单级时效工艺对7075铝合金包覆薄板力学性能的影响

材料导报

2021, Vol. 35

Issue (Z1): 411-413

金属与金属基复合材料

单级时效工艺对7075铝合金包覆薄板力学性能的影响

于芳^1,2, 晁代义^1,3, 邢雷¹, 王欣¹, 黄同瑊¹, 王向杰²

1 山东南山铝业股份有限公司,国家铝合金压力加工工程技术研究中心, 龙口 265713
2 东北大学材料科学与工程学院,沈阳 110819
3 山东南山科学技术研究院有限公司, 龙口 265713

Effect of Single-stage Aging Treatment on Tensile Properties of 7075 Aluminum Alloy Coated Sheet

YU Fang^1,2, CHAO Daiyi^1,3, XING Lei¹, WANG Xin¹, HUANG Tongjian¹, WANG Xiangjie²

1 National Engineering Research Center for Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co., Ltd., Longkou 265713, China
2 College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3 Shandong Nanshan Institute of Science and Technology Co., Ltd., Longkou 265713, China

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摘要为了解决大飞机蒙皮用7075铝合金薄板T6态性能要求。本工作采用室温拉伸试验、金相及扫描电镜研究了工业化生产的7075薄板前铸锭的均热效果,单级时效工艺对7075薄板的力学性能的影响规律。结果表明合金铸锭经均匀化处理后,主要残留含Fe相,共晶组织基本消除。铸锭经热轧、冷轧至2.5 mm,固溶后薄板的晶粒呈拉长状态,再结晶程度达到80%。单级时效结果表明:随着时效时间的延长,7075薄板L和LT向的抗拉强度、屈服强度不断增加,延伸率有所降低,选择121 ℃/36 h作为7075薄板T6态时效制度,此时L和LT向抗拉强度分别为531 MPa和520.5 MPa,屈服强度分别为448.5 MPa和440.5 MPa,延伸率分别为15.5%和14.8%。

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关键词: 7075铝合金薄板 T6 抗拉强度

Abstract: In order to meet the performance requirements of 7075 aluminum alloy coated sheet T6 aging for large aircraft skin. In this paper, the homo-genization effect and the effect of single stage aging process on the mechanical properties of 7075 thin plate were studied by means of room temperature tensile test, OM and SEM. The results showed that Fe - containing phase remained and eutectic structure was basically eliminated after homogenization. After hot rolling, cold rolling to 2.5 mm and then solution treatment, the grains of the plate were elongated and the recrystallization degree reached 80%. The single-stage aging results show, that with the increase of aging time, the tensile strength and yield strength in the L and LT directions of 7075 thin plate increase continuously, while the elongation decreases. At 121 ℃/36 h, the T6 state aging system of 7075 thin plate is selected. At this time, the tensile strength in the L and LT directions are 531 MPa and 520.5 MPa, respectively; the yield strength is 448.5 MPa and 440.5 MPa, and the elongation is 15.5% and 14.8%, respectively.

Key words: 7075 aluminum alloy thin plate T6 stage tensile strength

发布日期: 2021-07-16

ZTFLH:

TG142.71

基金资助: 国家新材料生产应用示范平台;国家自然科学基金(U1708251);辽宁省重点研发计划(2020JH2/10700003);兴辽计划(XLYC1807027)

通讯作者: cdy19861226@163.com

作者简介: 于芳,2013年7月获得材料加工工程硕士学位,目前为东北大学在读博士,工程师,主要从事航空用铝合金组织与性能研究,参与编写国家标准多项,并获得中国有色金属协会二等奖。晁代义,2013年6月毕业于烟台大学,获得工学硕士学位。2013年9月到2017年3月于哈尔滨工业大学材料学院攻读博士学位。目前就职于山东南山科学技术研究院,发表学术论文20余篇。主要从事高强铝合金热处理及变形工艺研究以及金属材料失效分析。目前担任中国机械工程协会失效分析分会失效分析专家。

引用本文:

于芳, 晁代义, 邢雷, 王欣, 黄同瑊, 王向杰. 单级时效工艺对7075铝合金包覆薄板力学性能的影响[J]. 材料导报, 2021, 35(Z1): 411-413.
YU Fang, CHAO Daiyi, XING Lei, WANG Xin, HUANG Tongjian, WANG Xiangjie. Effect of Single-stage Aging Treatment on Tensile Properties of 7075 Aluminum Alloy Coated Sheet. Materials Reports, 2021, 35(Z1): 411-413.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2021/V35/IZ1/411

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