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Journal of Magnesium and Alloys 2014年第4期2卷 287-292页

作者： s.q.li W.N.Tang R.s.Chen W.Ke The Group of Magnesium Alloys and Their Applications Institute of Metal Research Chinese Academy of Sciences62 Wencui RoadShenyang 110016China

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 ***,a significant improvement with the tensile ductility was obtained by the pre-induced twinning in the former *** 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 ***,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.

关键词： Magnesium alloy Pre-induced twinning Multi-directional forging Refined-grain microstructure Tensile ductility

sTUDY ON FRACTOGRAPHY OF TRANsGRANULAR sCC OF 70Cu-3OZn IN AN AMMONIACAL sOLUTION

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Acta Metallurgica sinica(English Letters) 1998年第5期11卷 347-357页

作者： s.q.li J.I.Dickson J.P.Bailon

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.

关键词： fractography transgranular stress corrosion cracking (TsCC),70Cu-30Zn a-brass face-centered cubic (FCC) metal

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High cycle fatigue behavior of the forged Mg-7Gd-5Y-1Nd-0.5Zr alloy

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Journal of Magnesium and Alloys 2014年第4期2卷 357-362页

作者： D.Wu s.q.li M.Hong R.s.Chen E.H.Han W.Ke The Group of Magnesium Alloys and Their Applications Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China shenyang Aerospace University Shenyang 110036China

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 *** smooth specimen(Kt=1),under R=0.1 and along longitude direction,shows a high fatigue strength of 162 MPa at 107 *** fatigue behavior of the forged Mg-7Gd-5Y-1Nd-0.5Zr alloy exhibits a high sensitive to the ***,change of stress ratio from 0.1 to−1 may also result in a bad fatigue *** flux inclusions were elongated along longitude direction and/or transverse direction during the forging process of the Mg-7Gd-5Y-1Nd-0.5Zr *** 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.

关键词： Magnesium alloy Forge High cycle fatigue stress ratio Inclusion

MICROsTRUCTURE MODIFICATIONs OF WROUGHT AND CAsT TiAl ALLOYs

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中国有色金属学会会刊：英文版 1999年第S1期9卷 188-196页

作者： Z.Y.Zhong, J.Zhang, s.q.li and D.X.Zou Central Iron & steel Research Institute, Beijing 100081, China

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.

关键词： TiAl alloys wrought alloys as cast alloys refinement homogenization modification

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基于术前甲状腺乳头状癌多模态超声的列线图预测中央区淋巴结转移

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国际医学放射学杂志 2022年第5期 612-613页

作者： q.Dai D.M.liu Y.Tao C.Ding s.q.li C.Zhao 谢永生

摘要目的基于甲状腺乳头状癌和颈部淋巴结的术前临床和多模态超声特征构建列线图预测中央区淋巴结转移（CLNM）。方法该回顾性研究共纳入822例甲状腺乳头状癌

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Microstructure and hydrogen storage characteristics of ball-milled Mg+x wt.%LaMg2Ni(x=0-30) composites

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Microstructure and hydrogen storage characteristics of ball-...

第九届全国氢能学术会议

作者： G.C.liu,L.X.Chen,s.K.Peng,X.Z.Xiao,H.W.Ge,s.q.li Zhejiang University,China

Magnesium or magnesium hydride is a most promising candidate for hydrogen storage material because of its high theoretical hydrogen absorbing capacity and low ***, its kinetic properties are not satisfactory and relatively high temperature is necessary for hydrogenation and dehydrogenation due to its large formation enthalpy of *** this study,the nano-crystalline Mg+x wt%LaMgNi(x=0,5,10,20,30) composites were

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Phase structures and electrochemical hydrogen storage properties of V2.1TiNi0.4Zr0.06Mnx(x=0-0.20) alloys

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Phase structures and electrochemical hydrogen storage proper...

第九届全国氢能学术会议

作者： F.Y liu,L.X.Chen,Y.M.Jia,T.Ying,s.q.li,Yq.Lei Zhejiang University,China

Recently,the V-Ti-Ni based hydrogen storage electrode alloys with dual-phases structure have been attractive for their potential application in the Ni-MH battery because of their large hydrogen storage *** our previous study,it was found that VTiNiZr alloy showed a large initial discharge capacity and a poor cycling *** order to improve its electrochemical properties further,we chose Mn as the added alloying element and investigated the microstructure and electrochemical hydrogen storage properties of

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Phase structures and hydrogen storage properties of non-stoichiometric Ti0.95Zr0.15Mn1.4+xMo0.1Cr0.2V0.2(x=0-0.3) alloys

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Phase structures and hydrogen storage properties of non-stoi...

第九届全国氢能学术会议

作者： X.Luo,L.X.Chen,X.L.Fan,Z.Wu,Zh.M.Hang,s.q.li Zhejiang University,China

To develop a suitable material for hydrogen storage tank,the non-stoichiometric TiZrMnMoCrV(x=0,0.1,0.2,0.3) alloys were prepared,and their phase structure and hydrogen storage properties have been *** results show that all the alloys consist of a single C14 Laves phase with hexagonal structure,and the unit cell volume

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Hydrogen storage properties of nonstoichiometry La((2-x))TixMg(NiCo)9.5(x=0.0-0.5) alloys

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Hydrogen storage properties of nonstoichiometry La((2-x))Tix...

第九届全国氢能学术会议

作者： R.G Chen,X.H.Wang,R.Z.Jin,L.X.Chen,s.q.li,H.W.Ge,Y.q.Lei,C.P.Chen Zhejiang University,China

La(2-x))TiMg(NiCo)(x=0.0-0.5) alloys were prepared and the effect of partial substitution of Ti for La on the hydrogen storage properties of nonstoichiometry La(2-x))TiMg(NiCo)(x=0.0-0.5) quinary alloys were *** measurements showed that all alloys were consisted of a main phase with hexagonal PuNi-type structure and a few impurity phases(mainly LaNi phase).The hydrogen absorption/desorption

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背对背连接的土工合成材料加筋土挡墙的分析与设计

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路基工程 1997年第6期 78-85页

作者： s.C.R.Lo s.q.li M.Gopalan Z.Gao 孙增生铁道部科学研究院西北分院

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... 详细信息

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。

关键词：铁路加筋土挡土墙土工合成材料分析设计

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