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alloy; precipitation; age hardening; anisotropy; crystal growth 1 Introduction For nearly 100 years the AA2024 Al-Cu-Mg alloys have been important materials for the aerospace industry due to their excellent strength and plasticity [1,2]. As one of the widely used age-hardenable aluminum alloys, both their precipitate characteristics, such as the morphology, the crystallographic orientation......
Surface topography evolvement of galvanized steels in sheet metal forming HOU Ying-ke(侯英岢)1, YU Zhong-qi(于忠奇)1, ZHANG Wei-gang(张卫刚)1, JIANG Hao-min(蒋浩民)2, LIN Zhong-qin(林忠钦)1 1...; Abstract: U-channel forming......
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; tensile strength; precipitation; age hardening 1 Introduction Magnesium and its alloys are named as green metallic materials for the 21st century because of their low density and energy-saving capacity... hardening mechanisms and techniques to improve the strength of Mg alloys after plastic forming. Researchers have devoted to study aging performances and mechanisms of Al-Mg alloys[1-6]. In recent......
Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai.... Creep test was carried out at 200-300 ℃ under 50-120 MPa. Within the limits of the creep test conditions used in this study, the creep activation energy of the investigated alloys was in the range......
ZHANG1, Li-jie ZUO2, Jian FENG3, Bing YE1, Xiang-yang KONG4, Hai-yan JIANG1, Wen-jiang DING1 1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal.... However, the TEPMC and TEHPDC alloys have similar tensile strength around 67 MPa at 350 °C. Due to the coarsening of eutectic Si, the TEPMC alloy exhibits better creep resistance than the TEHPDC......
curves of self-compacting concrete beams are very similar to those of vibrating concrete beams. The rate of creep development is very high at early ages and slows down as the age of concrete increases... 450×10-6. Creep deflection of self-compacting reinforced concrete beam decreases as the tensile reinforcing ratio increases. The deflection creep coefficient of self-compacting reinforced concrete......
FERROELECTRIC CHARACTERISTICS OF SrBi2Ta2O9 THIN FILMS ANNEALED IN FORMING GAS A.D.Li1,N.B.Ming1,D.S.Wang2,Z.G.Liu1,D.Wu1,T.Yu2,A.Hu2 (1.Department of Material Science and Engineering & National..., China) Abstract:The degradation behavior of SrBi2 Ta2O9 (SBT) thin filras annealed in forming gas (5%H2+95%N2) was investigated. The ferroelectric remnant polarization Pr of SBT had a severe decrease......
Kelvin模型.在整个计算过程中,法向刚度和切向刚度均会随时间发生变化,其部分Fish语言如下: def parameter_time age=age+1e-3 creep_time=age parameter_kn=1/((1/k_1n)*(1-exp(- (k_1n/v_1n)* creep_time))+1/m_1n) parameter_ks=1/((1/k_1s...; 文献标识码:A 文章编号:1672-7207(2009)03-0814-08 Creep model for rock mass considering normal creep of rock joint plane XIONG......