材料期刊网

INFLUENCE OF AGING ON MICROSTRUCTURE AND TENSILE BEHAVIOR OF Al ALLOY 8090

JIANG Daming , SUN Fenglian , HONG Bandc , LEI TingquanHarbin Institute of Technology , Harbin , ChinaDOWNHAM D A , LORIMER G WUniversity of Manchester , UK

金属学报(英文版)

The variations of microstructure and tensile behavior of an Al-Li-Cu-Mg-Zr alloy during aging are studied in this paper. It has been found that the fine δ-phase precipitated in the underaging condition and that the δ-, S-and T1-phases precipitate in the peak aging and the overaging conditions. The alloy exhibits transgranular fracture on the underaging condition, and mixture of transgranular and intergranular ruptures in the peak aging and overaging conditions.

关键词: A1 alloy 8090 , null , null , null

A COMPREHENSIVE INVESTIGATION ON A PECULIAR DEFECT IN WURTZITE GaN FILM

S.Q.Wang1 , 2) and H.Q.Ye1) 1) Laboratory of Atomic Imaging of Solids , Institute of Metal Research , The Chinese Academy of Sciences , Shenyang 110015 , China 2)Department of Materials Science and Metallurgy , University of Cambridge , Cambridge CB2 3QZ , UK

金属学报(英文版)

Apeculiar crystal defect was observed by experiment of high resolution electron microscopy( HREM) .It wasidentifiedtoformed bytwothreading dislocationsand asegmentof(11 20) domain boundary. An atomicstructure model was proposed for the anomalous defect. Theresultofthe weak beam experimentofelectron microscopeaffirmedthesuggested model.Thestructuralpropertiesofseveral GaN(11 2 0) domain boundaries werestudied by Molec ular Dynamicscalculations. Thetheoreticalresultsshowedthatthelike atom bonding domain boundary, whichcomposesthe main partofthe peculiar defect, has much higher formationenergy than itcounterpartof unlike atom bonding domain boundary. Theoutcome providesanotherevidenceforthesuggested model.

关键词: HREM , null , null , null , null

低碳低合金钢的静力韧度与断裂韧度

芦琳 , 李周波 , 毕宗岳 , 薛磊红 , 马璇

钢铁

采取静拉伸和平面应变断裂韧性测试方法,测量了S355,S275,Q345D,Q345E 4种低碳低合金钢自室温至-100℃的基本力学性能,包括屈服强度、抗拉强度、静力韧度、断裂韧度以及韧脆转变温度,试图寻找4种金属材料静力韧度和断裂韧度之间的关系;通过对200多组样品的试验结果进行分析,发现4种金属材料在其各自韧脆转变温度之上的静力韧度Uk和断裂韧度J02BL存在线性关系.

关键词: 静力韧度 , 断裂韧度 , 韧脆转变温度

英国钢铁工业铁矿石烧结过程中的二垩英的形成及抑制

钢铁

Corus UK已经研究出减少铁矿石烧结过程中二垩英形成和排放的技术.94次测量结果表明五个英国烧结厂主要废气烟囱的排放物浓度范围为0.28～4.4 ng I-TEQ/m3.总平均值为1.19 ng I-TEQ/m3,该数值略高于英国环境局为新工厂制定的可以达到的排放限-1 ng I-TEQ/m3.基础研究总结出二垩英极可能在火焰锋前的烧结床中形成.当尿素在料带前加入到烧结混合料中时,抑制试验取得了成功,二垩英排放量至少减少50%.加入尿素似乎可提供一种成本有效的二垩英抑制方法,该试验正继续进行以证实该技术的长期可行性.

关键词: 二垩英 , 铁矿石烧结 , 形成 , 抑制