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金属学报  2019, Vol. 55 Issue (11): 1395-1406    DOI: 10.11900/0412.1961.2018.00555
  研究论文 本期目录 | 过刊浏览 |
Zn添加对预时效态Al-Mg-Si-Cu合金自然时效和烘烤硬化性的影响
朱上1,李志辉1(),闫丽珍1,李锡武1,张永安1,熊柏青1,2
1. 有研工程技术研究院有限公司有色金属制备加工国家重点实验室 北京 101407
2. 有研科技集团有限公司 北京 100088
Effects of Zn Addition on the Natural Ageing Behavior and Bake Hardening Response of a Pre-Aged Al-Mg-Si-Cu Alloy
ZHU Shang1,LI Zhihui1(),YAN Lizhen1,LI Xiwu1,ZHANG Yongan1,XIONG Baiqing1,2
1. State Key Laboratory of Nonferrous Metals and Processes, GRINMAT Engineering Institute Co. , Ltd. , Beijing 101407, China
2. GRINM Group Co. , Ltd. , Beijing 100088, China
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摘要: 

以含Zn和不含Zn的2种Al-Mg-Si-Cu合金为研究对象,研究了Zn添加(0.64%,质量分数)对预时效态Al-Mg-Si-Cu合金的自然时效行为和烘烤硬化响应的影响,并利用三维原子探针(3DAP)技术揭示了相关微观机理。结果表明,含Zn合金在80 ℃下预时效15 min后的自然时效过程中原子团簇的Zn含量增加,原子团簇的稳定性改变,与不含Zn合金相比,含Zn合金原子团簇生长得更快。含Zn和不含Zn合金在预时效后的自然时效过程中屈服强度增加,含Zn合金因为具有更小的原子团簇间距和更大的原子团簇剪切模量,其屈服强度始终高于不含Zn合金。预时效后自然时效不同时间后在170 ℃下进行30 min模拟烤漆处理,原子团簇向GP区和β"相的转变随着自然时效时间的延长而减弱,因此含Zn和不含Zn合金的烘烤屈服强度降低。Al基体中的Zn具有促进析出相转变的作用,因此含Zn合金的烘烤屈服强度始终高于不含Zn合金。

关键词 Al-Mg-Si-Cu合金时效Zn添加析出相    
Abstract

Al-Mg-Si(-Cu) alloys are widely used in automotive body panels because of their excellent combined performance of high strength-to-weight ratio, good formability and corrosion resistance. Zn additions to Al-Mg-Si(-Cu) alloys have been tested and shown to effectively affect the precipitation microstructure and enhance the age-hardening response. The present study investigates the natural ageing (NA) behavior and bake hardening response in the pre-aged Al-0.9Mg-0.8Si-0.2Cu (mass fraction, %) and Al-0.9Mg-0.8Si-0.2Cu-0.6Zn (mass fraction, %) alloys. The results are compared to clarify the effect of Zn addition. During NA after pre-ageing at 80 ℃ for 15 min (PA), cluster growth is the dominant process in the Zn-free and Zn-added alloys. Some Zn atoms are partitioned into the clusters under PA+NA condition. Partitioning of Zn may change the stability of clusters, increasing the growth rate of clusters. The yield strength of the two alloys increases with the increasing NA time. The smaller cluster spacing and larger cluster shear modulus lead to the higher yield strength in the Zn-added alloy during NA after PA. The prolonged NA inhibits the transformation of clusters to GP zones and β″ phases during bake hardening (BH) treatment at 170 ℃ for 30 min in the Zn-free and Zn-added alloys, resulting in the lower BH response. The Zn does not significantly partition into clusters or precipitates, and the majority of Zn remains in the Al matrix during BH treatment, prompting the transformation from solute clusters to GP zones and β″ phases. As a result, the yield strength of the Zn-added alloy after PA+NA+BH treatment is higher than that of the Zn-free alloy.

