Cu含量对重力铸造Al-Cu-Mg-Sc合金组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.05.008

金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 53-58.DOI: 10.13251/j.issn.0254-6051.2022.05.008

Cu含量对重力铸造Al-Cu-Mg-Sc合金组织及力学性能的影响

郑元凯^1,2, 李龙飞², 金康³, 李春明², 张文良¹, 梁君宁⁴

1.北京机电研究所有限公司, 北京 100083;
2.北京机科国创轻量化科学研究院有限公司, 北京 100083;
3.中机精密成形产业技术研究院(安徽)股份有限公司, 安徽芜湖 241000;
4.河北丰维机械制造有限公司, 河北邢台 054500

收稿日期:2022-01-15 修回日期:2022-03-15 出版日期:2022-05-25 发布日期:2022-06-16
通讯作者: 李龙飞,工程师,博士,E-mail: lilongfei@camtc.com.cn
作者简介:郑元凯(1996—),男,硕士研究生,主要研究方向为铸造铝铜合金,E-mail: 13869168506@163.com。
基金资助:
先进成形技术与装备国家重点实验室开放课题(SKL2020006)

Influence of Cu content on microstructure and mechanical properties of Al-Cu-Mg-Sc alloy fabricated by gravity die casting

Zheng Yuankai^1,2, Li Longfei², Jin Kang³, Li Chunming², Zhang Wenliang¹, Liang Junning⁴

1. Beijing Research Institute of Mechanical and Electrical Technology Ltd., Beijing 100083, China;
2. Beijing National Innovation Institute of Lightweight Ltd., Beijing 100083, China;
3. China Machinery Industry Technology Research Institute of Precision Forming, Wuhu Anhui 241000, China;
4. Hebei Fengwei Machinery Co., Ltd., Xingtai Hebei 054500, China

Received:2022-01-15 Revised:2022-03-15 Online:2022-05-25 Published:2022-06-16

摘要/Abstract

摘要： 在重力铸造条件下制备了不同Cu含量(4%~6%,质量分数,下同)Al-Cu-Mg-Sc合金,采用500 ℃×4 h＋520 ℃×6 h的双级固溶,水冷后进行175 ℃×5 h时效。通过维氏硬度测试、室温拉伸性能测试试验、扫描电镜分析(SEM)等手段,研究了不同Cu含量对试验合金显微组织和力学性能的影响,进而优化Al-Cu-Mg-Sc铝合金成分。结果表明,经热处理后,随Cu含量从4.26%提高至5.58%,Al₂Cu析出相含量持续提高,热处理后合金屈服强度从191 MPa提升至216 MPa,抗拉强度从323 MPa提升至355 MPa,伸长率维持在13%附近。然而,当Cu含量较高时(6.13%),微观组织中Al₂Cu相体积分数较高,固溶后进入基体的Al₂Cu相数目有限,有大量Al₂Cu相残留在晶界处,经过时效处理后,合金的强化效果不能随Cu含量的增加而继续提升。因此整体上,随Cu含量提高,时效态高Cu含量合金的硬度和抗拉强度先增加随后趋于平稳,断后伸长率呈现先增加后降低的规律。Cu含量为5.58%的铸造Al-Cu-Mg-Sc铝合金时效后获得最佳综合性能,其硬度为117 HV,抗拉强度和屈服强度分别为355 MPa、216 MPa,断后伸长率为13.5%。

关键词: Al-Cu-Mg-Sc合金, Cu含量, 析出强化, 力学性能

Abstract: Al-Cu-Mg-Sc alloy with different Cu contents (4%-6%, mass fraction, similarly hereinafter) was prepared by gravity die casting process, and a two-stage solution treatment(500 ℃×4 h＋520 ℃×6 h) with water cooling was carried out, subsequently aged at 175 ℃ for 5 h.Effect of Cu content on microstructure and mechanical properties of the tested alloy was investigated by means of Vickers hardness test, room temperature tensile test, scan electron microscope observation. Then, the optimized composition of Al-Cu-Mg-Sc alloy was obtained. The results show that when the Cu content increases from 4.26% to 5.58%, the precipitation content of Al₂Cu phase increases continuously after heat treatment, and the yield strength and tensile strength of the alloy increase from 191 MPa and 323 MPa to 216 MPa and 355 MPa, respectively, and the elongation is maintained around 13%. While the Cu content is higher (6.13%), the volume fraction of Al₂Cu phase in the microstructure is relatively high, and the amount of Al₂Cu phases dissolved into the matrix after solution treatment is limited, and a large amount of residual Al₂Cu phases remain at the grain boundary. After aging, the strengthening effect of the high-Cu alloy cannot continue to increase as the Cu content increases. Therefore, on the whole, with the increase of Cu content, the hardness and tensile strength of the alloys with high Cu content increase firstly and then stabilize, the elongation of the alloys first increases and then decreases. The cast Al-Cu-Mg-Sc alloy with Cu content of 5.58% after aging can achieve the best overall properties, of which the hardness is 117 HV, tensile strength and yield strength are 355 MPa and 216 MPa, respectively, and the elongation is maintained in 13.5%.

Key words: Al-Cu-Mg-Sc alloy, Cu content, precipitation strengthening, mechanical properties

中图分类号:

TG146.2⁺1

郑元凯, 李龙飞, 金康, 李春明, 张文良, 梁君宁. Cu含量对重力铸造Al-Cu-Mg-Sc合金组织及力学性能的影响[J]. 金属热处理, 2022, 47(5): 53-58.

Zheng Yuankai, Li Longfei, Jin Kang, Li Chunming, Zhang Wenliang, Liang Junning. Influence of Cu content on microstructure and mechanical properties of Al-Cu-Mg-Sc alloy fabricated by gravity die casting[J]. Heat Treatment of Metals, 2022, 47(5): 53-58.

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Cu含量对重力铸造Al-Cu-Mg-Sc合金组织及力学性能的影响

Influence of Cu content on microstructure and mechanical properties of Al-Cu-Mg-Sc alloy fabricated by gravity die casting

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