预变形对超高强<strong>Al-Zn-Mg-Cu</strong>合金时效组织与力学性能的影响

doi:10.11900/0412.1961.2019.00402

金属学报

2020, Vol. 56

Issue (7): 1007-1014 DOI: 10.11900/0412.1961.2019.00402

本期目录 | 过刊浏览

预变形对超高强Al-Zn-Mg-Cu合金时效组织与力学性能的影响

韩宝帅¹, 魏立军¹^,², 徐严谨¹(

), 马晓光¹, 刘雅菲¹, 侯红亮¹

1.中国航空制造技术研究院北京 100024
2.北京航空航天大学材料科学与工程学院北京 100083

Effect of Pre-Deformation on Microstructure and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy After Ageing Treatment

HAN Baoshuai¹, WEI Lijun¹^,², XU Yanjin¹(

), MA Xiaoguang¹, LIU Yafei¹, HOU Hongliang¹

1. AVIC Manufacturing Technology Institute, Beijing 100024, China
2. School of Materials Science and Engineering, Beihang University, Beijing 100083, China

引用本文:

韩宝帅, 魏立军, 徐严谨, 马晓光, 刘雅菲, 侯红亮. 预变形对超高强Al-Zn-Mg-Cu合金时效组织与力学性能的影响[J]. 金属学报, 2020, 56(7): 1007-1014.
Baoshuai HAN, Lijun WEI, Yanjin XU, Xiaoguang MA, Yafei LIU, Hongliang HOU. Effect of Pre-Deformation on Microstructure and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy After Ageing Treatment[J]. Acta Metall Sin, 2020, 56(7): 1007-1014.

全文: PDF(2794 KB) HTML

摘要:

利用TEM、XRD、SEM、DSC以及室温拉伸等方法，研究了预变形对超高强Al-Zn-Mg-Cu合金组织与性能的影响。通过对比未经预变形和预变形量为3%及4%的Al-Zn-Mg-Cu合金时效态微观组织与拉伸力学性能，发现：预变形可以提高铝合金时效析出速率和密度，变形量为3%时可促进析出相在晶内弥散分布，但增加到4%会导致析出相粗化；经预变形处理后晶间析出相尺寸减小，晶界无析出带宽度降低；抗拉强度和屈服强度提高，伸长率略微提高，经3%预变形以及80 ℃、12 h和120 ℃、8 h时效后的抗拉强度可达到(813±4) MPa，伸长率为10.10%±0.77%。分析认为，预变形产生的位错为析出相形核提供了异质形核的质点，改善了其在晶内与晶间的分布状态。

关键词 ：超高强铝合金, 预变形, 析出相, 晶间无析出带, 力学性能

Abstract：

Ultra-high strength Al-Zn-Mg-Cu alloy is a promising lightweight structural material, and there is still room to improve its mechanical property. As a typical precipitation strengthening material, controlling the size and distribution of precipitate is an effective way to enhance the mechanical properties of the ultra-high strength Al-Zn-Mg-Cu alloy. The influence of pre-deformation on the microstructures and properties of the ultra-high strength Al-Zn-Mg-Cu alloy after ageing treatment was studied by TEM, XRD, SEM, DSC and tensile tests. The microstructures and the tensile mechanical properties of Al-Zn-Mg-Cu alloy without pre-deformation and with 3% and 4% pre-deformation were compared. It is found that the pre-deformation can promote the ageing precipitation rate and enhance the precipitate density in the Al-Zn-Mg-Cu alloy, and the pre-deformation ratio of 3% can promote the dispersion of the precipitate phase in the grain interiors, but the pre-deformation ratio of 4% may result in coarsening of precipitate. The size of precipitate along the grain boundaries and the width of precipitation free zones decreased in the pre-deformation treated ultra-high strength Al-Zn-Mg-Cu alloys. The tensile strength and yield strength of the pre-deformation treated ultra-high strength Al-Zn-Mg-Cu alloys increased, and the elongation also increased slightly, in which the tensile strength and elongation of 3% pre-deformation alloy combined with 80 ℃ for 12 h and 120 ℃ for 8 h ageing were (813±4) MPa and 10.10%±0.77%, respectively. The results show that the dislocations produced by pre-deformation may provide more heterogeneous nucleation sites for the precipitate formation, and improve the precipitate's distribution.

Key words： ultra-high strength Al alloy pre-deformation precipitate precipitation free zone mechanical property

收稿日期: 2019-11-25

ZTFLH:

TG379

基金资助:国防基础科研项目(JCKY2017205B032);国家自然科学基金项目(51971206)

作者简介: 韩宝帅，男，1985年生，工程师，博士

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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00402 或 https://www.ams.org.cn/CN/Y2020/V56/I7/1007

表1 时效工艺参数

图1 不同变形量下固溶态Al-Zn-Mg-Cu合金的XRD谱

图2 不同时效条件下超高强Al-Zn-Mg-Cu合金的微观组织

图3 不同时效状态下超高强Al-Zn-Mg-Cu合金晶间析出相形貌

表2 不同时效状态下超高强Al-Zn-Mg-Cu合金的力学性能

图4 不同热处理状态下超高强Al-Zn-Mg-Cu合金的断口形貌

图5 不同时效状态下超高强Al-Zn-Mg-Cu合金的DSC曲线

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