Key wordsAl-Mg-Si-Cu alloy    ageing    Zn addition    precipitate
收稿日期: 2018-12-19     
ZTFLH:  TG146.21  
基金资助:国家重点研发计划项目No(2016YFB0300802)
通讯作者: 李志辉     E-mail: lzh@grinm.com
Corresponding author: Zhihui LI     E-mail: lzh@grinm.com
作者简介: 朱上,男,1989年生,博士生

引用本文:

朱上,李志辉,闫丽珍,李锡武,张永安,熊柏青. Zn添加对预时效态Al-Mg-Si-Cu合金自然时效和烘烤硬化性的影响[J]. 金属学报, 2019, 55(11): 1395-1406.
Shang ZHU, Zhihui LI, Lizhen YAN, Xiwu LI, Yongan ZHANG, Baiqing XIONG. Effects of Zn Addition on the Natural Ageing Behavior and Bake Hardening Response of a Pre-Aged Al-Mg-Si-Cu Alloy. Acta Metall Sin, 2019, 55(11): 1395-1406.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00555      或      https://www.ams.org.cn/CN/Y2019/V55/I11/1395

AlloyMgSiZnCuMnZrFeAl
Zn-free0.900.820.0060.230.110.09<0.1Bal.
Zn-added0.920.780.6400.230.100.12<0.1Bal.
表1  不含Zn和含Zn的Al-Mg-Si-Cu合金的化学成分 (mass fraction / %)
图1  热处理过程示意图
图2  预时效态不含Zn和含Zn合金在自然时效和后续烘烤过程中显微硬度的变化曲线

Treatment

Zn-free alloyZn-added alloy
YS / MPaUTS / MPaA50 / %YS / MPaUTS / MPaA50 / %
PA+NA 2 d12724424.513224925.2
PA+NA 120 d13925725.014526625.5
PA+NA 2 d+BH17928522.119429821.5
PA+NA 120 d+BH16427324.817327823.9
表2  预时效态不含Zn和含Zn合金在自然时效和后续烘烤过程中的拉伸性能
图3  预时效态不含Zn和含Zn合金自然时效不同时间后析出相的3DAP形貌
图4  预时效态不含Zn和含Zn合金自然时效不同时间后对应烘烤状态下析出相的3DAP形貌
图5  不同时效条件下不含Zn和含Zn合金中析出相尺寸与形状的关系
图6  预时效态不含Zn和含Zn合金在自然时效和后续烘烤过程中的析出相数量密度
图7  预时效态不含Zn和含Zn合金在自然时效和后续烘烤条件下析出相(原子团簇、GP区和β″相)中的溶质原子分数
AlloyAgeing treatmentPrecipitate typeYield strength / MPa

Zn-free

PA+NA 2 dCluser33.6
PA+NA 120 dCluser36.9

Zn-added

PA+NA 2 dCluser40.7
PA+NA 120 dCluser47.4
表3  预时效态不含Zn和含Zn合金在自然时效条件下的屈服强度计算值
AlloyAgeing treatmentPrecipitate typeYield strength / MPa
Zn-freePA+NA 2 d+BHCluser28.6
GP zone15.9
PA+NA 120 d+BHCluser34.3
GP zone7.9
Zn-addedPA+NA 2 d+BHCluster32.1
GP zone21.8
β41.5
PA+NA 120 d+BHCluster46.4
GP zone15.7
β19.5
表4  预时效态不含Zn和含Zn合金自然时效不同时间对应的烘烤态屈服强度计算值
AlloyAgeing treatmentAverage radius / nmMg/Si ratioMg/Zn ratio
Zn-freePA+NA 2 d1.031.12-
PA+NA 120 d1.051.04-
Zn-addedPA+NA 2 d1.081.236.17
PA+NA 120 d1.131.133.22
表5  预时效后自然时效过程中不含Zn和含Zn合金中原子团簇的尺寸、Mg/Si原子比变化以及含Zn合金中原子团簇Mg/Zn原子比变化
图8  预时效态不含Zn和含Zn合金在自然时效和烘烤过程中的析出相演变的示意图
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