【摘 要】
：
第一原理方法已被广泛用来预测材料的性质，或解释材料性质的物理机制。然而，工程合金成分及结构的复杂性使得其力学性质的第一原理研究存在极大困难。近年来，我们采用第一原理方法，尝试研究钛合金的微观组织及强韧性等力学性能。计算了钛合金固态相变过程中体相自由能变化及界面能消耗，从相变热力学角度，研究了相变变体选择，析出相形貌，析出相异质形核等影响多相钛合金微观组织的关键因素；计算了钛合金中各单相中位错滑移势
【机 构】
：
中国科学院金属研究所钛合金研究部,沈阳市文化路72号 中国科学院金属研究所钛合金研究部,沈阳市文化
论文部分内容阅读
第一原理方法已被广泛用来预测材料的性质，或解释材料性质的物理机制。然而，工程合金成分及结构的复杂性使得其力学性质的第一原理研究存在极大困难。近年来，我们采用第一原理方法，尝试研究钛合金的微观组织及强韧性等力学性能。计算了钛合金固态相变过程中体相自由能变化及界面能消耗，从相变热力学角度，研究了相变变体选择，析出相形貌，析出相异质形核等影响多相钛合金微观组织的关键因素；计算了钛合金中各单相中位错滑移势垒和临界剪切应力，相界滑移势垒与断裂功，从位错运动协调性及相界面可动性角度，研究了钛合金的强韧性行为。相关第一原理研究有助于理解钛合金的成分-结构-微观组织-力学性能关系，进而为钛合金的性能优化提供理论基础。
其他文献
With the swift development of technologies,more and more micro devices such as portable,wearable and implantable electronics are utilized in daily life.These devices require quite low power to operate
A method regarding frame lateral vibration control based on the state feedback of an additional oscillator is proposed,so as to improve the bogie hunting stability.The multi-objective optimization met
In this paper,a general contact stiffness model is proposed to study the mixed lubricated contact between a rough surface and a rigid flat plate.The total interfacial contact stiffness is composed of
In the mechanical transmission system,the gear is one of the most widely used transmission components.The failure of the gear will cause serious accident and huge economic loss.Therefore,the condition
Mechanical nonlinear vibration of slender structures,such as beams,strings,rods,plates and even shells occurs extensively in many areas,spanning from aerospace,automobile,cranes,ships,offshore platfor
Cable structures are always exposed to time varying thermal environments,and the temperature effects can be large enough to mask the changes caused by the damage and loading effects.The paper is conce
In the present study,a simple galloping-based electromagnetic energy harvester is improved.The electromagnetic transducer is attached to the prismatic structure with a linear damping and an essential
The time-varying dynamic characteristics of a telescopic cantilever rectangular plate of composite material subjected to the first-order aerodynamic force are investigated.According to the first-order
纳米层状金属材料具有超高强度，但塑性变形能力往往因剪切带的出现而明显降低，如何理解纳米层状金属共变形行为及其微观机制对于提高材料塑性变形能力具有重要意义。本研究以纳米尺度Cu/Au层状材料为模型材料， 通过纳米压入方式加载，结合高分辨透射电镜观察与定量表征，研究了纳米尺度Cu/Au层状材料的塑性变形行为。研究发现，在塑性变形的初始阶段，较软的Au层比较硬的Cu层呈现出低的变形能力，这一反常现象随着
In this talk, we will first present a discovery of a 2D ferroelectric materials family, rooted in Ⅲ2-Ⅵ3 van der Waals materials and distinctly characterized by exhibiting versatile ferroelectricity wi