全文获取类型
收费全文 | 490篇 |
免费 | 4篇 |
国内免费 | 10篇 |
专业分类
综合类 | 9篇 |
化学工业 | 26篇 |
金属工艺 | 94篇 |
矿业工程 | 1篇 |
能源动力 | 6篇 |
无线电 | 10篇 |
一般工业技术 | 19篇 |
冶金工业 | 14篇 |
原子能技术 | 2篇 |
自动化技术 | 323篇 |
出版年
2023年 | 25篇 |
2022年 | 6篇 |
2021年 | 41篇 |
2020年 | 48篇 |
2019年 | 32篇 |
2018年 | 29篇 |
2017年 | 30篇 |
2016年 | 9篇 |
2015年 | 30篇 |
2014年 | 29篇 |
2013年 | 20篇 |
2012年 | 8篇 |
2011年 | 36篇 |
2010年 | 24篇 |
2009年 | 35篇 |
2008年 | 33篇 |
2007年 | 26篇 |
2006年 | 12篇 |
2005年 | 5篇 |
2004年 | 8篇 |
2003年 | 7篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1998年 | 2篇 |
排序方式: 共有504条查询结果,搜索用时 15 毫秒
91.
《Calphad》2015
We used CALPHAD-type model to describe single crystal elastic constants of bcc solution phases in Zr–Nb system. The model parameters were evaluated by utilizing least square algorithm based on available experimental and first-principles data. The composition-polycrystalline elastic properties profiles of the Zr–Nb alloys of full composition were predicted and are in agreement with experimental data. The critical temperature corresponding to the dynamical stabilization of bcc pure Zr can be estimated to 600 K and the critical composition corresponding to the dynamical stabilization of bcc Zr–Nb alloys at room temperature is about 4 at% Nb. The current calculations present an effective strategy to design biomedical alloys using a computational method. 相似文献
92.
《International Journal of Hydrogen Energy》2020,45(58):33759-33770
The hydrogen storage properties of the novel equiatomic TiZrNbFeNi and non-equiatomic Ti20Zr20Nb5Fe40Ni15 high entropy alloys (HEAs) were studied. These alloys were designed with the aid of thermodynamic calculations using the CALPHAD method due to their tendency to form single C14 Laves phase, a phase desirable for room-temperature hydrogen storage. The alloys, which were synthesized by arc melting, showed a dominant presence of C14 Laves phases with the (Zr, Ti)1(Fe, Ni, Nb, Ti)2 constitution and small amounts of cubic phases (<1.4 wt%), in good agreement with the thermodynamic predictions. Hydrogen storage properties, examined at room temperature without any activation procedure, revealed that a maximum hydrogen storage capacity was reached for the equiatomic alloy in comparison to the non-equiatomic alloy (1.64 wt% vs 1.38 wt%) in the first cycle; however, the non-equiatomic alloy presented superior reversibility of 1.14 wt% of hydrogen. Such differences on reversibility and capacity among the two alloys were discussed based on the chemical fluctuations of hydride-forming and non-hydride-forming elements, the volume per unit cell of the C14 Laves phases and the distribution of valence electrons. 相似文献
93.
94.
《Calphad》2019
The liquidus surface projection and isothermal section at 1273 K of the Ni–Ti–V system were established using X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersion spectroscopy (EDS), electron probe micro-analyzer (EPMA) and differential thermal analysis (DTA) techniques. Six primary solidification regions and four invariant reactions were deduced in the liquidus surface projection, and six three-phase regions were derived in the isothermal section at 1273 K. No ternary compound was observed. According to the experimental results in the present work and literatures, the Ni–Ti–V system was modeled by means of the CALPHAD (CALculation of PHAse Diagram) method. Two-sublattice model (Ni,Ti)10(Ni,Ti)20 for binary σ phase was used, and the thermodynamic parameters of the σ and NiV3 phases in the Ni–V system was reassessed. Solution phases (liquid, fcc, bcc and hcp) were modeled with the substitutional solution model in the Ni–Ti–V system. The compounds, Ni3Ti, NiTi2, Ni3V and σ, were treated as (Ni,Ti,V)m(Ni,Ti,V)n, and B2 were treated as (Ni,Ti,V)0.5(Ni,Ti,V) 0.5Va3. A set of self-consistent thermodynamic parameters of individual phases was obtained. 相似文献
95.
《Calphad》2019
Diffusion couples were prepared and annealed at 1373 K for 72 h and 1473 K for 48 h, respectively. The interdiffusion coefficients at the intersection composition were obtained using the Whittle and Green method and the ternary trace diffusion coefficients using Hall method. The experimental diffusion coefficients of Ti and Nb in bcc Ti-Zr-Nb system were assessed to develop an atomic mobility database. The calculated diffusion coefficients and composition profiles show good agreement with the experimental data. 相似文献
97.
98.
《Calphad》2020
The liquidus surface projection and isothermal sections at 1173 and 1373 K of the Ni–Ti–W system were constructed on the basis of microstructure and phase constituents of as-cast and annealed alloys, which were obtained by means of scanning electron microscopy (SEM) coupled with energy dispersion spectroscopy (EDS), X–ray diffraction (XRD). Six primary solidification regions were determined in the liquidus surface projection. Five and six three-phase regions were derived in the isothermal sections at 1173 and 1373 K, respectively. No new ternary compounds were found. Based on the present experimental data, the Ni–Ti–W system was optimized using CALPHAD (CALculation of PHase Diagram) method. The solution phases, liquid, fcc, bcc, and hcp, were treated as substitutional solution. Two compounds Ni3Ti and NiTi2 were treated as (Ni,Ti,W)m(Ni,Ti,W)n, and Ni4W was treated as (Ni,Ti)4W1 by a two-sublattice model. NiTi with B2 crystal structure was treated as the ordered phase of bcc solution, and model was (Ni,Ti,W)0.5(Ni,Ti,W)0.5(Va)3. A set of self-consistent thermodynamic parameters was obtained. 相似文献
99.
100.
Liquid-Solid Phase Equilibria in Metal-Rich Nb-Ti-Hf-Si Alloys 总被引:2,自引:0,他引:2