Papers by Keyword: EET

Abstract: For the purpose of studying vacancy effect on physics and mechanics property, authors advance a method of calculating mono-vacancy cell valence construction, and get 5 phase construction factors n_AF andα on electron layer. It indicates that vacancy increase electrical resistivity and intensity, and decrease plasticity, which are consistent with experiments. The paper open out the relation between vacancy and physics and mechanics property on electron layer.

Abstract: To investigate the fatigue property of carbon structural steel in theory, the microstructure and properties of quenched martensite must be studied in detail. In this paper, the electronic structure and mechanical properties of carbon structural steel in quenched state were calculated by the empirical electron theory of solids and molecules (EET). The relationship between electronic structure parameters and mechanical properties of martensite was investigated. The mechanical properties of quenched carbon structural steel were calculated theoretically, and the result of theoretical calculation is consistent with the experiment result.

Abstract: The mechanical properties in low-alloy steel are studied systematically from the view of valence electrons using the Empirical Electron Theory in solid and molecules (EET). Two new valence electron structure parameters ρ^c_v and ρ^l_v, which have closely relation with the mechanical properties of alloy steel are summed up according to the basic idea of EET. The values of the two new valence electron structure parameters in carbon steel and alloy steel which contains Cr, Mn, Ni, Si, W and Mo are calculated. The result demonstrates that ρ^c_v has a very good corresponding relationship with intensity, and ρ^l_v has a very good corresponding relationship with plasticity. In this note, a quantitative empirical formula between the valence electrons structure and the intensity and plasticity of alloy steel is initially set up. Keywords: EET, valence electron structure, mechanical property, low-alloy steel

Abstract: Based on Empirical Electron Theory in solid (EET) and Bond Length Difference (BLD) the valence electron structures of precipitates in AlCu alloy during aging process were calculated. The results show that the different phase structure factors explain the thermal stability of phases in θ sequence, and the tendency of atoms solution is corresponding with the phase transition during aging from valence electron structure levels, which reveals the inside causes of ageing hardening is closely related to the covalent electron pairs in some bond of the precipitations and matrix.

Abstract: Statistical values of valence electron structure parameter for phase structures of super saturation solid solutions in the initial aging stage of Al-Cu-Mn alloy were calculated by using the Empirical Electronic Theory in solid and molecules (EET), then the influence of various kinds of unit cells on the aging initial stage of the Al-Cu-Mn alloy subjected to the electron pulse modification was analyzed. The results show that the a-Al-Cu-Mn phase structure unit (cell) with larger atomic distortion provides the driving force for the saturated Al-Cu-Mn alloy to form G.P quickly and results in the increase in the primary nucleus of Al-Cu-Mn alloy; thus the a-Al-Cu-Mn phase structure unit (cell) playes an important role in the improvement of alloy aging. After the application of pulsed electric field into Al-Cu-Mn alloy melt, the movement of atoms is accelerated, and the number of segregation units of Al-Cu-Mn is increased, as a result the number of the second phase is increased; generating the remarkable aging strengthening.

Abstract: Based on the empirical electron theory (EET) of solids and molecules, the valence electron structures (VESs) of TiC-Mo(Ni)-Fe system were calculated by building proper structure model. The results indicate that additives of Mo and Ni improve the interface conjunction factors of the cermets in different ways. By adding Mo, the VESs of the ceramic phase are improved for the formation of the rim phase (Ti1-xMox)C, which leads to the enhancement of the interface conjunction, while the improvement of the VESs on metal phase by adding Ni is due to the formation of the Fe100-yNiy. Mo and Ni additives increase the interface electron density of cermets, that is, the adding of the Mo and Ni enhance the overlapping grade of the electron cloud on interface and increase the binding energy of the interface, which is propitious to the wettability. The best wettability was found at x=0.5 or y=30.