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| 1 | Effect of pre-induced twinning on microstructure and tensile ductility in GW92K magnesium alloy during multi-direction forging at decreasing temperature显示文摘Effect of pre-induced twinning on the microstructure evolution and mechanical properties of extruded Mg-9.26Gd-2.08Y-0.36Zr(GW92K)alloy have been investigated during multi-direction forging with large strains at decreasing temperature from 400℃ to 300℃.The results showed that,whether there pre-induced twinning existing in the initial microstructure by pre-deformation or not,a mixed microstructure of residual coarse grains and notably refined grains formed under both conditions,combing with some residual coarse grains with less deformation inside grains and lots of dispersed nano-precipitates distributed along refined grain boundaries.However,a significant improvement with the tensile ductility was obtained by the pre-induced twinning in the former alloy.It was suggested that,the pre-induced twinning largely contributed to the grain refinement and lead to an increase in the ratio of fine grain structure which would be responsible for the better properties.Furthermore,during subsequent forging deformation in the pre-deformed sample,the grain refinement mechanism by gradual grain orientation rotation around the surface section in residual coarse-grains was a little different from that by the macro-shear deformation in the as-extruded condition. | S.Q.Li W.N.Tang R.S.Chen W.Ke | 2014 | Journal of Magnesium and Alloys2014，2，4： | 8 |
| 2 | MICROSTRUCTURE MODIFICATIONS OF WROUGHT AND CAST TiAl ALLOYS显示文摘The recent advances in the microstructure modifications of wrought and cast TiAl alloys in CISRI were presented. The contributed results and discussions included the aspects and mechanisms of the refinement and homogenization of the FL microstructure in wrought TiAl alloy and the microstructure adjustment of cast TiAl alloy. The mechanical properties of the modified microstructures of wrought and cast Ti 46.5 Al 2.5 V 1.0 Cr (mole fraction,%) alloys have been experimentally evaluated as well. | Z.Y.Zhong, J.Zhang, S.Q.Li and D.X.Zou Central Iron & Steel Research Institute, Beijing 100081, China | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 3 |
| 3 | Ionic liquid-based ultrasound-assisted dispersive liquid-liquid microextraction combined with electrothermal atomic absorption spectrometry for a sensitive determination of cadmium in water samples显示文摘 | S.Q.Li S.Cai W.Hu | | 0，，： | 1 |
| 4 | An efficient imaging algorithm for spaceborne squint spotlight SAR显示文摘 | X.L.Han S.Q.Li R.Wang | | 0，，： | 1 |
| 5 | 背对背连接的土工合成材料加筋土挡墙的分析与设计显示文摘本文研究了承受由轨道传来的重型滞留超载的背对背连接的土工合成材料加筋土挡墙的设计。挡墙设计中使用了简化法则,应用非线性有限元分析,研究了临界断面。发现背对背连接挡墙的应力、应变场与普通加筋土挡墙的完全不同。然而,如果在所提供的刚度范围内使用土工合成材料加固,那么简化设计准则就给出一种偏小的加筋张力和相对于有限元结果的连结力系数。如果采用金属加筋,有限元分析预测的加筋张力就大得多,这种差异是由于背对背连结挡墙对加筋刚度的依赖性而引起的。 | S.C.R.Lo S.Q.Li M.Gopalan Z.Gao 孙增生 | 1997 | 路基工程1997，，6： | 0 |
| 6 | High cycle fatigue behavior of the forged Mg-7Gd-5Y-1Nd-0.5Zr alloy显示文摘This paper investigated the high cycle fatigue behavior of a forged Mg-7Gd-5Y-1Nd-0.5Zr alloy with different stress concentration factor(Kt),under different stress ratio(R),and along different loading direction.The smooth specimen(Kt=1),under R=0.1 and along longitude direction,shows a high fatigue strength of 162 MPa at 107 cycles.The fatigue behavior of the forged Mg-7Gd-5Y-1Nd-0.5Zr alloy exhibits a high sensitive to the notch.Moreover,change of stress ratio from 0.1 to−1 may also result in a bad fatigue property.The flux inclusions were elongated along longitude direction and/or transverse direction during the forging process of the Mg-7Gd-5Y-1Nd-0.5Zr alloy.The interface between the flux inclusion and the matrix may debond and serve as the crack initiation site during the fatigue loading process,leading to the deterioration of the fatigue property along thickness direction and a high anisotropic fatigue behavior between longitude direction and thickness direction. | D.Wu S.Q.Li M.Hong R.S.Chen E.H.Han W.Ke | 2014 | Journal of Magnesium and Alloys2014，2，4： | 0 |
| 7 | STUDY ON FRACTOGRAPHY OF TRANSGRANULAR SCC OF 70Cu-3OZn IN AN AMMONIACAL SOLUTION显示文摘The microfractography of transgranular stress corrosion cracking (TSCC) of 70Cu-30Zn a-brass in ammoniacal solution was studied. The observations indicate that on a very microscale, the crack path of TSCC of or-brass follows {111} planes. The crack path very often alternates between {111} Planes to result in 'cleavage-like'facet, the usual average orientation of which is {110} with preferential microscopic crack propagation in (100) and (112) directions. The average orientation of wide secondary facets is often close to {100}. The size of {111} microfacets increases with incrmsing stress intensity K, which indicates that the microscopic crack path follows {111} planes on which some localized slip has occurred. Possible TSCC mechanisms which appear to be consistent with the microfraphic features observed in the present study are also discussed. | S.Q.Li J.I.Dickson J.P.Bailon | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，5： | 0 |
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