AA6061铝合金等温时效析出动力学及析出强化模拟计算

doi:10.3901/JME.2021.20.126

机械工程学报 ›› 2021, Vol. 57 ›› Issue (20): 126-132.doi: 10.3901/JME.2021.20.126

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AA6061铝合金等温时效析出动力学及析出强化模拟计算

陈震昊¹, 徐骏^1,2, 刘庆冬^1,3, 李传维¹, 顾剑锋^1,2

1. 上海交通大学材料改性与数值模拟研究所上海 200240;
2. 上海交通大学上海市激光制造与材料改性重点实验室上海 200240;
3. 上海交通大学高新船舶与深海开发装备协同创新中心上海 200240

收稿日期:2020-07-21 修回日期:2021-05-17 出版日期:2021-10-20 发布日期:2021-12-15
通讯作者: 顾剑锋(通信作者),男,1970年出生,博士,教授,博士研究生导师。主要研究方向为热处理值模拟及其工程应用。E-mail:gujf@sjtu.edu.cn
作者简介:陈震昊,男,1996年出生。主要研究方向为材料热处理过程的数值模拟。E-mail:szzxczh@sjtu.edu.cn

Simulation and Computation of Isothermal Precipitation Kinetics and Precipitation Strengthening for AA6061 Aluminum Alloy

CHEN Zhenhao¹, XU Jun^1,2, LIU Qingdong^1,3, LI Chuanwei¹, GU Jianfeng^1,2

1. Institute of Materials Modification and Modeling, Shanghai Jiao Tong University, Shanghai 200240;
2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240;
3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240

Received:2020-07-21 Revised:2021-05-17 Online:2021-10-20 Published:2021-12-15

摘要/Abstract

摘要： 应用Kampmann-Wagner Numerical（KWN）模型模拟计算AA6061铝合金在190℃、210℃和225℃等温时效过程中沉淀相的析出动力学行为，得到沉淀相尺寸分布、数量密度和体积分数的演变规律，准确预测到时效进入粗化阶段时沉淀相粒子尺寸和体积分数变化曲线的拐点。利用不同升温速率下差示扫描量热试验的实测数据并结合等转变量分析方法，获得了沉淀相相对转变量曲线，其与模型计算结果吻合较好。应用析出强化模型，计算等温时效过程中AA6061铝合金屈服强度的变化，并通过与实测的由硬度转换的屈服强度进行比较，验证了计算方法的有效性。

关键词: AA6061铝合金, 等温时效, 析出动力学, KWN模型, 析出强化模拟

Abstract: The Kampmann-Wagner Numerical (KWN) model is used to simulate and calculate the precipitation kinetics behavior of AA6061 aluminum alloy during isothermal ageing at 190℃, 210℃ and 225℃. Evolution laws of particle size distribution, particle number density and precipitate volume fraction are obtained. The model can accurately predict the inflection point of particle size and precipitate volume fraction evolution when ageing enters coarsening period. Combined with isoconversional method, experimental result of differential scanning calorimetry(DSC) at different heating rate is used to obtain the precipitation reaction progress curve, which is in good agreement with the calculation result. Yield strength evolution during isothermal ageing is calculated using precipitation strengthening model and the calculation method proposed here is validated by comparing with the yield strength converted from the measured hardness.

Key words: AA6061 aluminum alloy, isothermal ageing, precipitation kinetics, KWN model, precipitation strengthening simulation

中图分类号:

TG156

陈震昊, 徐骏, 刘庆冬, 李传维, 顾剑锋. AA6061铝合金等温时效析出动力学及析出强化模拟计算[J]. 机械工程学报, 2021, 57(20): 126-132.

CHEN Zhenhao, XU Jun, LIU Qingdong, LI Chuanwei, GU Jianfeng. Simulation and Computation of Isothermal Precipitation Kinetics and Precipitation Strengthening for AA6061 Aluminum Alloy[J]. Journal of Mechanical Engineering, 2021, 57(20): 126-132.

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AA6061铝合金等温时效析出动力学及析出强化模拟计算

Simulation and Computation of Isothermal Precipitation Kinetics and Precipitation Strengthening for AA6061 Aluminum Alloy

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