Abstract： The hot deformation behaviors of AI-Zn-Mg-Sc-Zr alloy were investigated in a temperature range of 340-500℃ and a strain rate range of 0.001-10 s 1 using uniaxial compression test on Gleeble-1500 thermal si...Abstract： The hot deformation behaviors of AI-Zn-Mg-Sc-Zr alloy were investigated in a temperature range of 340-500℃ and a strain rate range of 0.001-10 s 1 using uniaxial compression test on Gleeble-1500 thermal simulation machine. The results show that the flow stress increases with increasing strain and tends to be constant after a peak value. The flow stress increases with increasing strain rate and decreases with increasing deformation temperature. The phenomenon of dynamic recovery and dynamic recrystallization can be observed by microstructural evolutions. Based on the hyperbolic Arrhenius-type equation, the true stress-true strain data from the tests were employed to establish the constitutive equation considering the effect of the true strain on material constants （α, β, Q, n and A）, which reveals the dependence of the flow stress on strain, strain rate and deformation temperature. The predicted stress-strain curves are in good agreement with experimental results, which confirms that the developed constitutive equations are suitable to research the hot deformation behaviors of Al-Zn-Mg-Sc-Zr alloy.展开更多
The paper intends to contribute a framework of conceptualizing the emerging world order through interpreting the transformation of international political economy in an era of the rise of the BRICS and the ＂second wo...The paper intends to contribute a framework of conceptualizing the emerging world order through interpreting the transformation of international political economy in an era of the rise of the BRICS and the ＂second world.＂ It theorizes the dialectical nexus between the rise of the BRICs and the existing world order as an interdependent dynamic process of mutual challenge, mutual constraint, and mutual accommodation. One of the conceptual tools the paper applies is the notion of interdependent hegemony. The notion is seen as an important tool for conceptualizing and analyzing international relations and international political economy in the current era. The application of ＂interdependent hegemony＂ helps to explain that to what extent the BRICS can be identified as a unified alliance, a historical bloc, and to what extent they are generating functional or structural challenges to the existing international order. Likewise, it also helps to determine to what extent the hegemony of the existing order is still able to keep its resilient capacities and its structural powers and able to neutralize challenges from the emerging powers. The conclusion of the paper posits that the world is experiencing ＂interdependent hegemony＂ in the transition from the existing order to the emerging order.展开更多
基金Project(2012CB619503)supported by National Basic Research Program of China
文摘Abstract： The hot deformation behaviors of AI-Zn-Mg-Sc-Zr alloy were investigated in a temperature range of 340-500℃ and a strain rate range of 0.001-10 s 1 using uniaxial compression test on Gleeble-1500 thermal simulation machine. The results show that the flow stress increases with increasing strain and tends to be constant after a peak value. The flow stress increases with increasing strain rate and decreases with increasing deformation temperature. The phenomenon of dynamic recovery and dynamic recrystallization can be observed by microstructural evolutions. Based on the hyperbolic Arrhenius-type equation, the true stress-true strain data from the tests were employed to establish the constitutive equation considering the effect of the true strain on material constants （α, β, Q, n and A）, which reveals the dependence of the flow stress on strain, strain rate and deformation temperature. The predicted stress-strain curves are in good agreement with experimental results, which confirms that the developed constitutive equations are suitable to research the hot deformation behaviors of Al-Zn-Mg-Sc-Zr alloy.
文摘The paper intends to contribute a framework of conceptualizing the emerging world order through interpreting the transformation of international political economy in an era of the rise of the BRICS and the ＂second world.＂ It theorizes the dialectical nexus between the rise of the BRICs and the existing world order as an interdependent dynamic process of mutual challenge, mutual constraint, and mutual accommodation. One of the conceptual tools the paper applies is the notion of interdependent hegemony. The notion is seen as an important tool for conceptualizing and analyzing international relations and international political economy in the current era. The application of ＂interdependent hegemony＂ helps to explain that to what extent the BRICS can be identified as a unified alliance, a historical bloc, and to what extent they are generating functional or structural challenges to the existing international order. Likewise, it also helps to determine to what extent the hegemony of the existing order is still able to keep its resilient capacities and its structural powers and able to neutralize challenges from the emerging powers. The conclusion of the paper posits that the world is experiencing ＂interdependent hegemony＂ in the transition from the existing order to the emerging order.
