具有盘状析出相铝合金的时效强化模型

A model for age strengthening of plate-like-precipitate-containing Al alloys

以析出热力学、长大动力学及强化理论为基础 ,研究了具有盘状析出相的铝合金在时效过程中的析出相尺寸、体积分数变化及其对时效合金强化效果的影响 ,得到了合金成分、时效参数与组织参数、屈服强度间的解析关系式 ,进而从微观与宏观相结合的角度建立起了具有盘状析出相铝合金的时效工艺—屈服强度量化模型 ,并将该模型应用于Al Cu二元系列合金的时效性能预测 ,取得了较满意的结果。同时 ,由数据的归纳和组合得出了Al Cu二元系列合金中盘状析出相临界形核能垒的简易求解式 f(ΔG ,x0 /xe) =常数 ,有助于该模型的普遍适用化。

A simplified model was presented to establish the quantitative relations between yield strength of aged Al alloys containing plate like precipitates and the sizes, volume fraction of precipitates, which are dominated by ageing temperature, time as well as alloy compositions. The nucleation, growth and coarse of the precipitates are integrated into the age strengthening model based on some acceptable assumptions. The ageing strengthening of Al Cu binary alloys was satisfactorily simulated and predicted. Furthermore, the critical energy barrier for nucleation of precipitates in aged Al Cu binary alloys, is determined from a simple ad hoc formula configured on the basis of tailoring relevant parameters, f (Δ G *, x 0/ x e)=constant, by which the model becomes of more feasibility, integrality and applicability. [