挤压复合铸造7075/6061双金属铸锭的界面组织与性能

doi:10.13251/j.issn.0254-6051.2021.06.036

金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 186-190.DOI: 10.13251/j.issn.0254-6051.2021.06.036

挤压复合铸造7075/6061双金属铸锭的界面组织与性能

郑小平¹, 谢文杰¹, 曹通¹, 肖广耀², 田亚强¹, 陈连生¹

1.华北理工大学教育部现代冶金技术重点实验室, 河北唐山 063210;
2.唐山中厚板材有限公司, 河北唐山 063600

收稿日期:2021-01-19 出版日期:2021-06-25 发布日期:2021-07-21
作者简介:郑小平(1978—),男,副教授,博士,硕士生导师,主要研究方向为金属基复合材料制备及界面表征、合金元素扩散热力学与动力学等,E-mail:zhengxp1978@163.com。
基金资助:
国家自然科学基金(51474091);河北省高等学校科学技术研究项目(ZD2018242)

Interface microstructure and properties of 7075/6061 bimetallic ingot prepared by squeeze composite casting

Zheng Xiaoping¹, Xie Wenjie¹, Cao Tong¹, Xiao Guangyao², Tian Yaqiang¹, Chen Liansheng¹

1. Key Laboratory of Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan Hebei 063210, China;
2. Tangshan Nedium Thick Plate Co., Ltd., Tangshan Hebei 063600, China

Received:2021-01-19 Online:2021-06-25 Published:2021-07-21

摘要/Abstract

摘要： 采用挤压复合铸造工艺制备出具有“半固态组织/枝晶组织”分布特征的7075/6061包覆型双金属复合铸锭,并对复合铸锭界面处的组织及硬度进行了分析。结果表明,界面结合良好,为冶金结合,无杂质和氧化皮存在。界面处组织过渡平缓,7075铝合金固相颗粒呈一定规律性分布;除Zn元素浓度呈明显梯度变化外,其它合金元素分布较均匀。界面大部分由较细小等轴晶组成,且有大量合金元素沉积在晶界处,致使界面处硬度高于两侧金属,硬度最高达63.3 HRB。

关键词: 复合铸造, 7075铝合金, 6061铝合金, 组织, 元素分布, 硬度

Abstract: A 7075/6061 clad bimetal composite ingot with “semi-solid structure/dendrite” distribution characteristics was prepared by squeeze composite casting technology, and the microstructure and hardness at the interface of the composite ingot were analyzed. The results show that the interface bonding is good as metallurgical bonding with no impurity and oxide scale. The transition of microstructure at the interface is smooth, and the solid particles of 7075 aluminum alloy distribute regularly; the distribution of alloy elements except for Zn is uniform. Most of the interface microstructure is composed of fine equiaxed grains, with a large quantity of alloy elements depositing at the grain boundary, resulting in the hardness of the interface higher than that on both sides, with the highest hardness of 63.3 HRB.

Key words: composite casting, 7075 aluminum alloy, 6061 aluminum alloy, microstructure, element distribution, hardness

中图分类号:

TB331
TG146

郑小平, 谢文杰, 曹通, 肖广耀, 田亚强, 陈连生. 挤压复合铸造7075/6061双金属铸锭的界面组织与性能[J]. 金属热处理, 2021, 46(6): 186-190.

Zheng Xiaoping, Xie Wenjie, Cao Tong, Xiao Guangyao, Tian Yaqiang, Chen Liansheng. Interface microstructure and properties of 7075/6061 bimetallic ingot prepared by squeeze composite casting[J]. Heat Treatment of Metals, 2021, 46(6): 186-190.

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挤压复合铸造7075/6061双金属铸锭的界面组织与性能

Interface microstructure and properties of 7075/6061 bimetallic ingot prepared by squeeze composite casting

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