时效路径对<strong>Al-0.7Mg-0.5Si-0.2Cu-0.5Zn</strong>合金沉淀析出行为的影响

doi:10.11900/0412.1961.2019.00386

金属学报

2020, Vol. 56

Issue (7): 997-1006 DOI: 10.11900/0412.1961.2019.00386

本期目录 | 过刊浏览

时效路径对Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金沉淀析出行为的影响

朱亮¹, 郭明星¹^,²(

), 袁波¹, 庄林忠¹^,², 张济山¹^,²

1.北京科技大学新金属材料国家重点实验室北京 100083
2.北京科技大学现代交通金属材料与加工技术北京实验室北京 100083

Effect of Ageing Routes on Precipitation Behaviors of Al-0.7Mg-0.5Si-0.2Cu-0.5Zn Alloy

ZHU Liang¹, GUO Mingxing¹^,²(

), YUAN Bo¹, ZHUANG Linzhong¹^,², ZHANG Jishan¹^,²

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

朱亮, 郭明星, 袁波, 庄林忠, 张济山. 时效路径对Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金沉淀析出行为的影响[J]. 金属学报, 2020, 56(7): 997-1006.
Liang ZHU, Mingxing GUO, Bo YUAN, Linzhong ZHUANG, Jishan ZHANG. Effect of Ageing Routes on Precipitation Behaviors of Al-0.7Mg-0.5Si-0.2Cu-0.5Zn Alloy[J]. Acta Metall Sin, 2020, 56(7): 997-1006.

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摘要:

利用DSC、TEM、拉伸实验以及硬度测试等方法系统研究了时效路径对高Mg/Si比Al-Mg-Si-Cu-Zn合金沉淀析出行为的影响。结果表明，固溶淬火态和预时效态合金在非等温时效过程中β″相的析出激活能分别为80.1和64.5 kJ/mol；在等温时效过程中表现出不同的时效硬化和组织演化行为，其中固溶淬火态合金时效硬化速率较快，但最终2种路径处理的合金峰值硬度和强度基本相同；但经预时效处理的合金，峰时效态延伸率和应变硬化速率以及过时效阶段硬度降低速率均较高。与此同时，预时效态合金还可析出大量复合溶质原子团簇，虽然在高温等温时效时会进一步长大，但使得欠时效、峰时效和过时效态合金的沉淀相尺寸呈多尺度特征，而固溶淬火后直接等温时效的不同状态合金却无此特征。时效路径并未改变合金沉淀析出序列，但对沉淀相形核、长大速率影响显著，据此提出了时效路径对沉淀相形核和长大过程影响的模型示意图。

关键词 ： Al-Mg-Si-Cu-Zn合金, 时效路径, 预时效, 非等温时效, 等温时效

Abstract：

In order to reduce the weight of car body, Al-Mg-Si-Cu alloys have been widely studied and used to produce outer body panels of automobiles due to their favorable high-strength-to-weight ratio, recyclability and good formability. Moreover, the strength of Al-Mg-Si-Cu series alloys can be enhanced by bake hardening treatment. However, their formability and final strengths still need to be further improved compared to steels, which are the major obstacles to wide-scale application of Al alloys in the automotive fields. In this work, the effect of ageing routes on the precipitation behavior of Al-Mg-Si-Cu-Zn alloy with high Mg/Si ratio was systematically studied by DSC, TEM, tensile and hardness tests. The results show that the precipitation activation energies of the β″ phase formed in the non-isothermal ageing processes of the as-quenched and pre-aged alloys are 80.1 kJ/mol and 64.5 kJ/mol, respectively; both the different age hardening rates and microstructure evolution behaviors can be also observed during their isothermal ageing processes, such as, the age hardening rate of as-quenched alloy is much higher, but the peak hardness and strength values of the alloy treated by the two routes were basically the same. However, the elongation and strain hardening rate of the pre-aged alloy in the peak ageing state, and the hardness reduction rate in the over-ageing state are all much higher. In addition, a large number of complex solute clusters can be formed during pre-ageing, which will further grow in high temperature isothermal ageing process, but the sizes of precipitates formed in the under-ageing, peak-ageing and over-ageing states all show a multi-scale characteristics; in comparison, this feature cannot be found in the precipitates formed in the as-quenched alloy aged in the different conditions. The ageing routes cannot change the precipitation sequence of the alloy, but give a significant influence on the nucleation and growth rates of precipitates. As a consequence, a schematic diagram of nucleation and growth process of precipitates in the alloy with ageing routes is proposed.

Key words： Al-Mg-Si-Cu-Zn alloy ageing route pre-ageing non-isothermal ageing isothermal ageing

收稿日期: 2019-11-11

ZTFLH:

TG146.21

基金资助:国家重点研发计划项目(2016YFB0300801);国家自然科学基金项目(51871029);国家自然科学基金项目(51571023);国家自然科学基金项目(51301016);政府引导类计划-政府间双边创新合作项目(BZ2019019)

作者简介: 朱亮，男，1994年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00386 或 https://www.ams.org.cn/CN/Y2020/V56/I7/997

图1 Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金固溶淬火态和预时效态的DSC曲线

图2 Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金固溶淬火态及预时效态β″相的激活能计算过程图

图3 Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金的185 ℃等温时效硬化及峰时效态性能曲线

表1 不同时效路径处理后Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金峰时效态拉伸力学性能

图4 Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金185 ℃等温时效20 min的TEM像、HRTEM像及对应的Fourier变换(FFT)图

图5 Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金峰时效态的TEM像、HRTEM像和对应的FFT图，以及析出相尺寸分布图

图6 Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金过时效态的TEM像、HRTEM像及对应的FFT图

图7 时效路径对Al-0.7Mg-0.5Si-0.2Cu-0.5Zn合金沉淀相析出的影响模型图

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