Fe, Ta2C and α-Ta phase regions was identified and interpreied by means of the Fe-Ta-C equilibrium phase diagram assuming that local equilibrium is established atall the phase boundaries.展开更多
主要研究在轴向过载下丁羟推进剂的压强耦合响应,基于双脉冲外部激励的方法,建立了 T 型燃烧器旋转过载试验系统,开展了丁羟推进剂在 0g、5g、15g 轴向载荷下的压强耦合响应试验研究,获得了丁羟推进剂在 T 型燃烧室中的燃面增益常数。...主要研究在轴向过载下丁羟推进剂的压强耦合响应,基于双脉冲外部激励的方法,建立了 T 型燃烧器旋转过载试验系统,开展了丁羟推进剂在 0g、5g、15g 轴向载荷下的压强耦合响应试验研究,获得了丁羟推进剂在 T 型燃烧室中的燃面增益常数。试验结果表明,轴向过载值越大,T 型燃烧器平均工作压强越低,包覆套筒里凝相残渣质量越多,分析认为过载下铝粉在药面过度聚集使得铝粉未充分燃烧,导致丁羟推进剂能量没有充分释放;随着轴向加速度的增加,T 型燃烧器燃面增益常数和凝相粒子浓度减小,从而造成阻尼效果明显减弱。展开更多
基金This project was financially supported by the Scientific Research Fund of Hunan Provincial Education Department (No. 05C575).
文摘AZ31 alloy with Ce addition was studied. The influence of Ce contents on the microstructure and tensile properties of the alloy was analyzed. Ce addition results in the formation of AlzCe and the annealed microstructure is improved by the addition. There was no recrystallization of the alloy after rolling, however, it did occur after annealing. The alloy can be strengthened by adding Ce and the alloy with 1.05 wt.% Ce possessed the best synthetical properties of all the tested alloys. As rolled, σb and δof this alloy are 321 MPa and 6.9%, and as annealed, they are 259 MPa and 21.8%.
文摘The microstructures of Al-Zn-Mg-Cu-Zr al- loys with minor Sc were studied by using optical microscope（OM）, scanning electron microscope （SEM） and transmission electron microscope（TEM）. The tensile mechanical properties and electric conductivity of the studied alloys under different treatment conditions were tested. The results show that adding minor Sc can greatly fines the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improves the tensile properties and electric conductivity of the alloys. The strengthening mechanism is considered as fine grain strengthening, sub-structure strengthening and dispersion strengthening by Al3 （Sc, Zr）.
文摘The microstructure of the interface of the explosively welded tantalum-steel composite which hadbeen subjected to heat treatment at 1053 K was investigated by using optical microscopy and electron probemicro-analysis. It was confirmed that a Ta2C layer grew along the tantalum-steel interface. The carbon diffusion path at 1053 K, going through the γ-Fe, α-Fe, Ta2C and α-Ta phase regions was identified and interpreied by means of the Fe-Ta-C equilibrium phase diagram assuming that local equilibrium is established atall the phase boundaries.
文摘主要研究在轴向过载下丁羟推进剂的压强耦合响应,基于双脉冲外部激励的方法,建立了 T 型燃烧器旋转过载试验系统,开展了丁羟推进剂在 0g、5g、15g 轴向载荷下的压强耦合响应试验研究,获得了丁羟推进剂在 T 型燃烧室中的燃面增益常数。试验结果表明,轴向过载值越大,T 型燃烧器平均工作压强越低,包覆套筒里凝相残渣质量越多,分析认为过载下铝粉在药面过度聚集使得铝粉未充分燃烧,导致丁羟推进剂能量没有充分释放;随着轴向加速度的增加,T 型燃烧器燃面增益常数和凝相粒子浓度减小,从而造成阻尼效果明显减弱。
