添加Sc对7055铝合金微观结构和力学性能的影响

doi:10.11901/1005.3093.2017.233

材料研究学报

2018, Vol. 32

Issue (2): 112-118 DOI: 10.11901/1005.3093.2017.233

研究论文

本期目录 | 过刊浏览

添加Sc对7055铝合金微观结构和力学性能的影响

滕广标¹, 刘崇宇¹(

), 李剑², 马宗义³(

), 周文标², 向晶²

1 桂林理工大学广西有色金属及特色材料加工教育部重点实验室桂林 541004
2 广西南南铝加工有限公司南宁 530031
3 中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳 110016

Effect of Sc on Microstructure and Mechanical Property of 7055 Al-alloy

Guangbiao TENG¹, Chongyu LIU¹(

), Jian LI², Zongyi MA³(

), Wenbiao ZHOU², Jing XIANG²

1 Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education, Guilin University of Technology, Guilin 541004, China;
2 Alnan Aluminium Co., Ltd., Nanning 530031, China
3 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

滕广标, 刘崇宇, 李剑, 马宗义, 周文标, 向晶. 添加Sc对7055铝合金微观结构和力学性能的影响[J]. 材料研究学报, 2018, 32(2): 112-118.
Guangbiao TENG, Chongyu LIU, Jian LI, Zongyi MA, Wenbiao ZHOU, Jing XIANG. Effect of Sc on Microstructure and Mechanical Property of 7055 Al-alloy[J]. Chinese Journal of Materials Research, 2018, 32(2): 112-118.

全文: PDF(1871 KB) HTML

摘要:

研究了添加Sc元素对7055铝合金铸造、均匀化处理、轧制和固溶时效过程的微观结构演化以及力学性能的影响。结果表明,向7055溶液中添加质量分数为0.25%的Sc导致在铸造过程中形成初生Al₃(Sc,Zr)相。这个相能促使合金发生非均质形核,显著细化合金的铸造组织。在7055-Sc铝合金的均匀化处理过程中析出高密度纳米Al₃(Sc, Zr)相,不但能抑制晶粒粗化,而且在后期轧制变形和固溶时效处理过程中还起钉扎晶界、抑制回复与再结晶、保留纤维组织的作用。与7055铝合金相比,7055-Sc铝合金的晶粒尺寸更小,因此具有更有效的细晶强化效应。添加Sc的时效处理态7055铝合金的最大抗拉强度和显微硬度,分别提高到642 MPa和218 HV。

关键词 ：金属材料, 轧制变形, 热处理, 力学性能, 微观组织, 铝合金

Abstract：

The effect of Sc addition on the microstructure and mechanical properties of 7055 Al-alloy as-cast, as well as after homogenization-, rolling-, solution- and aging-treatment was investigated. The addition of 0.25%(mass fraction) Sc could lead to the formation of Al₃(Sc, Zr) phase, which can promote the heterogeneous nucleation during casting. Therefore, the microstructure of the as cast 7055 Al-alloy was refined. The precipitation of nano-sized Al₃(Sc, Zr) phase occurred during the homogenization treatment of the 7055-Sc Al-alloy, and this nano-sized Al₃( Sc, Zr) phase could effectively inhibit the coarsening of Al grains during homogenization treatment, and play a role in pinning the grain boundaries, therewith inhibiting the recovery and recrystallization, thus retaining the fiber-like structure during subsequent rolling and solution treatments. Compared to the plain 7055 Al-alloy, the 7055-Sc Al alloy exhibited much higher fine grain strengthening effect due to finer grain size and showed higher tensile strength and hardness as high as 642 MPa and 218 HV, respectively.

Key words： metallic materials rolling heat treatments mechanical properties microstructure Al alloys

收稿日期: 2017-04-05

ZTFLH:

TG146.2

基金资助:国家自然科学基金(51601045),广西重点研发计划(桂科AB16380021),广西八桂学者创新团队项目

作者简介:

作者简介滕广标,男,1994年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.233 或 https://www.cjmr.org/CN/Y2018/V32/I2/112

图1 铸态AA 7055和7055-Sc合金的OM照片

图2 铸态7055-Sc合金的SEM和能谱元素分布照片

图3 均匀化处理后7055和7055-Sc合金的OM照片

图4 均匀化处理后7055-Sc合金的SEM及能谱元素分布

图5 均匀化处理后7055和7055-Sc合金的TEM照片(箭头为Al3(Sc, Zr)相的(110)及(001))

图6 轧制态7055和7055-Sc合金的OM照片

图7 固溶时效态7055和7055-Sc合金的OM照片

图8 固溶时效态7055合金和7055-Sc合金的低倍和高倍TEM照片

表1 固溶时效后7055和7055-Sc合金的力学性能

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