具有盘／片状，棒／针状析出相铝合金的时效—屈服强度变化模型

A Model for Age Strengthening of Al Alloys with Plate/Disc-like or Rod/Needle-like Precipitate

摘要:

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／片状、棒／针状析出相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—宏观相结合的角度建立起了具有盘／片状、棒／针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6061合金和Al—Zn—Mg合金的时效性能预测，取得了较满意的结果。同时，详细讨论了析出相长径比对时效温度以及合金处理状况的依赖关系。

Abstract:

An unified model is presented to establish the quantitative relations between yield strengths of aged Al alloys containing plate/disc like or rod/needle like precipitates and the sizes, volume percentages of precipitates, The nucleation, growth and coarse of the precipitates are integrated into the age strengthening model based on some acceptable assumptions. The aging strengthening of AA6061 and an Al Zn Mg alloy has been satisfactorily simulated and predicted. Furthermore, the dependence of aspect ratio of plate/disc like or rod/needle like precipitates on aging temperature and processing condition is discussed in detail.