共搜索到19129条信息，每页显示10条信息，共1913页。用时：0小时0分0秒443毫秒
is, the faster the β1 formation is, the shorter the time of transforming to the equilibrium phase β is. The time of β′ phase transforming into β1 phase is the longest during secondary ageing, while that of β1... phase. Key words: Mg-Gd-Y-Zr alloy; secondary ageing; precipitate; heat-resistance Mg-9Gd-4Y-0.6Zr合金的比强度和比模量高以及耐热性好的优点适合制作卫星和飞船等航天器的零部 件[1-2].卫星零部件裸露在太空中的环境温差大,向着太阳面的温度高达200 ℃；卫星在太空中微重力下运行......
Reduction in secondary dendrite arm spacing in cast eutectic Al–Si piston alloys by cerium additionR.Ahmad,M.B.A.Asmael,N.R.Shahizan,S.GandouzDepartment of Manufacturing and Industrial Engineering, Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia摘 要:The effects of Ce on the secondary dendrite arm spacing(SDAS......
J. Cent. South Univ. Technol. (2007)06-0826-06 DOI: 10.1007/s11771-007-0157-2 Bifurcation control of nonlinear oscillator in primary and secondary resonance LI Ke-an(李克安)1... of differential equation, a saddle-node bifurcation was found in case of primary and secondary resonance. To control the jumping phenomena and the unstable region of the nonlinear oscillator, feedback controllers......
A MONTE CARLO SIMULATION OF SECONDARY ELECTRON AND BACKSCATTERED ELECTRON IMAGES IN SCANNING ELECTRON MICROSCOPY H.M.Li1,Z.J.Ding1 (1.Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China) Abstract:A new parallel Monte Carlo simulation method of secondary electron (SE) and backscattered......
and SEM/EDS analysis and was further explained from the ternary phase diagram calculation. The results show that the formation of the secondary phases in Mg-Zn-Y-Zr alloys firmly depends on the mole... that the Mg-Zn-Y alloys containing icosahedral phase (I-phase) as a secondary solidification phase exhibited good mechanical properties at room temperature as well as at elevated temperature. To the reason why......
℃ in N2atmosphere.A small content of SiO2 favored the formation of secondary phase Lu4Si2O7N2,while large content of SiO2 favored the formation of secondary phase Lu2Si2O7 and Si2N2O.Porous Si3N4 ceramics with secondary phase Lu4Si2O7N2 had a flexural strength of 207 MPa,while that with secondary phase Si2N2O and Lu2Si2O7 had lower flexural strength.关键词:......
: 10.1107/S1600536811012141. [23] GAFIROV M M, KIRILLOV S A, GOROBETS M I, RABADANOV K S, ATAEV M B, TRETYAKOV D O, AYDEMIROV K M. Phase equilibria and ionic solvation in the lithium tetrafluoroborate...] KIRILLOV S A, GOROBETS M I, TRETYAKOV D O, ATAEV M B, GAFUROV M M. Phase diagrams and conductivity of lithium salt systems in dimethyl sulfoxide, propylene carbonate and dimethyl carbonate [J......
Modeling of ratcheting accumulation of secondary deformation due to stress-controlled high-cyclic loading in granular soilsJIA Peng-fei(贾鹏飞)1, KONG Ling-wei(孔令伟)2(1. State Key Laboratory... by repeated drained loading over a large number of cycles.Key words:ratcheting accumulation; secondary deformation; response envelope; high-cyclic loading; granular soils......
J. Cent. South Univ. Technol. (2011) 18: 1029-1033 DOI: 10.1007/s11771-011-0799-y Effect of microwave irradiation on secondary structure of α-amylase by circular dichroism ZHANG Xiao-yun(张小云)1, 2... irradiation with α-amylase, the circular dichroism (CD) and secondary structure changes of α-amylase under the condition of microwave irradiation and water bath were studied by circular dichroism spectra......
重载齿轮钢的高温性能张国强1,2,董瀚2,王毛球2,赵亚平3,刘荣佩-1(1.云南省昆明市昆明理工大学材料与冶金工程学院2.北京市钢铁研究总院先进钢铁材料技术国家工程研究中心3.宝山钢铁股份有限公司 特殊钢分公司,上海 200940)摘 要:通过Gleeble-1500D热模拟试验机高温拉伸试验,对比研究了17Cr2Ni2 MoVNb和17Cr2Ni2 Mo钢的高温性能.结果表明:因微合金元素V(0.1%,质量分数,下同),Nb(0.036%)产生细晶强化及固溶强化,17Cr2Ni2 MoVNb钢的抗拉强度比1......
